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Thiamine pyrophosphate (TPP) is a coenzyme derived from vitamin B1, also known as thiamine. Thiamine catalyzes the benzoin condensation in vitro in the absence of an enzyme. The mechanism of the thiamine-catalyzed benzoin condensation of benzaldehyde is shown in Figure 1 on the next page.
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www.cerlabs.com/experiments/10875407439.pdf
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Thiamine Catalyzed Benzoin Condensation; Adapted by Jon Landis and R. Minard (Penn State Univ.) from K. L. Williamson, Macroscale and Microscale Organic Experiments, 2nd Ed. 1994, Houghton Mifflin, Boston. Revised 2/22/02;
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courses.chem.psu.edu/chem35/Syn%20Sp06/35Exp12.pdf
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10 Synthesis of Dibenzalacetone by Aldol Condensation ... 12 Thiamine-Catalyzed Benzoin Condensation ... 121 Nitric Acid Oxidation of Benzoin to Benzil...
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courses.chem.psu.edu/chem36/Experiments.html
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Part 1: Synthesis of Benzoin ... Vitamin B1, thiamine, ... The enamine which we will produce, using benzaldehyde, can react with a second benzaldehyde molecule to produce the desired product, following the acyloin condensation pathway. The enamine functions much like the enolate partner in an acid-catalyzed aldol condensation.
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www.miracosta.edu/home/dlr/211exp10.htm
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The benzoin condensastion is an example of "ompoulung"--a case in which the usual reactive polarities have been reversed. ... 2) use of the nasty reagent, cyanide; Nowadays, people use thiamine hydrochloride rather than cyanide ion. Apparently, the thiamine-catalyzed reaction is a bit slower, but then the catalyst is edible.
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individual.utoronto.ca/ekwan/benzoin.pdf
individual.utoronto.ca/ekwan/benzoin.pdf
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Benzoin condensation - Wikipedia, the free encyclopedia
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The benzoin condensation is a reaction (often called a condensation reaction, for historical reasons) between two aromatic aldehydes, particularly benzaldehyde. The reaction is catalyzed by a nucleo...
en.wikipedia.org/wiki/Benzoin_condensation
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In this experiment, Thiamin will be used as a catalyst to carry out the self-condensation reaction of benzaldehyde. ... Thiamin, or vitamin B1, a colorless, crystalline substance, acts as a catalyst in carbohydrate metabolism, enabling pyruvic acid to be absorbed and carbohydrates to ... Benzoin Condensation Mechanism...
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www.usask.ca/chemistry/courses/255/laboratory/thiamine....
www.usask.ca/chemistry/courses/255/laboratory/thiamine.htm
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The Thiamine Catalyzed Benzoin Condensation,; CHAPTER #54, EXPT. 2, PAGE 521-525 (524) ... Part #A: Benzil from Benzoin,; CHAPTER #55, EXPT. 1, PAGE 526-531 (528). ... Dibenzalacetone by the Aldol Condensation,; CHAPTER #37, EXPT. 1, PAGE 383- 387 (384).
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faculty.kfupm.edu.sa/CHEM/ajhamdan/CHEM202/laboratory_s...
faculty.kfupm.edu.sa/CHEM/ajhamdan/CHEM202/laboratory_syllabus.htm
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It has been known since 1943 that thiamin (1) and related thiazolium salts can catalyze the benzoin condensation in the presence of mild base.1 The ...
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pubs.acs.org/cgi-bin/jtext?joceah/66/i15/abs/jo010244h
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