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A ONE-STEP CLAISEN REARRANGEMENT PROCESS FOR THE PREPARATION OF CHROMENE DERIVATIVES
A ONE-STEP CLAISEN REARRANGEMENT PROCESS FOR THE PREPARATION OF CHROMENE DERIVATIVES
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机译:一步法制备氯衍生物的克莱森重排过程
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摘要
A series of novel photochromic spiropyrans are disclosed in which a spiro-adamantane group is introduced into the 2-position of the benzopyran or naphthopyran ring. The spiropyran compounds of the invention exhibit heliochromic properties, i.e. they colour in sunlight and fade rapidly at ambient temperatures in the absence of U.V. light, making them good candidates for use in the manufacture of sunglasses. The invention includes lenses which darken in sunlight and incorporate the novel spiropyrans and a process for the preparation of the spiropyran compounds.
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