Halogen−Metal Exchange in 1,2-Dibromobenzene and the Possible Intermediacy of 1,2-Dilithiobenzene
作者:Holger F. Bettinger、Matthias Filthaus
DOI:10.1021/jo7013033
日期:2007.12.1
The one-step high-yield synthesis of 1,2-bis(trimethylsilyl)benzene from 1,2-dibromobenzene using tert-butyllithium and trimethylsilyltriflate is reported. A mechanistic investigation shows that 1,2-dilithiobenzene is not an intermediate in this reaction; the coexistence of trimethylsilyltriflate and tert-butyllithium at very low temperatures allows a sequence of bromine−lithium exchange and subsequent
Synthesis of cyclic bifunctional organomagnesium compounds. X-ray crystal structures of tetrameric organomagnesium clusters
作者:Marcus A. G. M. Tinga、Gerrit Schat、Otto S. Akkerman、Friedrich Bickelhaupt、Ernst Horn、Huub Kooijman、Wilberth J. J. Smeets、Anthony L. Spek
DOI:10.1021/ja00060a030
日期:1993.4
Three cyclic bifunctional organomagnesium compounds were prepared by three different routes. Reaction of 1,8-dibromo- or 1,8-diiodonaphthalene with metallic magnesium gave the corresponding di-Grignard reagents 3, from which the halide-free 1,8-naphthalenediylmagnesium (4) was isolated. o-Phenylenemagnesium (10) was prepared by transmetalation from o-phenylenemercury with magnesium. The reaction of