申请人:EASTMAN KODAK COMPANY
(a New Jersey corporation)
公开号:EP0076212A2
公开(公告)日:1983-04-06
A method for preparing a 1-aryl-3-arylamino-2-pyrazolin-5-one comprises reacting an N-aryl-3-arylamino-3- oximinopropionamide with an acylating agent in an inert solvent, then heating in contact with a strong acid catalyst and a dehydrating agent in an inert solvent, and then heating in contact with an acid in water and a lower alkanol. The 1-aryl-3-arylamino-2-pyrazolin-5-one may be used as a color-forming coupler or as an intermediate in preparing a color-forming coupler which produces a dye in a photographic element.
制备 1-芳基-3-芳酰胺基-2-吡唑啉-5-酮的方法包括在惰性溶剂中使 N-芳基-3-芳酰胺基-3-氧亚氨基丙酰胺与酰化剂反应,然后在惰性溶剂中与强酸催化剂和脱水剂接触加热,再在水中与酸和低级烷醇接触加热。1- 芳基-3-芳基氨基-2-吡唑啉-5-酮可用作成色耦合剂,或用作制备成色耦合剂的中间体,该成色耦合剂可在感光元件中产生染料。