A simple and efficient synthesis of cisoid, transoid, transoid- and all-cisoid-trimers of benzocyclobutene; a novel formation of Z,Z,Z-tribenz[12]annulene from the latter trimer
作者:Masahiko Lyoda、Yoshiyuki Kuwatani、Tetsuhiro Yamauchi、Masaji Oda
DOI:10.1039/c39880000065
日期:——
The cisoid, transoid, transoid- and all cisoid-trimers of benzocyclobutene were synthesised from 1,2-dibromo-1,2-dihydrobenzocyclobutene using nickel-catalysed cyclo-trimerisation; thermal ring-opening of the all-cisoid-trimer gave Z,Z,Z-tribenzo[a,e,i]cyclododedcene (Z,Z,Z-tribenz[12]annulene) which can be converted into its silver and chromium complexes.
The Thermal Retro[2+2+2]cycloaddition of Cyclohexane Activated by Triscyclobutenannelation: Concerted All-Disrotatory versus Stepwise Conrotatory Pathways to Fused [12]Annulenes
作者:Michael J. Eichberg、K. N. Houk、Jürg Lehmann、Philip W. Leonard、Anne Märker、Joseph E. Norton、Dorota Sawicka、K. Peter C. Vollhardt、Glenn D. Whitener、Stefan Wolff