Process for producing 2-halo-4-bromophenols

Details Process for producing 2-halo-4-bromophenols Process for producing 2-halo-4-bromophenols

1978-08-22

1980-07-01

Lone, Werren B.

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

Organic compounds

Oxygen containing

568774, C07C 3927, C07C 3928

Patent

active

042107660

ABSTRACT:
A process for the production of 2-halo-4-bromophenols of the formula ##STR1## in which X represents chlorine or bromine, is disclosed, which process comprises reacting a brominating agent with a 2-halophenol in the presence of a mixed catalyst consisting of a halide of zinc, iron, aluminium or cobalt, and a diphenyl sulfide of the formula ##STR2## in which R represents methyl or halogen, and n represents 0 to 3. The new process substantially avoids the formation of undesired 2,6-isomers and the 2-halo-4-bromophenols of the above formula are obtained in excellent yield and purity.

REFERENCES:
patent: 2452154 (1948-10-01), Ross
patent: 3449443 (1969-06-01), Dietzler
Anderson, "Chemical Periodicity," pp. 135 and 136, Reinhold Pub. Corp.
Webster, "Inter. Dictionary," 2nd Ed., p. 1194 (homology).
Ratford, et al., "J. Amer. Chemi. Soc.," vol. LV (1933), pp. 2125 to 2131.

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