Preparation of 3-bromo-4-fluorobenzaldehyde and its acetals

Details Preparation of 3-bromo-4-fluorobenzaldehyde and its acetals Preparation of 3-bromo-4-fluorobenzaldehyde and its acetals

1981-06-26

1983-05-17

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

564142, 564183, 568436, 568592, C07C12152, C07C 43313, C07C 4755, C07C10322

Patent

active

043839495

ABSTRACT:
A process for the preparation of a 3-bromo-4-fluorobenzaldehyde acetal of the formula ##STR1## in which R.sup.1 is methyl or ethyl,
which comprises reacting a 3-bromo-4-fluoro-benzoic acid halide with ammonia to form 3-bromo-4-fluoro-benzoic acid amide, dehydrating said amide to form 3-bromo-4-fluoro-benzonitrile, reacting the nitrile with formic acid in the presence of a catalyst at a temperature between about 0.degree. and 150.degree. C. to form 3-bromo-4-fluorobenzaldehyde, and reacting said aldehyde with R.sup.1 OH or a derivative thereof capable of forming an acetal. The amide and nitrile are new compounds. The acetals are known intermediates in the synthesis of pyrethroid-like insecticides.

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