| 摘要 |
NEW MATERIAL:The compound of formula I (R<1> is 1-6C alkyl; R<2> is 1-6C alkyl, cyclohexyl, etc. which may have lower alkoxy; X<1> is lower alkyl or halogen; X<2> is lower alkyl; n is 0, 1 or 2; R<1> and R<2> may together with N form pyrrolidino, piperidino, etc.). EXAMPLE:Spiro{ chromeno[ 2,3-C ]pyrazole-4( H )-1'-phthalan }-7-( N-ethyl-N-iso- pentyl)amino-3-methyl-1-benzyl-3'-one. USE:Useful as a color developing agent for recording materials such as pressure- sensitive copying paper, etc. If can be encapsulated without causing discoloration, and the encapsulated compound is resistant to discoloration with sunlight. The image obtained from the compound has extremely excellent resistance to light and water. PREPARATION:The compound of formula I can be produced by reacting the chromenopyrazole compound of formula II with the benzyl halide derivative of formula III (X is halogen), and recrystallizing the reaction product from an organic solvent. |
