Dye intermediates and their preparation and use in the synthesis

Details Dye intermediates and their preparation and use in the synthesis Dye intermediates and their preparation and use in the synthesis

1969-01-24

1976-03-09

Randolph, John D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260240F, 2602404, 2602407, 2602409, 260307D, 260309, 260302F, C07D27764

Patent

active

039431428

ABSTRACT:
Compositions of matter are provided comprising a stable, non-vaporous monomeric methylene base selected from a 2-methylenethiazoline; a 2-methylenebenzothiazoline; a 2-methylenenaphthothiazoline; a 2-methylenebenzoselenazoline; and a 2-methylenenaphthoselenazoline. The compositions of the invention are prepared by reacting the parent 2-methyl quaternary salt with a non-hydroxylic base which removes a proton of the heterocyclic salt together with a proton acceptor which inhibits build-up of the hydro salt of the non-hydroxylic base, the reaction being conducted under anhydrous conditions in a non-hydroxylic liquid in which the heterocyclic quaternary salt is sufficiently insoluble to inhibit dimer formation. The compositions of the invention are employed in the preparation of methine dyes.

REFERENCES:
patent: 2921067 (1960-01-01), Larive et al.
Metzger et al., Bull. Soc. Chim., France 1967, pp. 40 to 46.
Vorsanger, Bull. Soc. Chim., France, 1968, pp. 964 to 970.

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