Reduction of semibullvalene (5) with potassium more closely resembles deprotonation of tetrahydropentalenes by n-butyl-lithium-potassium t-pentoxide than it does the reduction of (5) with lithium; the former prccesses both provide the cyelo-octatetraenyl dianion (4), plausibly via the intermediate bicyclo[3.3.0]octadienediyl dianion (3).
Ring opening of a bicyclo[3.3.0]octadienediyl dianion
作者:Dieter Wilhelm、Timothy Clark、Paul von Ragué Schleyer、Alwyn G. Davies
DOI:10.1039/c39840000558
日期:——
The bicyclo[3.3.0]octadienediyl dianion (3) ring opens to give the cyclo-octatetraene dianion (4), the reverse of the behaviour shown by the corresponding dication.