Process for the preparation of 4-bromonaphthalic acid anhydride

Details Process for the preparation of 4-bromonaphthalic acid anhydride Process for the preparation of 4-bromonaphthalic acid anhydride

1974-01-16

1976-05-04

Mars, Howard T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260515A, C07D31102

Patent

active

039548104

ABSTRACT:
A process for the preparation of 4-bromo-naphthalic acid anhydride by bromination of an alkali metal salt of naphthalic acid in an aqueous medium at a pH of 6.8 to 9 by dropwise adding 0.55 to 0.65 mol of bromine per mol of naphthalic acid and oxidizing the bromine at the same pH-value with chlorine. By this process 4-bromo-naphthalic acid anhydride can be obtained in a quantitative yield whereby the formation of 4-chloro-naphthalic acid is avoided.

REFERENCES:
patent: 2211465 (1940-08-01), Jewel et al.
patent: 2394268 (1946-02-01), Spencer
patent: 3163659 (1964-12-01), Sieber
Petrenko et al., Chem. Abst., 68, (1968).
Carpignano, Chem. Abst., 51 (1957).

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