Enolate-Based Regioselective Anti-Beckmann C–C Bond Cleavage of Ketones
作者:Tomáš Mašek、Ullrich Jahn
DOI:10.1021/acs.joc.1c01169
日期:2021.9.3
provides a direct and regioselective way of fragmenting ketones into esters and oximes or ω-hydroxyimino esters, respectively. A comprehensive study of the scope of this reaction with respect to ketone classes and alkyl nitrites is presented. Control over the site of cleavage is gained through regioselective enolate formation by various bases. Oxidation of kinetic enolates of unsymmetrical ketones leads to
Catalytic Acceptorless Dehydrogenation of Aliphatic Alcohols
作者:Hiromu Fuse、Harunobu Mitsunuma、Motomu Kanai
DOI:10.1021/jacs.0c00123
日期:2020.3.4
aliphatic secondary alcohols to ketones undervisiblelight irradiation at room temperature by devising a ternary hybrid catalyst system comprising a photoredox catalyst, a thiophosphate organocatalyst, and a nickel catalyst. The reaction proceeded through three main steps: hydrogen atom transfer from the α-C-H bond of an alcohol substrate to the thiyl radical of the photo-oxidized organocatalyst, interception
Deuterium-induced 13C NMR isotope shifts for signal assignments and determination of deuteriation site in cyclododecanone
作者:D. Jeremíc、S. Milosavljević、M.Lj. Mihailović
DOI:10.1016/0040-4020(82)80113-0
日期:1982.1
in the 13C 1H} NMR spectra of monodeuteriated cyclododecanones formed upon oxidation of [1-2H1] cyclododecanol with leadtetraacetate. These shifts, when used in conjunction with 13C NMR data of specifically labelled analogues, [2, 2, 12, 12-2H4]- and [2-2H1] cyclododecanone, enabled the ketone formed with leadtetraacetate to be identified as a mixture of [5-2H1]- and [6-2H1] isotopomers.
在由四乙酸铅氧化[ 1-2 H 1 ]环十二烷形成的单氘代环十二烷的13 C 1 H} NMR光谱中测量了氘诱导的13 C同位素位移。这些变化,与结合使用时13个特异性标记类似物的C NMR数据,[2,2,12,12- 2 ħ 4 ] -和[2- 2 ħ 1 ]环十二酮,启用与四乙酸铅所形成的酮为鉴定为[5- 2 H 1 ]-和[6- 2 H 1 ]同位异构体的混合物。
Ranganayakulu; Murthy, Journal of the Indian Chemical Society, 2011, vol. 88, # 2, p. 307 - 313