Process for preparing 2,4-dichloro-5-dichloromethyl-thiazole

Details Process for preparing 2,4-dichloro-5-dichloromethyl-thiazole Process for preparing 2,4-dichloro-5-dichloromethyl-thiazole

1988-09-14

1990-03-20

Gerstl, Robert

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D27720

Patent

active

049103164

ABSTRACT:
A process for preparing 2,4-dichloro-5-dichloromethyl-thiazole of the formula ##STR1## which comprises reacting 2,4-dichloro-5-thiazole-carboxaldehyde of the formula ##STR2## with thionyl chloride (SOCl.sub.2) in the presence of a halogenating catalyst at a temperature between 0.degree. C. and 100.degree. C. Preferred catalysts are aprotic organic nitrogen or phosphorus compounds. The products are directly obtained in high yield and purity so they can be directly used as bactericides or as intermediates for herbicides.

REFERENCES:
Potts, Comprehensive Heterocyclic Chemistry, vol. 6, p. 280 (1984).
Melvin S. Newman et al, "Conversion of Aromatic and .alpha.,.beta.-Unsaturated Aldehydes . . . ", J. Org. Chem., vol. 43 (1978), pp. 4367-4368.
Arthur J. Hill et al, "Studies on the Preparation of the Higher Acetylenes . . . ", J. Am. Chem. Soc., 50 (1928), pp. 172-177.

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