Squaric acid esters

Details Squaric acid esters Squaric acid esters

1977-11-23

1979-06-26

Helfin, Bernard

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

Organic compounds

Carboxylic acid esters

560187, 560188, 560228, 560231, 260586R, 568598, C07C 4314, C07C 4318, C07C 4945, C07C 69145

Patent

active

041593871

ABSTRACT:
There are described new squaric acid esters, particularly mono-ortho esters, di-ortho esters, ortho ester anhydrides and ortho ester halides of squaric acid; a new process for producing these squaric acid esters; and a process for converting the squaric acid esters into squaric acid. It is possible by the new process to produce, with the use of readily obtainable starting products, the new squaric acid esters according to the invention in an economical manner and with good to very good yields; and the squaric acid esters can be converted under mild reaction conditions into squaric acid.

REFERENCES:
patent: 3059030 (1962-10-01), Park et al.
patent: 3288854 (1966-11-01), Martin
patent: 3819677 (1974-06-01), Gale
patent: 4092146 (1978-05-01), Fischer et al.
Ooms, Pieter J. J. et al., "Chemistry of Tetra-alkoxyethenes," Pts. VI & VII, J. Chem. Soc. (London), Perkin I (1976), pp. 1533-1538 & 1538-1543.

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