Isotelluroazolo[1,5-a]tellurazoles and processes for their preparation
申请人:Eastman Kodak Company
公开号:US04772715A1
公开(公告)日:1988-09-20
Isotellurazolo[1,5-a]tellurazoles are disclosed. These heterocycles can be prepared by reacting a diarylformamidine with an aromatic tellurazolium salt which is substituted at its 2 ring position with a methine group precursor. The product heterocycles are useful directly for their blue light absorption and in forming stable heterocyclic nuclei containing compounds, such as a photographic addenda.
We describe the synthesis of a newheterocyclicsystem : the 1,3-benzotellurazole, and some of its substituted derivatives.
我们描述了一个新的杂环系统的合成:1,3-苯并二氢恶唑及其一些取代的衍生物。
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.