Process for the production of squaric acid

Details Process for the production of squaric acid Process for the production of squaric acid

Filed on

1991-02-07

Date issued

1992-07-14

Examiner

Reamer, James H.

Patent Class

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

SubClass

Organic compounds

SubSubClass

Oxygen containing

Other Related Categories

568346, 568381, C07C 4543

Type

Patent

Status

active

Patent number

051304929

Description

ABSTRACT:
A process for the production of squaric acid by halogenation either of pure 3-acetoxy-2-cyclobuten-1-one or of a distillation residue of diketene production containing 3-acetoxy-2-cyclobuten-1-one to a cyclobutenone of formula: ##STR1## and then hydrolysis of these cyclobutenones to squaric acid. The halogenated cyclobutenones are intermediate products in the process.

REFERENCES:
patent: 3288854 (1966-11-01), Martin
patent: 3456010 (1969-07-01), Megson et al.
patent: 4159387 (1979-06-01), Bellus
Chemical Abstracts, 85:176885 m.
Chemical Abstracts, 94:139270x.
Chemical Abstracts, 63:11373h.
Schmidt, A. H., and Ried, W., Synthesis, (1978), pp. 869 to 880.
Paine, A. J., Tetrahedron Letters, (1984), 25, pp. 135 to 138.
Silvestri, G., et al., Gass. Chim. Itl., (1972), 102, pp. 818 to 821.
Uehara, A., and Tsuchiya, R., Sci. Rep. Kanazawa Univ., (1980), 25, p. 83.
Bellus, D., et al., Helv. Chim. Acta, (1978), 61, p. 1784.
Fabre. P. L., et al., Bull. Soc. Chim. Fr., (1988), p. 933.

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