3-Hydroxy-2-cyclobuten-1-one salts

Details 3-Hydroxy-2-cyclobuten-1-one salts 3-Hydroxy-2-cyclobuten-1-one salts

1991-02-21

1992-02-11

Ramsuer, Robert W.

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

Organic compounds

Amino nitrogen containing

564462, 564463, 564 1, 568381, 3 5C21163

Patent

active

050877569

ABSTRACT:
3-Hydroxy-2-cyclobuten-1-one salts of the general formula: ##STR1## wherein R is an ammonium group of the general formula: ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 are the same or different in meaning and each is a hydrogen atom, a lower alkyl group or a cycloalkyl group or R is an alkali metal atom. The salts according for formula I are obtained by the reaction of pure 3-acetoxy-2-cyclobuten-1-one, or 1,3-cyclobutanedione or a distillation residue of the diketene production containing 3-acetoxy-2-cyclobuten-1-one, with a base. The base can be an amine of the general formula: ##STR3## wherein R.sub.1, R.sub.2 , and R.sub.3 have the above-mentioned meaning, or an alkali metal alcoholate or an alkali metal hydroxide. The salts according to formula I are suitable for the production of squaric acid, by their being halogenated in a first step and then being hydrolyzed to squaric acid in a second step.

REFERENCES:
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