作者:M. Liliana Graziano、M. Rosaria Iesce、Flavio Cermola、Giuseppina Ialongo
DOI:10.1039/a607507j
日期:——
On hydrolysis, the bicyclohexanes 1a,b give the cyclobutanes 2a,b
and/or the cyclobutenes 3a,b. On bromination they lead to the
bromocyclobutanes 5a,b and the dibromocyclobutane 6a or the
bromocyclobutene 7b, respectively. The ease of the electrophilic
ring-opening of compounds 1a,b can be explained by assuming that the
presence of the methoxycarbonyl and gem-dimethoxy groups at C-1
and C-2 favours the formation of well-stabilized ionic intermediates or
polar transition states. However, the brominations may involve radical
pathways, even to a minor extent, and these would lead to the same
products.
在水解反应中,双环己烷1a,b可生成环丁烷2a,b和/或环丁烯3a,b。在溴化反应中,它们分别生成溴代环丁烷5a,b、二溴环丁烷6a或溴代环丁烯7b。化合物1a,b的亲电开环反应很容易,这可以解释为C-1和C-2上的甲氧羰基和gem-二甲氧基基团有利于形成稳定离子中间体或极性过渡态。然而,溴化反应可能涉及自由基反应路径,即使程度很小,也会生成相同产物。