| abstract |
NEW MATERIAL:The compound of formula I (R 2 WR 5 are 1W4C alkyl, halogen- substituted 1W2C alkyl, 1W4C alkoxy, halogen or nitro; l and an are 0W2; m and t are 0W4; R 1 is 1W20C alkyl, 3W10C cycloalkyl, 7W20C aralkyl or 6W14C aryl, any of which may have substituent group). n EXAMPLE: 1,3,3-Trimethylspiro{benz(g)indoline-2,3'-[3H]-naphtho[2,1b]-pyran}. n USE: A photochromic compound having high rate of color development and color dissipation. The absorption wavelength of color-developed compound is scarcely influenced by the kind of matrix and the compound has high fatigue resistance. It is used as a printing material, material for optical instrument, recording material, clothes or ornament. n PREPARATION: The compound of formula I can be produced by reacting a 2-methylenebenz(g)indoline compound of formula II with a hydroxynaphthaldehyde compound of formula III. n COPYRIGHT: (C)1987,JPO&Japio |