申请人:EASTMAN KODAK COMPANY
(a New Jersey corporation)
公开号:EP0134696A1
公开(公告)日:1985-03-20
A process for the preparation of 4-substituted-3-pyrazolidinones comprising reacting a 3-pyrazolidinone or 2-pyrazoline compound, blocked with a removable blocking group, with an electrophilic moiety at a temperature of equal to or less than 0°C in the presence of a strong base. The electrophilic moiety selectively adds to the 4-position of the compound, and the blocking group is thereafter removed, The 4-substituted-3-pyrazolidinones are useful as electron transfer agents in diffusion transfer photography.
一种制备 4-取代-3-吡唑烷酮的工艺,包括在强碱存在下,在等于或低于 0°C 的温度下,使用可去除的封端基团封端的 3-吡唑烷酮或 2-吡唑啉化合物与亲电分子反应。 亲电分子选择性地与化合物的 4-位相加,然后去除封端基团,4-取代-3-吡唑烷酮可用作扩散转移摄影中的电子转移剂。