Method of producing...

Details Method of producing... Method of producing...

2005-05-24

2005-05-24

McKane, Joseph K. (Department: 1626)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

06897322

ABSTRACT:
The invention relates to a method of preparing 1-alkyl-3-aryl-5-difluoromethoxy-1H-pyrazoles of the formula (I), wherein aryl represents a mono- or polysubstituted phenyl ring, and R1represents C1-C4alkyl. The inventive method is characterized by reacting, in a first reaction step, a β-ketoester of the general formula (II) with hydrazine and by successively reacting the reaction product obtained with chlorodifluoromethane and a compound R1-L, wherein R1has the meanings indicated above and L represents the leaving group of a nucleophilic displacement reaction.

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98-019962 Derwent Abst.

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