Method for preparing 1-aryl-3-arylamino-2-pyrazolin-5-ones from

Details Method for preparing 1-aryl-3-arylamino-2-pyrazolin-5-ones from Method for preparing 1-aryl-3-arylamino-2-pyrazolin-5-ones from

1981-09-28

1983-02-15

Jiles, Henry R.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548365, C07D23152

Patent

active

043742530

ABSTRACT:
A method for preparing a 1-aryl-3-arylamino-2-pyrazolin-5-one comprises reacting an N-aryl-3-arylamino-3-oximinopropionamide with an acylating agent in an inert solvent, then heating in contact with a strong acid catalyst and a dehydrating agent in an inert solvent, and then heating in contact with an acid in water and a lower alkanol.

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