Patent · US Expired

Process for producing N-substituted 3-hydroxypyrazoles

US5922886A · kind A · utility

3Cited by

0References

3Claims

0Family size

Assignee

BASF SE

Inventors

Hartmann Konig · Heidelberg, DE
Norbert Gotz · Worms, DE
Ulrich Klein · Schifferstadt, DE
Karsten Eller · Stockach, DE

Key dates

Filing date	Jan 8, 1998
Grant date	Jul 13, 1999
Priority date	—
Expiry date	Jan 8, 2018

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D231/22
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

N-substituted 3-hydroxypyrazoles of the formula I ##STR1## where R.sup.1 is unsubstituted or substituted alkyl, aryl or heteroaryl and R.sup.2, R.sup.3 is hydrogen, cyano, halogen or unsubstituted or substituted alkyl, aryl or heteroaryl, are prepared by oxidation of a corresponding pyrazolidin-3-one with atmospheric oxygen in the presence of a metal salt in an essentially pH-neutral medium.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.