Pyridazinone manufacture

Details Pyridazinone manufacture Pyridazinone manufacture

1989-09-13

1991-04-23

Shen, Cecilia

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

C07D23724

Patent

active

050101927

ABSTRACT:
Improved method for the manufacture of plant regulant pyridazine-4-one carboxylic acids, which comprises the step of decarboxylating a 4-oxo-3, 5-pyridazine dicarboxylic acid to give a 4-oxo-5-pyridazine carboxylic acid by treatment with 95-100% sulphuric acid at 160.degree.-180.degree. C. using a reactant; acid weight ratio of about 1:4 to 1:10.

REFERENCES:
patent: 4345934 (1982-08-01), Fujimoto
patent: 4623378 (1986-11-01), Durr et al.
patent: 4732603 (1988-03-01), Patterson
Patterson, Chem. Abst. 97-92301c (1982), EP 49,971.

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