Cyclization of 3-allylhex-5-enyl radical: mechanism, and implications concerning the structures of cyclopolymers
作者:Athelstan L. J. Beckwith、Graeme Moad
DOI:10.1039/p29750001726
日期:——
trans-1-allyl-3-methylcyclopentane (23) and (19), bicyclo[4.2.1]nonane (33), exo-3-methyl-bicyclo[3.2.1]octane (35), and other hydrocarbons. The formation of bicyclic systems from the 3-allylhex-5-enyl radical (16) involves two discrete steps, the kinetic parameters of which have been determined. The results suggest that homoconjugative interaction between the double bonds in the dienyl radical (16)
用三丁基锡烷自由基引发的3-allylhex-5-enyl溴化物(15)的自由基还原反应生成4-乙基庚-1,6-二烯(17),顺式和反式-1-烯丙基-3-甲基环戊烷(23)和(19) ),双环[4.2.1]壬烷(33),exo-3-甲基-双环[3.2.1]辛烷(35)和其他碳氢化合物。由3-烯丙基六烯基(16)形成双环系统涉及两个离散步骤,其动力学参数已确定。结果表明,二烯基自由基(16)中双键之间的共轭相互作用会影响第一步环化反应的速率和立体选择性,但不会影响区域选择性。无法提供双环[3.3.1]壬烷的反应表明,先前分配给衍生自三烯丙基单体的环聚合物的结构可能不正确。