Chemoselective and Stereoselective Debromination of Vicinal-Dibromides with Sodium Dithionite
作者:Jitender M. Khurana、Arti Sehgal
DOI:10.1080/00397919608003795
日期:1996.10
Abstract A simple and effcient procedure for the quantitative debromination of vic-dibromides has been reported with sodium dithionite at ambient temperature. These eliminations are chemoselective and also stereoselective.
methyllithium in the presence of ethyl vinyl ether. A cyclopropane derivative was not obtained from the reaction of 9,9-dibromofluorene (III) or 9,9-dichloro-9H-tribenzo[a.c.e]cycloheptene (IV) with alkyllithium in olefin but 9,9′-bifluorenylidene (IX) and 9,9′-dibromo-9,9′-bifluorenyl (XI) were produced from III and 9-methylene-9H-tribenzo[a.c.e]cycloheptene (XXIII) and 9H-tribenzo-[a.c.e]-cyclohepten-9-ol
The Isomerization of the Stable Rotamers of 9,9′: 9′,9″-Terfluorenyls
作者:Masahiro Minabe、Kazuo Suzuki
DOI:10.1246/bcsj.48.1480
日期:1975.5
The conformational change of the s-cis, s-trans-9,9′: 9′,9″-terfluorenyl to the s-cis, s-cis form via the radical process was performed by means of a reaction with N-bromosuccinimide and with various oxidizing agents. A reverse change occurred on treatment with lithium aluminum hydride and with sodium bis(2-methoxyethoxy)aluminum hydride.
Chemoselective Reduction of Vicinal-Dihalides with Mg-MeOH<i>via</i>SET
作者:Jitender M. Khurana、Amita Gogia neé Puri、Ramesh K. Bankhwal
DOI:10.1080/00397919708004093
日期:1997.5
Chemoselective reductions of vic-dihalides conjugated to a phenyl and/or an ester group are being reported with Mg-MeOH at ambient temperature. However, reactions with Mg-MeOH-THF led to the formation of alkenes predominantly. The reactions are proposed to proceed by SET from Mg.