Patent · US Expired

Preparation of 3(5)-methylpyrazoles

US5484941A · kind A · utility

0Cited by

4References

9Claims

0Family size

Assignee

BASF SE

Inventors

Ralf Kaestner · Ludwigshafen, DE
Stefan Rittinger · Mannheim, DE
Peter Paessler · Neustadt, DE
Norbert Rieber · Mannheim, DE

Key dates

Filing date	May 6, 1994
Grant date	Jan 16, 1996
Priority date	—
Expiry date	May 6, 2014

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D231/12
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Process for the preparation of methylpyrazoles from diacetylene and hydrazines in which the diacetylene is removed from cracked gas by absorption and is then reacted with hydrazines.

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