Method for producing 1 substituted 5-chloro-4 methly pyrazoles

Details Method for producing 1 substituted 5-chloro-4 methly pyrazoles Method for producing 1 substituted 5-chloro-4 methly pyrazoles

2006-02-21

2006-02-21

Saeed, Kamal A. (Department: 1626)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C548S366100, C548S373100

Reexamination Certificate

active

07002023

ABSTRACT:
The present invention relates to a process for preparing 1-substituted 5-chloro-4-methylpyrazoles of the general formula Iwith the meaning for R stated in claim1, in which a 4-methylpyrazole of the formula IIis reacted with chlorine, the resulting mixture of monochlorinated and dichlorinated product is fractionated by distillation, and subsequently the dichlorinated compound is dehalogenated to compound II and returned to the reaction with chlorine.

REFERENCES:
patent: 3801584 (1974-04-01), Kubo et al.
patent: 6515139 (2003-02-01), Merkle et al.
patent: 586 903 (1987-05-01), None
patent: 350 176 (1990-01-01), None
patent: 350176 (1990-01-01), None
patent: 366 329 (1990-05-01), None
patent: 366329 (1990-05-01), None
Chemical Abstracts XP-002188366.

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