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Literature Melting Point of Dibenzalacetone: A Comprehensive Guide
The seemingly simple question of "what is the melting point of dibenzalacetone?" reveals a fascinating complexity. Finding a single, definitive answer proves surprisingly challenging, highlighting the nuances of experimental chemistry and the importance of critically evaluating reported data. This post delves into the literature surrounding dibenzalacetone's melting point, exploring the factors influencing variations, providing a range of reported values, and guiding you toward a more informed understanding. We’ll analyze different sources, explain potential discrepancies, and ultimately equip you to confidently interpret melting point data for this common organic compound.
Understanding Dibenzalacetone and its Melting Point
Dibenzalacetone (DBA), also known as dibenzylideneacetone, is a yellowish crystalline solid often synthesized as a classic organic chemistry experiment. Its melting point serves as a crucial indicator of its purity. A pure sample melts sharply over a narrow temperature range, while impurities broaden the melting point range and lower the observed temperature. This is why consistent, accurate reporting of the melting point is essential for verifying the synthesis's success and the compound's identity.
Reported Melting Points in the Literature: A Range of Values
A quick search reveals a range of melting points reported for dibenzalacetone in the scientific literature. You'll find values ranging from 105°C to 115°C, sometimes even higher, depending on the source and experimental conditions. This variation underscores the critical need for context.
#### Factors Influencing Melting Point Variations
Several key factors contribute to this observed range of melting points:
Purity of the Sample: The most significant factor. Even trace impurities can drastically lower and broaden the melting point. The presence of starting materials (benzaldehyde, acetone) or side products significantly impacts the observed melting point.
Polymorphism: Dibenzalacetone can exist in different crystalline forms (polymorphs), each exhibiting a distinct melting point. The synthesis method and crystallization conditions can influence which polymorph is obtained.
Experimental Error: Variations in heating rate, thermometer calibration, and sample preparation techniques can all introduce error in melting point determination.
Solvent Residues: Incomplete drying after recrystallization can leave residual solvent trapped within the crystals, leading to a lower melting point.
Critically Evaluating Literature Data
When searching for the melting point of dibenzalacetone, it’s crucial to critically evaluate the source. Look for:
Reputable Journals: Peer-reviewed articles in established chemical journals generally provide more reliable data.
Detailed Experimental Procedures: A well-described synthesis and purification method increases confidence in the reported melting point.
Confirmation of Purity: The authors should clearly state how the purity of their dibenzalacetone sample was verified (e.g., using techniques like melting point determination itself, NMR spectroscopy, or TLC).
Multiple Data Points: A single reported melting point is less reliable than multiple measurements from independent experiments.
Practical Implications and Best Practices
Knowing the range of possible melting points is vital for organic chemistry students and researchers. A value outside the typical range (105-115°C) often indicates impurities requiring further purification. The best practice is to carefully record your own experimental melting point alongside a detailed description of the experimental procedure and purification techniques.
Conclusion
The literature melting point of dibenzalacetone isn't a single, fixed number. The range of values reflects the influence of several factors, primarily the purity of the sample and experimental conditions. By understanding these contributing factors and critically evaluating reported data, you can better interpret melting point results and confidently assess the quality of your dibenzalacetone synthesis. Remember that your own experimentally determined melting point, along with thorough characterization, provides the most reliable data for your specific sample.
FAQs
1. What is the most commonly reported melting point for dibenzalacetone? While there’s a range, values between 108°C and 112°C are frequently reported in the literature.
2. Why is my dibenzalacetone's melting point lower than expected? Impurities are the most likely culprit. Recrystallization is often necessary to purify the sample.
3. Can the melting point of dibenzalacetone be used to confirm its identity? While it's a helpful indicator, it should be combined with other characterization techniques (e.g., NMR, IR spectroscopy) for definitive identification.
4. How can I improve the accuracy of my melting point determination? Use a calibrated thermometer, a slow heating rate, and a small, finely powdered sample.
5. What other factors besides purity affect the melting point besides the ones already mentioned? The rate of heating during the experiment and the quality of the melting point apparatus itself can also subtly influence the observed melting point.
| literature melting point of dibenzalacetone: Comprehensive Organic Chemistry Experiments for the Laboratory Classroom Carlos A. M. Afonso, Nuno R. Candeias, Dulce Pereira Simão, Alexandre F. Trindade, Jaime A. S. Coelho, Bin Tan, Robert Franzén, 2016-12-16 This expansive and practical textbook contains organic chemistry experiments for teaching in the laboratory at the undergraduate level covering a range of functional group transformations and key organic reactions.The editorial team have collected contributions from around the world and standardized them for publication. Each experiment will explore a modern chemistry scenario, such as: sustainable chemistry; application in the pharmaceutical industry; catalysis and material sciences, to name a few. All the experiments will be complemented with a set of questions to challenge the students and a section for the instructors, concerning the results obtained and advice on getting the best outcome from the experiment. A section covering practical aspects with tips and advice for the instructors, together with the results obtained in the laboratory by students, has been compiled for each experiment. Targeted at professors and lecturers in chemistry, this useful text will provide up to date experiments putting the science into context for the students. |
| literature melting point of dibenzalacetone: Journal of General Chemistry of the U.S.S.R. in English Translation , 1963 |
| literature melting point of dibenzalacetone: Comprehensive Organic Chemistry Experiments for the Laboratory Classroom Carlos A M Afonso, Nuno R Candeias, Dulce Pereira Simão, Alexandre F Trindade, Jaime A S Coelho, Bin Tan, Robert Franzén, 2020-08-28 This expansive and practical textbook contains organic chemistry experiments for teaching in the laboratory at the undergraduate level covering a range of functional group transformations and key organic reactions.The editorial team have collected contributions from around the world and standardized them for publication. Each experiment will explore a modern chemistry scenario, such as: sustainable chemistry; application in the pharmaceutical industry; catalysis and material sciences, to name a few. All the experiments will be complemented with a set of questions to challenge the students and a section for the instructors, concerning the results obtained and advice on getting the best outcome from the experiment. A section covering practical aspects with tips and advice for the instructors, together with the results obtained in the laboratory by students, has been compiled for each experiment. Targeted at professors and lecturers in chemistry, this useful text will provide up to date experiments putting the science into context for the students. |
| literature melting point of dibenzalacetone: Microscale Organic Laboratory Dana W. Mayo, Ronald M. Pike, David C. Forbes, 2010-01-12 This is a laboratory text for the mainstream organic chemistry course taught at both two and four year schools, featuring both microscale experiments and options for scaling up appropriate experiments for use in the macroscale lab. It provides complete coverage of organic laboratory experiments and techniques with a strong emphasis on modern laboratory instrumentation, a sharp focus on safety in the lab, excellent pre- and post-lab exercises, and multi-step experiments. Notable enhancements to this new edition include inquiry-driven experimentation, validation of the purification process, and the implementation of greener processes (including microwave use) to perform traditional experimentation. |
| literature melting point of dibenzalacetone: Soviet Research in Boron Chemistry, 1949-1956 Consultants Bureau Enterprises, 1960 |
| literature melting point of dibenzalacetone: Unitized Experiments in Organic Chemistry Ray Quincy Brewster, Calvin Anthony VanderWerf, William Edwin McEwen, 1977 |
| literature melting point of dibenzalacetone: Macroscale and Microscale Organic Experiments Kenneth L. Williamson, 1999 |
| literature melting point of dibenzalacetone: Purification of Laboratory Chemicals W.L.F. Armarego, 2003-03-07 Now in its fifth edition, the book has been updated to include more detailed descriptions of new or more commonly used techniques since the last edition as well as remove those that are no longer used, procedures which have been developed recently, ionization constants (pKa values) and also more detail about the trivial names of compounds.In addition to having two general chapters on purification procedures, this book provides details of the physical properties and purification procedures, taken from literature, of a very extensive number of organic, inorganic and biochemical compounds which are commercially available. This is the only complete source that covers the purification of laboratory chemicals that are commercially available in this manner and format.* Complete update of this valuable, well-known reference* Provides purification procedures of commercially available chemicals and biochemicals* Includes an extremely useful compilation of ionisation constants |
| literature melting point of dibenzalacetone: Detection and Identification of Organic Compounds Miroslov Vecera, 2012-12-06 The American edition of our monograph is not a mere translation of the Czech edition, which appeared some five years ago. We have had to respect the fact that even such a short period has sufficed for progress in this field, and that the field of application of methods of organic analysis has widened. We have therefore revised a number of chapters in Part 1, the general part of the monograph-mainly those devoted to chromatographic methods, which have been extended and complemented by methods of thin-layer chromatography and electrophoresis. The chapters on the theory of color reactions and on analytical literature have also been extended; the chapter on spectral methods has been extended by including the use of proton magnetic resonance in organic analysis, and the list of references has been enlarged by adding books of importance for organic analysis. In Part 2, the part dealing specifically with various elements and chemical groups, we have extended the chapters on solubility and on acids and bases. The methods for the detection and identification of given classes of compounds have also been supplemented by references to recent papers. |
| literature melting point of dibenzalacetone: Microwave Assisted Organic Synthesis Jason Tierney, Pelle Lidström, 2009-02-12 The first reports on the application of microwaves in organicsynthesis date back to 1986, but it was not until the recentintroduction of specifically designed and constructed equipment,which countered the safety and reproducibility concerns, thatsynthetic application of microwaves has become established as alaboratory technique. Microwave assisted synthesis is now beingadopted in many industrial and academic laboratories to takeadvantage of the novel chemistry that can be carried out using avariety of organic reaction types. This book demonstrates the underlying principles of microwavedielectric heating and, by reference to a range of organic reactiontypes, it's effective use in synthetic organic chemistry. Toillustrate the impact microwave assisted organic synthesis can haveon chemical research, case studies drawn mainly from thepharmaceutical industry are presented. |
| literature melting point of dibenzalacetone: Abstracts of Papers New York International Congress of Pure and Applied Chemistry. 12th, 1951 |
| literature melting point of dibenzalacetone: The Aldol Condensation L. G. Wade, Jr., 1998-02-01 |
| literature melting point of dibenzalacetone: Abstracts of papers International Congress of Pure and Applied Chemistry, 12th (New York, 1951), 1951 |
| literature melting point of dibenzalacetone: Journal of the American Chemical Society American Chemical Society, 1951 |
| literature melting point of dibenzalacetone: Organic Experiments Kenneth L. Williamson, Katherine M. Masters, 2010-07-11 The market leader for the full-year organic laboratory, this manual derives many experiments and procedures from the classic Feiser lab text, giving it an unsurpassed reputation for solid, authoritative content. The Sixth Edition includes new experiments that stress greener chemistry, as well as updated NMR spectra and a Premium Website that includes glassware-specific videos with pre-lab, gradable exercises. Offering a flexible mix of macroscale and microscale options for most experiments, this proven manual emphasizes safety and allows instructors to save on the purchase and disposal of expensive, sometimes hazardous, organic chemicals. Macroscale versions can be used for less costly experiments, allowing students to get experience working with conventionally-sized glassware. |
| literature melting point of dibenzalacetone: Journal of Applied Chemistry of the USSR. , 1961 |
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| literature melting point of dibenzalacetone: Journal of Organic Chemistry of the USSR. , 1968 |
| literature melting point of dibenzalacetone: Organic Chemistry with Vernier Elaine Y. Nam, Melissa P. Hill, Jack Randall, 2020-09 |
| literature melting point of dibenzalacetone: Synthetic Methods of Organometallic and Inorganic Chemistry Wolfgang A. Herrmann, 1996 |
| literature melting point of dibenzalacetone: Aluminium and Its Congeners H. F. V. Little, 1917 |
| literature melting point of dibenzalacetone: Safety in academic chemistry laboratories Jay A. Young, 2003 This book contains volume 1 of 2 and describes safety guidelines for academic chemistry laboratories to prevent accidents for college and university students. Contents include: (1) Your Responsibility for Accident Prevention; (2) Guide to Chemical Hazards; (3) Recommended Laboratory Techniques; and (4) Safety Equipment and Emergency Procedures. Appendices include the Web as a source of safety information and incompatible chemicals. |
| literature melting point of dibenzalacetone: Transactions of the American Institute of Chemical Engineers American Institute of Chemical Engineers, 1944 |
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| literature melting point of dibenzalacetone: Microscale Organic Laboratory Dana W. Mayo, Ronald M. Pike, Peter K. Trumper, 1994-05-06 This updated revision offers total coverage of organic laboratory experiments and techniques focusing on modern laboratory instrumentation, a strong emphasis on lab safety, additional concentration on sequential reaction sequences, excellent pre- and post-lab exercises, and multistep experiments which maximize the number of manipulations students perform per lab period. The microscale approach is low in cost, offers ease of doing experiments and uses minimal amounts of chemicals. A number of experiments include instructions for scaling up. |
| literature melting point of dibenzalacetone: Reactive Intermediates Leonardo S. Santos, 2009-11-04 During the last two decades there has been considerable growth in the development of electrospray ionization mass spectrometry (ESI-MS) as a practical method in the study of reaction mechanisms. This method allows the interception and characterization of key intermediates, either as transient species or as protonated/deprotonated forms of neutral species by API-MS. The outstanding features and advantages of ESI-MS make it one of the most suitable tools for the fast screening of intermediates directly from solution, providing hitherto unavailable chemical information to organic chemists. This monograph provides an overview of the mechanisms involved in ESI-MS, the historical perspectives before looking further in-depth at specific reactions and intermediates. Written by researchers in the field, this book is an unique resource for the understanding of this cutting-edge technique. |
| literature melting point of dibenzalacetone: Handbook of Tables for Organic Compound Identification Rappoport, 1998-05-01 Compounds are arranged according to functional group, with subarrangement in order of increasing melting point, boiling point, etc. Includes more than 8,100 parent compounds. Indexed. |
| literature melting point of dibenzalacetone: Drug Discovery for Leishmaniasis Luis Rivas, Carmen Gil, 2017-10-26 For human health, leishmaniasis is among the most important protozoan diseases, superseded only by malaria. Globally, 10 to 12 million people are infected with 1.5 million new cases every year. The development of cheaper new drugs is urgently needed for this neglected disease that is developing resistance to current treatments. Chemotherapy remains the only treatment option for the bulk of patients. However, this is largely unaffordable for most. In the past three years numerous advances in drug discovery have been made for treating this disease by exploiting diverging metabolic pathways between the Leishmania enzymes and their hosts, using nanotechnology to target the immune cell phagolysosomes where Leishmania resides. Drug Discovery for Leishmaniasis aims to provide a perspective of the current treatments and their challenges, blended with the emerging strategies and methodologies that will drive new target appraisals and drug developments, as well as addressing the molecular basis of resistance in Leishmania. Recent studies have shown that leishmaniasis affects some of the poorest people in the world, with 95% of fatal cases occurring in only 6 countries. With the WHO goal of eliminating this public health problem in the South-east Asia Region by 2020, this book will be important for anyone who is interested in neglected tropical diseases. |
| literature melting point of dibenzalacetone: Techniques and Experiments for Organic Chemistry Addison Ault, 1976 |
| literature melting point of dibenzalacetone: Applied Thin-Layer Chromatography Elke Hahn-Deinstrop, 2007-02-27 Thin-layer chromatography (TLC) is a powerful, fast and inexpensive analytical method. It has proven its usefulness in pharmaceutical, food and environmental analysis. This new edition of the practical TLC guide features a completely revised chapter on documentation, now including the use of digital cameras. Selected new sorbents and instruments are also introduced. Why has the prior edition been successful? All steps of the analytical procedure are clearly explained, starting with the choice of a suitable TLC technique and ending with data evaluation and documentation. Special emphasis is put on the proper choice of materials for TLC. Properties and functions of various materials and the TLC equipment are described, covering e. g. precoated layers, solvents and developing chambers, including information on suppliers. Many practical hints for trouble shooting are given. All this is illustrated with numerous coloured figures. How to use TLC in compliance with GLP/GMP regulations is described in detail, including the required documentation. Therefore the reader can very easily compile his own standard operating procedures. |
| literature melting point of dibenzalacetone: Vogel's Textbook of Practical Organic Chemistry Arthur I. Vogel, 1984 |
| literature melting point of dibenzalacetone: Calixarenes and Beyond Placido Neri, Jonathan L. Sessler, Mei-Xiang Wang, 2016-08-12 Contributions featuring the chemistry and applications of a family of macrocyclic compounds collectively known as 'calixarenes' are presented in this edited volume. The arsenal of structures based on calixarenes provides tools which are effective in numerous areas of supramolecular chemistry. The Editors have compiled a timely volume which contains up to date, high calibre contributions from a large number of international authors. A broad perspective on the progress and future of calixarene chemistry is presented. Aimed at students and researchers active in Supramolecular Chemistry. |
| literature melting point of dibenzalacetone: Macroscale and Microscale Organic Experiments Kenneth L. Williamson, 1999 This flexible, accurate manual includes both macroscale and microscale procedures for each experiment. The level and writing style of the text, which emphasizes biochemical and biomedical applications, make it ideally suited for the mainstream organic chemistry laboratory. A student CD-ROM includes videos and photos related to the material in the text. Videos feature the exact glassware required for each experiment and demonstrate techniques for how to conduct experiments successfully and safely. Photos show lab equipment set-ups. In this Experiment is a new feature that appears before every microscale experiment. It presents the objective of the experiment and keeps students from getting bogged down in the minute details of experimental procedures. An instructor web site provides a forum where instructors can communicate directly with the text author about specific experiments and the implementation of microscale techniques. The site also includes PDF files from the Instructor's Resource Manual. |
| literature melting point of dibenzalacetone: Isocyanide-based Multicomponent Reactions Jonathan G. Rudick, Alexander Dömling, Shabnam Shaabani, 2020-02-20 This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact. |
| literature melting point of dibenzalacetone: Organic Inhibitors of Corrosion of Metals Y.I. Kuznetsov, 2013-06-29 Organic Inhibitors of Corrosion of Metals provides a detailed review of the various theories advanced to explain the mechanisms of organic inhibitors. Author Yu.I. Kuznetsov explores the role of potential and charge of the metal, the nature of the organic species used as the inhibitor, and the function of the solvent. The author draws connections between these key elements and the processes of passivation, pitting, synergism, and complex formation. This unique volume brings together the mechanistic and practical aspects of corrosion control by organic inhibitors. |
| literature melting point of dibenzalacetone: Organic Reactions, Volume 7 , 1953-01-15 The volumes of Organic Reactions are collections of chapters each devoted to a single reaction, or a definite phase of a reaction, of wide applicability. The material is treated from a preparative viewpoint, with emphasis on limitations, interfering influences, effects of structure, and the selection of experimental techniques. Numerous detailed procedures illustrate the significant modifications of each method. Includes tables that contain all possible examples of the reaction under consideration. |
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| literature melting point of dibenzalacetone: Experiments in Green and Sustainable Chemistry Herbert W. Roesky, Dietmar Kennepohl, 2009-06-08 Encouraging a new attitude and approach to chemistry, this is the first such collection designed for lab courses and experimental teaching. Experts from around the globe present over 40 real-life teaching experiments, all clearly structured and divided into the five main principles of sustainable and green chemistry: catalysis, solvents, high yield and one-pot synthesis, limiting waste and exposure, as well as special topics. With a foreword by Nobel prize winner Jean Marie Lehn. |
| literature melting point of dibenzalacetone: Alkoxo and Aryloxo Derivatives of Metals Don Bradley, R. C. Mehrotra, Ian Rothwell, A. Singh, 2001-02-22 Alkoxo and Aryloxo Derivatives of Metals gives a comprehensive account of the chemistry of metal alkoxides and metal aryloxides, including their industrial applications such as microelectronics, ceramics, nonlinear optical materials, high-temperature superconductors, specialized glasses, and other advanced novel materials. It is an invaluable reference source book. The book is an updated edition of Metal Alkoxides, published by Academic Press in 1978, with additional coverage of metal aryloxides. It reflects the enormous growth in interest in this field in recent years. Alkoxo and aryloxo derivatives are organic compounds with metals for useful industrial purposes. Alkoxo and Aryloxo Derivatives of Metals will appeal to a wide-ranging audience, including university researchers and chemistry graduate students in industrial laboratories concerned with microelectronics, ceramics, glasses and other advanced novel materials; any laboratories doing research on nonlinear optical materials, high-temperature superconductors, ceramic materials, and specialized glasses. It can also serve as a supplementary text for final year courses in advanced inorganic chemistry, e.g., metallo-organic chemistry. |
| literature melting point of dibenzalacetone: Journal of Applied Chemistry , 1867 |
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Class-obtained melting points were used to create a melting point diagram of naphthalene and biphenyl. The eutectic point was estimated by extrapolation to be at 45 ... well to the literature …
Melting Point Range Of Dibenzalacetone - 45.79.9.118
2 is likely to result in the formation of … Synthesis of Dibenzalacetone - Troy University determine the melting point (literature value for dibenzalacetone is 110-112o C), and obtain an IR spectrum.
Literature Melting Point Of Dibenzalacetone - blog.welcu.com
Literature Melting Point Of Dibenzalacetone L. G. Wade, Jr. Journal of General Chemistry of the U.S.S.R. in English Translation ,1963 Comprehensive Organic Chemistry Experiments for the …
Literature Melting Point Of Dibenzalacetone
Literature Melting Point Of Dibenzalacetone New York International Congress of Pure and Applied Chemistry. 12th Journal of General Chemistry of the U.S.S.R. in English Translation ,1963 …
LABORATORY 1 Melting Points and Mixture Melting Points
Substance Observed Melting Point (oC) Literature Melting Point (oC) Naphthalene 79-80 80.5 p-anisic acid 178-182 184 3-chloro benzoic acid 157-158 158 Ferrocene 157.5-161.5 172.5 . …
Literature Melting Point Of Dibenzalacetone Full PDF
Literature Melting Point Of Dibenzalacetone: Journal of General Chemistry of the U.S.S.R. in English Translation ,1963 Comprehensive Organic Chemistry Experiments for the Laboratory Classroom …
Literature Melting Point Of Dibenzalacetone
literature-melting-point-of-dibenzalacetone 2 Downloaded from admissions.piedmont.edu on 2019-12-31 by guest specifically with various elements and chemical groups, we have extended the …
SYNTHESIS OF DIBENZALACETONE USING SONOCHEMISTRY …
College. The melting point of dibenzalacetone was determined using an electrothermal melting point apparatus. Nuclear Magnetic Resonance (NMR) spectroscopy and Gas Chromatography …
Literature Melting Point Of Dibenzalacetone - nees.jo
Literature Melting Point Of Dibenzalacetone New York International Congress of Pure and Applied Chemistry. 12th The Aldol Condensation L. G. Wade, Jr.,1998-02-01 A Practical Book of …
1 Assessment of the Ratio of Geometric Isomers of …
93 support the preparation of dibenzalacetone. The MS spectrum shown below represent the three different 94 geometric isomers with no difference in their fragmentation ions. 95 96 97 Fig. 1: …
