Quaternized tellurium salt fog inhibiting agents for silver halide
申请人:Eastman Kodak Company
公开号:US04661438A1
公开(公告)日:1987-04-28
Radiation sensitive silver halide photographic elements are disclosed which are protected from fog by quaternized aromatic oxatellurazinium salts. The aromatic oxatellurazinium salts can be initially incorporated in the photographic element as manufactured or during processing.
Photographically useful chalcogenazoles, chalcogenazolines, and
申请人:Eastman Kodak Company
公开号:US04576905A1
公开(公告)日:1986-03-18
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.
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.
Synthesis of Diaryl Tellurides with Sodium Aryltellurites under Mild Conditions
作者:Shan Li、Yuan Cao、Lvqi Jiang、Jie Liu
DOI:10.1002/asia.202300993
日期:2024.4.2
efficient new protocol has been developed for the formation of C−Te bonds, leading to both symmetrical and unsymmetrical diaryl tellurides. This protocol utilizes sodium aryltellurites, which can be easily prepared from low-cost aryltelluride trichlorides and NaOH. The synthesis involves the use of sodium aryltellurites and arylazo sulfones as starting materials in the presence of (MeO)2P(O)H. A variety