Decarboxylation reaction. VIII. Reaction of electron-deficient carbon-carbon double bonds with trichloroacetic acid. A unique 1,1-dichlorocyclo-propane formation through .BETA.-trichloromethylation.
作者:KATSUMI NANJO、KUNIO SUZUKI、MINORU SEKIYA
DOI:10.1248/cpb.26.848
日期:——
The present paper describes the 1, 1-dichlorocyclopropane formation from highly electron-deficient carbon-carbon double bonds conjugated, in the main, with two cyano groups by allowing to react with trichloroacetic acid. β-Trichloromethylation was indicated in some cases. Path of the 1, 1-dichlorocyclopropane formation is presumed not to involve dichlorocarbene, but β-trichloromethylated intermediate.
Conversion of Nitroalkenes into β-(Trichloromethyl) Nitroalkanes
作者:Robert F. Cunico、Cui-Ping Zhang
DOI:10.1080/00397919108055452
日期:1991.11
The cesium fluoride-catalyzed reaction of (trichloromethyl)-trimethylsilane with conjugated nitroalkenes affords beta-(trichloromethyl)nitroalkanes.
NANJO KATSUMI; SUZUKI KUNIO; SEKIYA MINORU, CHEM. AND PHARM. BULL., 1978, 26, NO 3, 848-852
作者:NANJO KATSUMI、 SUZUKI KUNIO、 SEKIYA MINORU
DOI:——
日期:——
1,4‐Addition of TMSCCl
<sub>3</sub>
to Nitroalkenes: Efficient Reaction Conditions and Mechanistic Understanding
作者:Na Wu、Benoit Wahl、Simon Woodward、William Lewis
DOI:10.1002/chem.201402394
日期:2014.6.16
formation of the 1,4‐addition product, suggesting the reaction proceeds via a transient [Me3Si(alkene)CCl3] species, in which (alkene) indicates an Si⋅⋅⋅O coordinated nitroalkene. The anaerobic catalytic chain is propagated through the kinetic nitronate anion resulting from 1,4 CCl3− addition to the nitroalkene. This is demonstrated by the fact that isolated NBu4[CH2NO2] is an efficient promoter. Use
改进的合成条件允许以良好的产率 (70%) 和优异的纯度制备 TMSCCl 3。NBu 4 X [X=Ph 3 SiF 2 (TBAT)、F(四丁基氟化铵,TBAF)、OAc、Cl 和 Br]类型的化合物作为催化促进剂,用于对一系列环状和非环状硝基烯烃进行 1,4-加成, 在 0–25 °C 的 THF 中,通常具有中等至极好的收率 (37–95%)。TBAT 是最有效的促进剂,而溴化物最不有效。厌氧条件下的多核 NMR 研究(1 H、19 F、13 C 和29 Si)表明将 TMSCCl 3 添加到 TBAT(均为 0.13 M) 在 -20 °C 下,在没有硝基烯烃的情况下,立即导致 Me 3 SiF、Ph 3 SiF 和 NBu 4 CCl 3 的混合物。后者至少在 0 °C 下是稳定的,并且即使在延长的时间后,也不会在 -20 到 0 °C 之间添加硝基烯烃。硝基烯烃在 TMSCCl
Reactions of 3,3,3-Trihalogeno-1-nitropropenes with Arenes in the Superacid CF<sub>3</sub>SO<sub>3</sub>H: Synthesis of (<i>Z</i>)-3,3,3-Trihalogeno-1,2-diarylpropan-1-one Oximes and Study on the Reaction Mechanism
作者:Andrei A. Golushko、Maria A. Sandzhieva、Alexander Yu. Ivanov、Irina A. Boyarskaya、Olesya V. Khoroshilova、Alexey Yu. Barkov、Aleksander V. Vasilyev
DOI:10.1021/acs.joc.8b01406
日期:2018.9.7
3-trihalogeno-1,2-diarylpropan-1-one oximes C(Hal3)CH(Ar)–C(Ar)═NOH (CHal3-oximes) in yields of 23–99%. Such CHal3-oximes having one ortho-substituent in the aryl ring exist as atropoisomers in solutions at room temperature. Several cationic intermediates of this reaction were studied by means of NMR and DFT calculations, which proves the detailed reaction mechanism of the formation of CHal3-oximes in