| 摘要 |
<p>-a- NOVEL ELECTRON DONOR PRECURSORS AND PHOTOGRAPHIC ELEMENTS CONTAINING THEM Novel electron donor precursors have the structure: where: R is an alkali labile group; Y is an aliphatic or aromatic group; and Z is an electron withdrawing group. The compounds are useful in photographic elements, film units and processes to provide electrons to immobile compounds which must accept at least one electron before releasing a diffusible dye or photographic reagent.</p> |
