in which 50鈥 110 equiv of tert.-BuOH, EtOH, and H 2O were present in the reaction medium: the phenomenon interpreted in terms of the above deprotonation persisted in the presence of these proton sources and is probably instead due to a radical disproportionation of the monoanions (ketyls)...
& Coster, M.J. The boron-mediated ketone-ketone aldol reaction. Tetrahedron Lett. 46, 1505-1509 (2005).Cergol, K.M., Jensen, P., Turner, P. & Coster, M.J. Reversibility in the boron-mediated ketone-ketone aldol reaction. Chem. Commun., 1363-1365 (2007)....
摘要: Bis(trimethylsilyl) ketone (1) has been prepared by hydrolysis of the cr-chloro ether 3a on silica gel. Reaction of ketone 1 with organoaluminium, organomagnesium and organolithium compounds gave addition products and/or bis(trimethylsilyl)methanol(5)....
Ketone, any of a class of organic compounds characterized by the presence of a carbonyl group in which the carbon atom is covalently bonded to an oxygen atom. The remaining two bonds are to other carbon atoms or hydrocarbon radicals. The most important k
; The first examples of the directed, boron-mediated aldol reaction between different ketones are presented. Transformation of a variety of ketones to their corresponding boron enolates with Chx 2 BCl/Et 3 N, followed by reaction with acceptor ketones in diethyl ether, and oxidation of the resul...
enolateThe reaction of ketone enolates with phosphonate aldehyde 3 followed by acetylation and cyclization represents a useful carbanion-based strategy for the appendage of a functionalized six-membered ring.doi:10.1055/s-2001-14615Kraus, George A....
The determination of the volume of the hydrochloric acid solution added during the course of the biotransformation process allowed a continuous monitoring of the reaction progress performed in an aerated, stirred-tank reactor. 展开 关键词: Penicillium roqueforti methyl-ketone 2-heptanone immobilized ...
Acetoacetateis the centralketone body. It is reduced toBHBby BHBdehydrogenase(BHD) in a NADH-requiring reversible reaction: R-3-hydroxybutyrate+NAD+↔acetoacetate+NADH+H+ The ratio of BHB to AcAc is determined by the mitochondrial redox state (the ratio of NADH to NAD+). BHB is nonvolatile...
Studies of the kinetics and mechanisms of the type II photoelimination reaction of some styrene-vinyl aromatic ketone copolymers in solution are reported. Effects of solvent, ketone content, and ketone structure on the lifetime of the chromophores and the quantum yield of polymer chain scission were...
6) ketal reaction 缩酮反应 1. The H 3PW 12O 40 catalytic activity to the ketal reaction was discussed . 探讨了H3 PW12 O40 对缩酮反应的催化活性 ,较系统地研究了酮醇物质的量比、催化剂用量、反应时间等因素对产品收率的影响。 更多例句>> 补充资料:庚基酚、二硫化碳、甲醛和肼的反应产物 CAS...