申请人:AGFA-GEVAERT
naamloze vennootschap
公开号:EP0295729A1
公开(公告)日:1988-12-21
Intramolecular nucleophilic displacement compound or a precursor thereof wherefrom during photographic processing useful group can be split off, said intramolecular nucleophilic displacement compound or precursor thereof corresponding to the following general structure (I):
wherein
Nu¹ represents a nucleophilic group e.g. HO, H₂N or HS, or a precursor of such nucleophilic group e.g. an oxidized nucleophilic group e.g. O= or HN=, or RO wherein R is an alkyl, an acyl, an aryl or a trialkylsilanyl group, which groups may be substituted, the said nucleophilic group or precursor thereof being located in adjacent position to C(R¹R²) so as to make possible elimination of PUG through a nucleophilic displacement reaction;
Ar represents an aryl group or a heteroaryl group (e.g. pyridine), which groups may be substituted by one or more mono-atomic or poly-atomic groups, e.g. alkyl groups, nitro groups, cyano groups, carboxy groups, or by substituents which, when in adjacent positions on the ring, together form a ring fused with the (hetero)aryl group, e.g. a benzene ring, a cyclohexane ring, a heteroannulated ring; Ar may comprise as substituent e.g. another nucleophilic group Nu² (same as or different from Nu¹);
each of R¹ and R² (same or different) represents hydrogen or an alkyl, an aryl or an aralkyl group which groups each may be substituted;
R³ represents an alkyl, an aralkyl, an alkyloxy, an aryloxy, an alkylthio, an arylthio, an amino group which groups each may be substituted, an oxy (O⁻) or a hydroxy group;
PUG is a group containing a hetero atom (selected from among N, S and O) through which it is attached to the phosphor atom and producing a photographically useful activity after cleavage of the bond between the hetero atom and the phosphor atom.
分子内亲核置换化合物或其前体,在照相处理过程中可从中分离出有用的基团,所述分子内亲核置换化合物或其前体对应于以下一般结构 (I):
其中
Nu¹ 代表亲核基团,如 HO、H₂N 或 HS,或此类亲核基团的前体,如氧化亲核基团,如O=或 HN=,或 RO,其中 R 是烷基、酰基、芳基或三烷基硅烷基,这些基团可被取代,所述亲核基团或其前体位于 C(R¹R²)的邻近位置,以便通过亲核置换反应消除 PUG;
Ar 代表芳基或杂芳基(如吡啶),这些基团可被一个或多个单原子或多原子基团取代,如这些基团可被一个或多个单原子或多原子基团取代,如烷基、硝基、氰基、羧基,或被在环上相邻位置时共同形成一个与(杂)芳基融合的环的取代基取代,如苯环、环己烷环、杂环;Ar 作为取代基可包括另一个亲核基团 Nu²(与 Nu¹ 相同或不同);
R¹ 和 R²(相同或不同)各自代表氢或烷基、芳基或芳烷基,这些基团均可被取代;
R³ 代表烷基、芳基、烷氧基、芳氧基、烷硫基、芳硫基、氨基(各基团可被取代)、氧基 (O-) 或羟基;
PUG 是含有杂原子(选自 N、S 和 O)的基团,通过该杂原子与磷原子相连,并在杂原子与磷原子之间的键断裂后产生对摄影有用的活性。