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United States Patent | 3,931,221 |
Meier , et al. | January 6, 1976 |
Anilinopyrazolone are to be prepared in high yields and with a high degree of purity by reacting a salt particularly hydrochloride of a .beta.-arylamino-.beta.-imino-propionic acid ester of one of the tautomeric formulae which are defined hereinafter with a suitable substituted hydrazine.
Inventors: | Meier; Ernst (Munich, DT), Glockner; Hans (Munich, DT), Kuffner; Karl (Unterhaching, DT), Boie; Immo (Cologne, DT), Nittel; Fritz (Cologne, DT) |
Assignee: |
Agfa-Gevaert Aktiengesellschaft
(Leverkusen-Bayerwerk,
DT)
|
Appl. No.: | 05/428,670 |
Filed: | December 27, 1973 |
Jan 04, 1973 [DT] | 2300221 | |||
Current U.S. Class: | 548/368.7 ; 544/60; 548/366.4 |
Current International Class: | C07D 231/00 (20060101); C07D 231/52 (20060101); G03C 7/384 (20060101); G03C 7/38 (20060101); C07D 231/20 () |
Field of Search: | 260/31A |
1,449,259 | Oct., 1965 | FR | |||
1,469,360 | Feb., 1966 | FR | |||
2,106,154 | Jan., 1972 | FR | |||
2,106,155 | Jan., 1972 | FR | |||
J Am. Chem. Soc., Vol. 71, pp. 983-988, (1949).. |