Alumina-catalyzed cyclodimerization of 4-hydroxymethyl derivatives of 1,8-bis(dimethylamino)- and 1,8-dimethoxynaphthalenes to symmetrical spiro compounds
摘要:
4-Hydroxymethyl derivatives of 1,8-bis(dimethylamino)- and 1,8-dimethoxynaphthalenes undergo cyclodimerization on alumina to form symmetrical spiro compounds of the ''head-to-tail'' type. The reaction is considered to be a two-step electrophilic substitution with the participation of naphthylmethyl carbocations.