Fulgides" is the name of succinic anhydrides with two substituted methylidene groups , at least one of which is a (substituted) arylmethylidene group. Fulgides show a photochromic property between open (colorless) and closed (colored) forms with no thermal transformation, and are therefore expected to be used as advanced optical photomemory materials. In this review , a brief history of research on fulgides , general synthetic methods with experimental details , general methods of photoreactions both in solutions and in matrices , methods of analysis of photoreactions to obtain quantum yields , and steric and electronic effects of substituents of fulgides on their photochromic properties , are described.
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Yokoyama et al. (1991) studied this question.