PREPARATION OF POLYCYCLIC AROMATIC COMPOUNDS

摘要

A method for the preparation of 1,3-dimethyl substituted polycyclic aromatic compounds which comprises (1) subjecting a compound of structure where Ar is an aromatic or substituted aromatic group, to a mixed aldol condensation with propionaldehyde to form a 4-Ar-2-methyl-2-pentenal, and (2) subjecting said pentenal to a ring closure catalyzed by a halogen acid.