1,2-二炔基苯与BCl 3的硼化环化反应会生成二苯并戊烯(通过分子内S E Ar)或苯并富勒烯(通过氯化物加成),具体取决于取代基,并带有稳定的乙烯基阳离子中间体(例如,对-MeO-C 6 H 4-组)赞成后者。使用borocations引线以更有选择性dibenzopentalene形成,而其他二炔框架经历分子内小号Ë用Ar选择性甚至p -MeO基团。
bromo-, and iodo-carbene complexes of manganese and rhenium were obtained on nucleophilic addition of X− (X = F, Cl, Br, I) to various cationicdicarbonyl(cyclopentadienyl)arylcarbyne complexes [C5H5(CO)2MCR]+ Y− (M = Mn, Re). This reaction is influenced by the kind of anion Y− as well as solvent effects and depends on the ability of the substituent R to withdraw electron density from the carbyne carbon