Linear copolymers of ethylene and acrylonitrile were prepared using palladium complexes bearing phosphine-sulfonate bidentate ligands. Acrylonitrile units located in the linear polyethylene backbones were detected for the first time by 13C NMR spectroscopy. Catalyst systems employing isolated palladium complexes such as 3 showed much higher activity for the copolymerization than the in situ generation
Highly dispersed potassium on alumina (K/Al2O3) acts as a metalatingagent towards enolizable compounds and the intermediate organopotassium derivatives can be alkylated with primary alkyl bromides. The reaction conditions are dependent on the substrate. In particular, tetrahydrofuran is the solvent of choice for the metalation of nitriles and aldehydeN,N-dimethylhydrazones at −60°C and of N-cyclohexyl
氧化铝上高度分散的钾(K / Al 2 O 3)作为可烯醇化化合物的金属化剂,中间有机钾衍生物可以用伯烷基溴化物烷基化。反应条件取决于底物。特别地,四氢呋喃是在-60℃下腈和醛N,N-二甲基hydr和N-环己基酮亚胺在室温下金属化的选择的溶剂,而己烷必须用于酮。
ALKYLATION REACTION ACCOMPANIED BY DEALKOXYCARBONYLATION OF β-KETO ESTERS, GEMINAL DIESTERS AND α-CYANO ESTER IN HEXAMETHYLPHOSPHORIC TRIAMIDE (HMPA)
作者:Morio Asaoka、Kazutoshi Miyake、Hisashi Takei
DOI:10.1246/cl.1975.1149
日期:1975.11.5
In the presence of alkali halide β-keto esters, geminal diesters and ethyl cyanoacetate in HMPA reacted with alkyl halides to give α-alkylated ketones, esters and nitrile, respectively. α-Acetyl-γ-butyrolactone and its derivative afforded corresponding acylcyclopropane derivatives.
Facile transformation of substituted allyl malonates to monocarboxylic acids and esters by the reaction with ammonium formate catalyzed by palladium complexes