Two solvent process for preparation of esters of 3,5-dibromo-4-h

Details Two solvent process for preparation of esters of 3,5-dibromo-4-h Two solvent process for preparation of esters of 3,5-dibromo-4-h

1982-09-29

1984-03-13

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260465D, 260465F, C07C12175

Patent

active

044366655

ABSTRACT:
Esters of 3,5-dibromo-4-hydroxybenzonitrile can be prepared in high yields from 4-cyanophenol by reacting said phenol with preformed bromine chloride in 3% aqueous hydrogen bromide and then azeotropically distilling off the solvent/reaction medium with an aromatic hydrocarbon which then serves as the esterifying solvent medium for reaction with an acid halide. In this manner, both reactions can be accomplished without removing the product of the bromination reaction from the reaction vessel, i.e., a solids separation step is avoided.

REFERENCES:
patent: 3349111 (1967-10-01), Luckenbaugh
patent: 3397054 (1968-08-01), Hart et al.
patent: 3592626 (1971-07-01), Heywood et al.
patent: 3671556 (1972-06-01), Goldstick
patent: 4332613 (1982-06-01), Esposito
patent: 4349488 (1982-09-01), Dentel et al.
Product Review, "Bromine Chloride: An Alternative to Bromine", Jack F. Mills and John A. Schneider, The Dow Chemical Company, Midland, Mich., 48640.
Britton et al., Chemical Abstracts, vol. 47, p. 5437, (1953).

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