| 摘要 |
NEW MATERIAL:A compound expressed by formula I (n is an integer 1-4; R<1> is H, halogen, alkl, etc.; R<2> is H, halogen, alkyl or alkoxyl; R<3> is alkyl). USE:A compound, having photochromic property, useful as various recording and memorizing materials, copying materials, printing photosensitive materials, photosensitive materials for laser, photosensitive materials for photocomposition or optical filters and masking materials, etc., and capable of giving compositions repeadting color formation and decolorization in deep color of good stoage stability due to improved compatibility and solubility in high polymers. PREPARATION:A compound expressed by formula II is reacted with a compound expressed by formula III, and the resultant compound is then reacted with a compound expressed by formula IV to afford the aimed compound expressed by formula I. The above-mentioned reaction proceeds preferably in the absence of a solvent at 130-150 deg.C in the former, and in ethanol, methyl ethyl ketone or acetone in the presence of piperidine catalyst at 40-120 deg.C in the latter. |
