作者:Udo H. Brinker、Ilona Fleischhauer
DOI:10.1016/0040-4020(81)80016-6
日期:1981.1
adducts of 4, 5a and 5b were obt in the reaction with perfluorobut-2-yne. The formation of 1,5-dihydropentalene 4 is explained by a double ring expansion sequence involving consecutive carbene-carbene rearrangements with 1,3-carbon and subsequent 1,2-hydrogen shifts, supported by the reaction of double labelled (13C-depleted) 3. From readily available 3 at low temperatures formation and fusion of two
在-40°C下用甲基锂处理反式-1,2-双(2,2-二溴环丙基)乙烯3时,形成1,5-二氢戊烯(4)作为主要产物。另外,该反应提供了1-和2-丙二烯基环戊二烯(5a)和(5b),以及反式-1,2,4,6,7-八碳烯(6),新的C 8 H 8异构体。的狄尔斯-阿德耳加成物4,图5a和图5b中与perfluorobut -2-炔反应是OBT。1,5-二氢戊烯的形成4由双环扩展序列解释,该序列涉及具有1,3-碳的连续卡宾-卡宾重排以及随后的1,2-氢转移,由双标记(贫13 C)3的反应支持。在一个步骤中,由容易获得的3在低温下形成并形成两个5元环。