Compounds containing an aromatic ring portion fused with a tellurazolium or derivative tellurazole, tellurazoline (including tellurazolinylidene), or tellurazolinium ring portion are disclosed together with processes and intermediates for their preparation. With properly selected pendant groups these tellurazolium and derivative compounds can be usefully employed as dyes, antifoggants or stabilizers, nucleating agents, latent image keeping addenda, or speed or contrast altering addends in silver halide photographic systems.
本发明公开了含有芳香环部分与
碲唑啉或衍生
碲唑烯、
碲唑啉(包括
碲唑啉基)或
碲唑啉环部分融合的化合物,以及其制备的过程和中间体。通过正确选择的侧链基团,这些
碲唑啉和衍生化合物可以作为
染料、防雾剂或稳定剂、成核剂、潜影保持添加剂,或在卤化
银摄影系统中作为速度或对比度改变添加剂有用地应用。