| 摘要 |
Compounds of the formula I are suitable as release compounds for photographically useful groups (photographic units). On reacting with nucleophilic reagents, preferably with dinucleophiles, the photographically useful group is released. <IMAGE> (I) In formula I: PUG means a photographically useful group; A means a strong electron acceptor; V means a vinylene group or two or more successive vinylene groups, wherein the vinylene group or two successive vinylene groups may form part of an aromatic ring system; L means one or more timing groups; m means 0 (zero) 1 or 2; n means 0 (zero), 1 or 2; R1 means H or methyl; R2 means H, alkyl with 1-18 C atoms or aryl; R3, R4 mean H or an organic group, wherein R2 and R3 may also together mean the residue necessary to complete a ring.
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