| 摘要 |
NEW MATERIAL:The compound of formula I (n is 1-4; R<1> is alkyl; R<2>-R<5> are H, halogen, alkyl, alkoxy or alkoxycarbonyl). EXAMPLE:The compound of formula II. USE:Various recording and memory materials, copying materials, photo-sensitive materials for printing use, materials sensitive to laser beam, photosensitive materials for phototypography, optical filters, masking materials, actinometer, materials for display, etc. It has photochromic property. PREPARATION:The 2,3,3-trimethylindolenine derivative of formula III is made to react with p-toluenesulfonic acid ester of formula IV at 130-150 deg.C preferably in the absence of solvents and the reaction product is made to react with the 1-nitroso-2-naphthol derivative of formula V in a solvent (preferably ethanol, etc.) in the presence of piperidine catalyst at 40-120 deg.C.
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