which cannot be used in a claisen condensation

Posted by: on Friday, November 13th, 2020

With an accout for my.chemeurope.com you can always see everything at a glance – and you can configure your own website and individual newsletter. A. two esters, both without alpha hydrogens B. one ester with an alpha hydrogen and one ester without an alpha hydrogen C. two esters, both with alpha hydrogens D. all of these E. none of these. A major difference with the aldol reaction is the fact that hydroxide cannot be used as a base because it could possibly react with the ester. 58. • • Assertion: Esters which contain α-hydrogens undergo Claisen condensation. NaH is also … A diester can undergo an intramolecular reaction called a Dieckmann condensation. In mixed Claisen condensations, a non-nucleophilic base such as lithium diisopropylamide, or LDA, may be used, since only one compound is enolizable. a. A major difference with the aldol reaction is the fact that hydroxide cannot be used as a base because it could possibly react with the ester. The Claisen condensation is an organic reaction used to form a carbon-carbon bond between two ester molecules using an alkoxide base in alcohol to make a β-keto ester. Legal. Basic reaction. Watch the recordings here on Youtube! Predict the product for the following reaction. The esters having active methylene group (- CH 2 -), show Claisen Condensation reaction. II. Predict the major product for the following reaction. The classic Claisen condensation, where only one enolizable ester is used. A. & In a fashion similar to the aldol, one ester acts as a nucleophile while a second ester acts as the electrophile. Crossed Claisen reactions in which both reactants can serve as donors and acceptors generally give complex mixtures. Because of this most Crossed Claisen reactions are usually not performed unless one reactant has no alpha hydrogens. Which Cannot Be Used In A Claisen Condensation? Draw the bond-line structures for the products of the following reactions. LDA, -78°c 2. Terms b. Purification and Characterisations of Organic Compounds. Which cannot be used in a Claisen condensation? Transesterfication can occur when esters react, and this transesterfication would result in a mixture of products. NaOCH2CH3 2. A major difference with the aldol reaction is the fact that hydroxide cannot be used as a base because it could possibly react with the ester. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. A major difference with the aldol reaction is the fact that hydroxide cannot be used as a base because it could possibly react with the ester. Claisen condensations between different ester reactants are called Crossed Claisen reactions. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. As C6H5- COOC2H5 has no α-hydrogen atom or active methylene group, so it cannot undergo Claisen- Condensation reaction. Prof. Steven Farmer (Sonoma State University). sodium ethoxide if ethanol is formed) is often used, since the alkoxide is regenerated. A. two esters, both without alpha hydrogens B. one ester with an alpha hydrogen and one ester without an alpha hydrogen C. two esters, both with alpha hydrogens D. all of these E. none of these 23. identify the product formed in a given Claisen condensation reaction. HCl, H2O NaOH, H20 Heat HCI, H2O Heat compoun da compound b-: compound c (C5H8O) Work out this synthesis on a separate sheet of … Which one of the following compounds would favor the enol tautomer over the ketone tautomer? Your browser does not support JavaScript. Your IP: 144.76.84.38 For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE. To use all the functions on Chemie.DE please activate JavaScript.

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