Photographically useful chalcogenazoles, chalcogenazolines, and chalcogenazolinium and chalcogenazolium salts
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United States of America Patent
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Mar 18, 1986
Issued Date -
N/A
app pub date -
Oct 12, 1984
filing date -
Sep 6, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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 addenda in silver halide photographic systems.
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