Enol and enolate (carbanion) intermediates in nitrosation. Reactions of ethyl cyanoacetate, diethyl malonate and malononitrilenitrosation, denitrosationChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ...
Enols and Enolates Practice Quizzes (MOC Membership) Note 1–“Enols not as nucleophlic as enolates.”The conjugate base is always a better nucleophile than the corresponding neutral species. One quantification for RO(-) versus ROH, for example, has CH3CH2O(–) at about 10 orders of magn...
Silyl enol ethers, which are isolable equivalents of metal enolates, are useful and important intermediates in synthetic chemistry [1–3]. They react as a good nucleophile for the introduction of a carbon skeleton or a functional group at the α-position of a carbonyl group under appropriate ...
metalenolateintermediates,whicharenotgenerallystableinsolutionevenatlowtem- perature.Forinstance,copper(II)enolatesthusgeneratedundergorapidoxidativecou- plingtoaffordthecorresponding1,4-diketonesand1,2-dicarboxylates(Scheme1).[1],[2] Regioselectiveoxidativedimerizationofketoneswasfirstachievedbyuseofsilylenol...
Since the π-allylpalladium cation must serve as the counterion for the enolate, the enolate probably exists as a tight-ion-pair. This largely prevents the common side reactions of enolates associated with the equilibrium between different enolates. The much milder reaction conditions as well as ...
An excellent candidate as a proton substitute in man-made organic reactions is a Lewis acid. The goal of the research was to engineer an artificial proton ... H Yamamoto,A Yanagisawa,K Ishihara,... - Springer US 被引量: 82发表: 1999年 Asymmetric Protonation of Enolates Efficient chiral pr...
O-Silylated dienolates in organic synthesis: γ-Selective alkylation of unsaturated carbonyl compounds by 1,5-dithienium fluoroborate. 1981, Tetrahedron Letters Show abstract Time-resolved resonance Raman and density functional theory investigation of iodocyclopropanation and addition reactions with alkenes ...
Silyl enol ethers are stable intermediates commonly used in alkylation reactions of enolates. They can be easily purified and stored, allowing for selective formation of difficult reactions. AI generated definition based on:Comprehensive Organic Synthesis (Second Edition),2014 ...
The reactions of unsymmetrically substituted ketones with trichloroacetyl p-toluenesulphonate, isopropenyl acetate and acetic anhydride were investigated. Trichloroacetyl p-toluenesulphonate converted the saturated ketone 2 to the enol t... J Libman - 《Tetrahedron》 被引量: 60发表: 1969年 Trapping of ...
Trichlorosilyl enolates derived from the chiral methyl and ethyl ketones were subjected to aldolization in the presence of phosphoramides, and the intrinsic selectivity of these enolates and the external stereoinduction from chiral catalyst were studied. In the reactions with the lactate derived ...