C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/315.3
C07D 231/12 (2006.01) C07D 231/06 (2006.01)
Patent
CA 1164878
A B S T R A C T O F T H E D I S C L O S U R E Process for the Preparation of pyrazole, Process for the preparation of pyrazole by heating a pyrazoline derivative of the general formula Image (I) in which R represents an optionally substituted phenyl radicals or an alkyl or halogeno= alkyl radical, without the addition of an acid or base, at a tempera- ture between 100 and 200°C under a pressure between 1 mbar and 10 bars r optionally in the presence of a diluent. Le A 20 592
386228
Ditgens Klaus
Heinemann Ulrich
Lantzsch Reinhard
Thomas Rudolf
Weber Erhard
Aktiengesellschaft Bayer
Fetherstonhaugh & Co.
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