| 摘要 |
NEW MATERIAL:The compound of formula I (Ar is aryl to which at least one sulfonic acid group is bonded directly or through a bivalent linking group). USE:A synthetic intermediate for light-absorbing dye for photographic industry. PREPARATION:The compound of formula I can be produced by reducing a hydrazone compound obtained by the reaction of a benzaldehyde derivative with hydrazine. The compound of formula I can be converted to pyrazolones of formula V (Z1 is -COOR, -CONR'R'', -OR, etc.) by reacting with a compound of formula II [X is -OR or -NR'R'' (R is alkyl, aryl or aralkyl; R' and R'' are H, alkyl, aryl, aralkyl, etc.); Y is -COOR, -CONR'R'', -SO2R, alkyl, etc.], a compound of formula III (A is -OR, -NR'R'', -NHCOR, etc.; B is -OR, -SR or -NR'R'') or a compound of formula IV. |
