Patent · US Expired

Process for the preparation of 3-anilino-pyrazolones-(5)

US3956311A · kind A · utility

3Cited by

3References

1Claims

0Family size

Assignee

AGFA-Gervaert AG · DE

Inventors

Karl Kuffner · Unterhaching, DE
Ernst Meier · Munich, DE
Hans Glockner

Key dates

Filing date	Aug 8, 1973
Grant date	May 11, 1976
Priority date	—
Expiry date	Aug 8, 1993

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D231/48
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Preparation of 1-aryl-3-anilino-pyrazolones-(5) by reacting a hydrazine with an ester from the group of dialkoxyacrylic acid ester, trialkoxy propionic acid ester or iminoalkoxy propionic acid ester to produce a .beta.-hydrazine-.beta.-alkoxyacrylic acid ester and then condensing this intermediate product with an aniline to result in the desired anilinopyrazolone. These reactions are carried out in a methanolic solution in the presence of an acetic acid catalyst.

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