Isotelluroazolo[1,5-a]tellurazoles and processes for their prepa

Details Isotelluroazolo[1,5-a]tellurazoles and processes for their prepa Isotelluroazolo[1,5-a]tellurazoles and processes for their prepa

1986-08-04

1988-09-20

Daus, Donald G.

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

Organic compounds

430510, 350311, C07D51704, C07D51714, G03C 184

Patent

active

047727152

ABSTRACT:
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.

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