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
Flash vacuum pyrolysis 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.
在900°C(10 -2 Torr)下对烯丙基酯2(X = O,S,CH 2,CO)进行快速真空热解,分别得到二苯并呋喃,二苯并噻吩,芴和芴酮。该机理涉及在环化之前通过六元过渡态通过分子内氢转移而平衡的苯基自由基中间体1 。