Efficient method for the synthesis of monohalocyclopropanes by reduction of gem-dihalocyclopropanes with i-Bu2AlH in the presence of Ti and Zr complexes
摘要:
We have investigated the reductive dehalogenation reaction of alkyl and aryl substituted gemdihalocyclopropanes with diisobutyl aluminum hydride in the presence of catalytic amounts of titanium and zirconium complexes. As a result we propose a general method for the synthesis of substituted monohalocyclopropanes and cyclopropanes of various structures. We have also studied the stereochemistry of the reduction.
Diazo chemistry controlling the selectivity of olefin ketonisation by nitrous oxide
作者:Ive Hermans、Bart Moens、Jozef Peeters、Pierre Jacobs、Bert Sels
DOI:10.1039/b704351a
日期:——
constants by TransitionState Theory. Compelling theoretical and experimental evidence is presented that an oxadiazole intermediate not only can undergo a hydrogen shift, but eventually also a methyl- or even an alkyl-shift. Special emphasis is also given on a hitherto neglected decomposition of the oxadiazole via a concerted C-C and N-O cleavage. For some substrates, such as internal olefins, this diazo
Photoreductive Dehalogenation of Organic Halides in the Presence of Lithium Aluminum Hydride
作者:Nobujiro Shimizu、Kenji Watanabe、Yuho Tsuno
DOI:10.1246/bcsj.57.885
日期:1984.3
Lithium aluminum hydride markedly accelerates photoreductive dehalogenation of cyclopropyl, aromatic, and olefinic halides carried out in ether.
氢化铝锂显着加速环丙基、芳族和烯属卤化物在醚中进行的光还原脱卤。
Synthesis of cyclopropanes by the reaction of olefins with dialkylzinc and methylene iodide
作者:J. Furukawa、N. Kawabata、J. Nishimura
DOI:10.1016/0040-4020(68)89007-6
日期:1968.1
A novel synthetic route to cyclopropanes by the reaction of olefins with dialkylzinc and methylene iodide is described. The essential feature of the reaction is similar to that of the Simmons-Smith reaction which involves the treatment of olefins with methylene iodide and zinc-copper couple. However, the novel route gives cyclopropanes more easily and is particularly suitable for the conversion of
Methoxymercuration/demercuration reactions of cyclopropanes in the presence of acrylonitrile
作者:Bernd Giese、Wolfgang Zwick
DOI:10.1016/0040-4039(80)80237-1
日期:——
Methoxymercuration/demercuration reactions of cyclopropanes 4 in the presence of acrylonitrile yield products 5 in a carbon-carbon bond formation reaction.
在丙烯腈存在下,环丙烷4的甲氧基汞化/脱汞反应在碳-碳键形成反应中产生产物5。
Aluminum chloride catalyzed hydrosilylation of cyclopropanes with chlorodimethylsilane
Aluminumchloride can be utilized as an active catalyst for the highly regioselective hydrosilylation of 1-alkyl, 1-aryl, 1,1-dialkyl, and cyclic cyclopropanes with chlorodimethylsilane in hexane at room temperature.