A kinetic study of a few photochromic diarylnaphthopyrans is reported. Upon exposure to ultraviolet radiation, the diarylnaphthopyran derivatives are transformed into open chain, colored forms, which undergo ring closure into the colorless pyran forms. The rate of the ring closure has been determined for a few diarylnaphthopyrans. The effect of substituents on this reaction is briefly investigated.
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John J. Luthern (1997) studied this question.
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