The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Cobaltate anion couples terminal dienes with trifluoroacetic anhydride: a direct fluoroacylation of 1,3-dienes. Learn about our remote access options, State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China. You’ve supercharged your research process with ACS and Mendeley! Crossed Claisen Condensation. This means that we're kind of breaking the rules. Homo‐ and cross‐Claisen condensation reactions are usually carried out using a Ti(IV)‐based reagent at ultra‐low‐temperatures. The condensing bases may be sodium, sodium ethoxide, sodium hydride, potassium t-butoxide, etc. via the Altmetric Attention Score and how the score is calculated. The Claisen rearrangement is an exothermic, concerted (bond cleavage and recombination) pericyclic reaction. Yuhan Zhou, Dongmei Yang, Gen Luo, Yilong Zhao, Yi Luo, Na Xue, Jingping Qu. This article has been corrected. Dongxin Zhang, Junchao Zhong, Lei Yin, Yan Chen, Jingjing Man. Find more information on the Altmetric Attention Score and how the score is calculated. The Claisen condensation between a ketone and a thionoester has been widely employed for the synthesis of β-oxo thioketones (Equation (39)).Sodamide is commonly used as the base, and the reaction has proved to be applicable to aryl methyl ketones and some aliphatic ketones < 77JCS(P1)1127, 77JOC3123, 77S256 >. Detrifluoroacetylation Reaction of Trifluoromethyl-β-diketones: Facile Method for the Synthesis of Succinimide Derivatives and 1,4-Diketones. These metrics are regularly updated to reflect usage leading up to the last few days. One equiv serves as the nucleophile (enolate) and the other is the electrophile which undergoes addition and elimination. China. Yilong Zhao, Yuhan Zhou, Juan Liu, Dongmei Yang, Liang Tao, Yang Liu, Xiaoliang Dong, Jianhui Liu, and Jingping Qu . The American Chemical Society holds a copyright ownership interest in any copyrightable Supporting This method is particularly suitable for the synthesis of isotopically‐labelled acetylacetic ester compounds. without permission from the American Chemical Society. A highly efficient, operationally simple approach to trifluoromethyl ketones has been developed that builds on the use of a tandem process involving Claisen condensation and retro-Claisen C–C bond cleavage reaction. The reaction is driven to product by the final deprotonation step. Yilong Zhao, Yuhan Zhou, Chunxia Zhang, Huan Wang, Jinfeng Zhao, Kun Jin, Jihong Liu, Jianhui Liu, Jingping Qu. Claisen condensations between different ester reactants are called Crossed Claisen reactions. Aldol condensation occurs in aldehydes having α-hydrogen with a dilute base to give β-hydroxy aldehydes called aldols. Palladium-catalyzed carbonylative coupling of aryl iodides with an organocopper reagent: a straightforward procedure for the synthesis of aryl trifluoromethyl ketones. Use of a Cyclometalated Iridium(III) Complex Containing a N∧C∧N-Coordinating Terdentate Ligand as a Catalyst for the α-Alkylation of Ketones and N-Alkylation of Amines with Alcohols. -Claisen-type C–C bond cleavage of diketones with tropylium catalyst. Kate Ellis-Sawyer, Ryan A. Bragg, Nick Bushby, Charles S. Elmore, Michael J. Hickey. A highly efficient, operationally simple approach to trifluoromethyl ketones has been developed that builds on the use of a tandem process involving Claisen condensation and retro-Claisen C–C bond cleavage reaction. not otherwise permitted to reproduce, republish, redistribute, or sell any Supporting Information Neha Hura, Afsana Naaz, Shweta S. Prassanawar, Sankar K. Guchhait, and Dulal Panda . http://pubs.acs.org/page/copyright/permissions.html, https://doi.org/10.1021/acs.orglett.6b00851, https://doi.org/10.1021/acs.orglett.5b01344, https://doi.org/10.1016/j.jfluchem.2018.05.013, https://doi.org/10.1016/j.jfluchem.2015.01.015, https://doi.org/10.1016/j.tet.2014.05.017. The condensation of an aromatic aldehyde with an aliphatic aldehyde or ketone in the presence of a base or an acid to form an α,β‐unsaturated aldehyde or ketone with high chemoselectivity is generally known as Claisen–Schmidt condensation. Recent Advances in the One-Step Synthesis of Distally Fluorinated Ketones.
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