9-Ethynylfluorenyl radical derivatives were readily prepared in situ and underwent simultaneous intermolecular coupling reactions. Interestingly, the dimerization process took place in either a head-to-tail or a head-to-head mode between the acetylenic or the allenic resonance forms dependent on the terminal substituents, which could be well explained by their different spin distribution and steric hindrance effects
A Novel Synthesis of Spirocyclopropenes from the Haloallene Derivatives with Alkanethiolate Ions
作者:Takashi Toda、Masahiro Kuwana、Yoshitaka Ohhashi、Masaaki Yoshida
DOI:10.1246/cl.1997.21
日期:1997.1
Reactions of 1-bromo-1-substituted-2-(9-fluorenylidene)ethenes with alkanethiolate ions gava spiro[1-alkylthiocyclopropene-3,9′-fluorenes]. The bromoallene derived from 2,3-diphenylindene also afforded the corresponding spirocyclopropene compound.