Limited photochromism in covalently linked double 1,2-dithienylethenes

Abstract

Only one photo-induced cyclization reaction occurs when two 1,2-dithienylethene photochromes are covalently joined. Attempts made to ring-close the second photochrome by prolonged irradiation quantitatively produced a rearranged product that could not be photobleached. Copyright © 2000 John Wiley & Sons, Ltd.