Dimerization of chloropolyphenylallenes 1a-c occurs via bisallyl diradicals 2a-c, the closure of which leads either to 1,2-dialkylidene cyclobutanes 8b,c, or to the dihydronaphthalenic compounds 3a-c which afford after elimination of HCl and cyclization the naphthocyclobutenes 5a-c. The latter, by opening and cyclization involving a further loss of HCl, are readily transformed in high yields into the
氯代聚苯
丙二烯1a-c的二聚反应是通过
双烯丙基二自由基2a-c进行的,其封闭导致1,2-二亚烷基
环丁烷8b,c或二氢
萘化合物3a-c,在除去HCl和环化后得到
萘环丁烯5a -c。后者,通过打开和环化反应,涉及到另外的HCl损失,很容易以高收率转化为
萘并烷7a-c。一些1,2-二亚烷基
环丁烷8也可以通过热打开生成
萘并烷7以生成双自由基2,然后进行环化。此多步骤过程为所谓的“鲁宾”反应(俗称的5、6、11、12-四苯基
萘并苯)提供了一般性解释,该反应是从充当外来物前体的聚苯基炔丙基化合物开始向
萘并苯合成的途径。