申请人:Eastman Kodak Company
公开号:US05019492A1
公开(公告)日:1991-05-28
A novel blocked photographically useful compound comprises a new blocking group that (a) comprises two electrophilic groups, the least electrophilic of which is bonded directly or through a timing group to the photographically useful group (PUG) of the compound, (b) is capable of reacting with a dinucleophile reagent, and (c) has the two electrophilic groups separated from each other by a bond or unsubstituted or substituted atom that enables nucleophilic displacement to occur with release of PUG when the compound is reacted with a dinucleophile reagent. Such a blocked photographically useful compound is useful in a photographic material and process to provide increased stability and enable more rapid release of the photographically useful group upon reaction with a dinucleophile reagent.
一种新的用于阻滞光学有用化合物的化合物包括一个新的阻滞基团,该阻滞基团具有以下特点:(a)包括两个亲电基团,其中最不亲电的基团直接或通过定时基团与化合物的光学有用基团(PUG)连接;(b)能够与二核亲核试剂发生反应;(c)两个亲电基团之间由键或未取代或取代原子分开,当该化合物与二核亲核试剂反应时能够发生亲核置换并释放PUG。这样的阻滞光学有用化合物可用于光学材料和工艺中,以提供增加的稳定性并使在与二核亲核试剂反应时更快地释放光学有用基团。