Potential psychotropic and antihistamine agents: 1- and 3-alkyl-9-(3-dimethylaminopropylidene)-thioxanthenes and 3-alkyl-11-piperazino-10,11-dihydrodibenzo[b,f]thiepins
Gas phase generation and cyclisation reactions of some o-substituted phenyl radicals
作者:J.I.G. Cadogan、H.Susan Hutchison、Hamish McNab
DOI:10.1016/s0040-4020(01)90385-0
日期:1992.9
Flashvacuumpyrolysis of the allyl esters 2 (XO,S, CH2, CO) at 900°C (10−2 Torr) gives dibenzofurans, dibenzothiophenes, fluorenes, and fluorenones respectively as the major products. The mechanism involves the phenyl radical intermediates 1 which equilibrate by intramolecular hydrogen transfer via six-membered transition states, prior to cyclisation.
Photochemical reactions of hydroxamicacids have been studied. The intermediacy of a RCONH radical is postulated, based on oxidations achieved with DCA under photochemical conditions.