unit appended on the single-carbon linker, the ligand harbors an unusually rigid backbone that presumably stabilizes its complexation with transition metals during catalysis. Compared with the known dppm ligand, it exhibited superior reactivity and regioselectivity in a number of alkene hydrofunctionalization reactions, catalyzed by iridium and rhodium.
Preparation of 1-Bromo-1-chloro-, 1,1-Dibromo- or 1,1-Dichloroalk-1-enes from Ketones
作者:Hadi Rezaei、Jean F. Normant
DOI:10.1055/s-2000-6225
日期:——
An efficient three steps process for converting aliphatic ketones to the homologous gem-bromochloro, or gem-dibromo alkenes is presented.
提出了一种将脂肪族酮转化为同系体gem-溴氯或gem-二溴烯烃的高效三步法。
Novel cyclo-oligomerization of nickel carbenoids: a simple and efficient synthesis of radialenes
作者:Masahiko Iyoda、Akira Mizusuna、Hiroyuki Kurata、Masaji Oda
DOI:10.1039/c39890001690
日期:——
Novel cyclo-oligomerization of nickel methylenecarbenoids generated from 1,1-dihalogenoethenes with chemically activated nickel gives [3]-, [4]-, and [5]-radialenes directly under mild conditions.
Nucleophilic attacks on carbon-carbon double bonds. 34. Intramolecular elements effect in competitive expulsion of two halide nucleofuges as a tool for investigating the rapid step of nucleophilic vinylic substitution
La substitution du bromochloromethylene-9fluorene et du bis-[nitro-4 phenyl]-1,1 bromo-2 chloro-2 ethylene par le p-toluenethiolate ou le p-cresolate donne les produits correspondants monobromes, monochlores et de disubstitution
La 取代 du bromochloromethylene-9fluorene et du bis-[nitro-4 phenyl]-1,1 bromo-2 chloro-2 ethylene par le p-甲苯硫醇 ou le p-cresolate donne les produits 通讯员 monobromes, monochlores et de dissubstitution
Synthesis and Structure of the First Alkylidenetelluragermirane
The firststable alkylidenetelluragermirane 4 was synthesized by the reaction of an overcrowded diarylgermylene Tbt(Mes)Ge: 2b (Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl; Mes = mesityl) with 9-(dichloromethylene)fluorene, 3, followed by addition of tributylphosphine telluride. X-ray crystallographic analysis of 4 shows that the geometry of its telluragermirane ring can be explained in terms
通过使过度拥挤的二芳基锗烯Tbt(Mes)Ge:2b(Tbt = 2,4,6-三[双(三甲基甲硅烷基)甲基]苯基; Mes =异丁烯基)与9-(二氯亚甲基)反应合成第一稳定的亚烷基四氢呋喃基氨基甲酸酯 4芴3,然后加入三丁基膦碲化物。X射线晶体学分析4显示,可以用碲原子与锗-碳双键的π络合物结合模型来解释其碲金属氰烷环的几何形状。