Medium-sized cyclophanes. Part XVI. Substitution versus transannular reaction of [2.2]metacyclophanes with benzoyl peroxide and cupric chloride. Importance of a cation radical intermediate in the transannular dehydrogenation
作者:Kozaburo Nishiyama、Kazuo Hata、Takeo Sato
DOI:10.1039/p29740000577
日期:——
treated with benzoyl peroxide (BPO) and cupric chloride in acetonitrile; one is nuclear substitution giving the 4-benzoate and the 8-cyanomethyl derivatives, each formed by a radical attack via a cyclohexadienyl intermediate, and the other is transannular dehydrogenation to give pyrene and hydropyrenes. The latter reaction occurs with BPO alone or with other metal halides. Transannular dehydrogenation is