| 摘要 |
NEW MATERIAL:The 5-hydrazino-1H-pyrazole compound of formula I (Ar is aryl or 5-6-membered heteroaromatic group; X is H, halogen, cyano, alkoycarbonyl, aryloxycarbonyl or carboxyl; A is protonic acid; n is 0 or integer). EXAMPLE:3-Anilino-5-hydrazino-4-methoxycarbonylpyrazole. USE:An intermediate for 1H-pyrazole-type photographic coupler having substituent group at 6-site through N atom. PREPARATION:The compound of formula IV which is one of the compound of formula I wherein n is 0 can be produced e.g. by reacting the compound of formula II with HCl in the presence of NaNO2 and reducing the resultant compound of formula III. |
