| 摘要 |
NEW MATERIAL:A compound shown by formula I [group shown by formula II is (substituted) 7-norbornylidene; group shown by formula III is (substituted) aromatic hydrocarbon or unsaturated heterocyclic ring; R1 and R2 are H, alkyl, aralkyl, aryl or substituted amino]. EXAMPLE:A compound shown by formula IV. USE:A photochromic material reversely changing from a colorless state to a colored state by ultraviolet rays such as sunlight or mercury lamp and showing excellent durability. PREPARATION:A compound shown by formula V is reacted with a compound shown by formula VI preferably 1:10-10:1 (molecular ratio) in the presence of a condensation agent (e.g. pyrrolidine) at 0-200 deg.C. |
