作者:Margaret A. O'Leary、Geoffrey W. Richardson、Dieter Wege
DOI:10.1016/s0040-4020(01)97702-6
日期:1981.1
trans-10-methyl-9a, 10-dihydrobenz[α]azulene 3, respectively. A mechanism involving initially the addition of the carbene benzocyclobutenylidene, or its 2-Me derivative, to the benzene ring is postulated. A proposed intermediate in the reaction, spiro [benzocyclobutene 1,7' cyclohepta-1',3',5'-triene] 12 has been synthesised, and shown to give rise to 4 under the reaction conditions. The rate of rearrangement
苯并环丁烯酮甲苯磺酸and和2-甲基苯并环丁酮甲苯磺酸the的钠盐在苯中的热分解分别得到9a,10-二氢苯并[α] azulene 4和反式-10-甲基-9a ,10-二氢苯并[α] azulene 3。推测最初涉及将卡宾苯并环丁烯基或其2- Me衍生物加至苯环的机理。反应中所建议的中间体螺[苯并环丁烯1,7'环庚-1',3',5'-三烯] 12已合成,显示在反应条件下可生成4。测量了12→4的重排速率,并确定了活化能:Ea= 125.9±0.8KJmol -1,A = 1.38×10 14 sec -1。重排的机理必须涉及12的苯并环丁烯部分的开环以产生邻二甲苯中间体,该中间体被假定具有相当大的双自由基特性。在71.8°时,此开环速度比母体苯并环丁烯分子的开环速度快2.7×10 6倍。还研究了2-(7'-环庚-1',3',5'三烯基)苯甲醛甲苯磺酰the的钠盐的分解,结果表明生成4a,10-二氢苯并[α]