Photographically useful chalcogenazoles, chalcogenazolines, and

Details Photographically useful chalcogenazoles, chalcogenazolines, and Photographically useful chalcogenazoles, chalcogenazolines, and

1985-10-03

1989-10-17

Brust, Joseph Paul

Organic compounds -- part of the class 532-570 series

Organic compounds

534701, 544 1, 544300, 544345, 546176, 546270, 548150, 548159, 548183, 548217, 548309, 548364, C07D29312

Patent

active

048748668

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 derivatives 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.

REFERENCES:
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patent: 2323503 (1943-07-01), Wilson
patent: 2323504 (1943-07-01), Wilsonh
patent: 2339094 (1944-01-01), Middleton et al.
patent: 3081170 (1963-03-01), Rauch et al.
patent: 3417082 (1968-12-01), Taylor
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patent: 4365016 (1982-12-01), Detty et al.
patent: 4365017 (1982-12-01), Detty et al.
patent: 4575483 (1986-03-01), Gunther et al.
patent: 4578348 (1986-03-01), Freeman et al.
patent: 4661438 (1987-04-01), Przyklek-Elling et al.
"Un Nouvel Heterocycle Tellure: le Benzisotellurazole-1,2", Campsteyn et al., Journal of Heterocyclic Chemistry, vol. 15, Aug. 1978, pp. 745-748, [with translation thereof].

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