| abstract |
PURPOSE: To improve the durability in repeated photochrominism by coupling a specific indolenine derivative with a specific nitroso-hydroxy derivative. n CONSTITUTION: An indolenine derivative of formula IV is obtained by reacting an amine derivative of formula I (wherein R f is F or a polyfluoroalkyl; m≥2, ring A is an aromatic hydrocarbon ring that may be substituted by R f and other groups or an aromatic heterocyclic ring), a hydrazine derivative of formula II obtained by diazotizing and reducing the amino derivative and a ketone of formula III (wherein R 2 to R 4 are each H, a 1-25C hydrocarbon group, alkoxy, halogen, ester, cyano, nitro, ((thio)ether, etc.), followed by the Fischer indole reaction. Then, a nitroso-hydroxy derivative of formula VI is obtained by nitrosating a hydroxy compound of formula V (wherein ring B is identical to ring A). Subsequently, the indolenine derivative is made to react with a compound of formula VII (wherein X is SO 3 C 6 H 4 CH 3 ; R 1 is identical to R 2 ) and then with the nitroso-hydroxy derivative to obtain a photochromic material. n COPYRIGHT: (C)1992,JPO&Japio |