Synthesis and photochromic properties of methoxy substituted 2,2-diaryl-2H-Naphtho1,2-bpyrans

摘要

A series of methoxy-substituted 2,2-di(4-methoxyphenyl)-2H-naphtho1,2-bpyrans has ben synthesised from 3-alkoxycarbonyl-1-naphtholsj and 1,1-di(4-methoxyphenyl)prop-2-yn-1-ol.The influence of the methoxy group on the wavelength of maximum absorption and the stability of the ring-opened naphthopyrans is discussed.