The Thermal [2+2] Cycloaddition of 1-Halo-2-(9-fluorenylidene)ethylene to Afford Fluorene-9-spiro-1′-[2′-halo-3′-(9-fluorenylidene)-4′-halomethylene]cyclobutane
The Thermal [2+2] Cycloaddition of 1-Halo-2-(9-fluorenylidene)ethylene to Afford Fluorene-9-spiro-1′-[2′-halo-3′-(9-fluorenylidene)-4′-halomethylene]cyclobutane
作者:Fumio Toda、Hiroharu Motomura、Hirofumi Oshima
DOI:10.1246/bcsj.47.467
日期:1974.2
The thermal [2+2]cycloaddition products of 1-chloro-(II) and 1-bromo-2-(9-fluorenylidene)ethylene (X) were found to be two head-to-tail dimers, fluorene-9-spiro-1′-[2′-chloro-3′-(9-fluorenylidene)-4′-chloromethylene]cyclobutane (VI) and its bromo-analog (XI) respectively.