Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Patent
1989-03-29
1991-05-14
Killos, Paul J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
562587, C07C 6966
Patent
active
050157604
ABSTRACT:
Preparation of glyoxylic acid or derivatives thereof of the formula ##STR1## in which R denotes an alkyl radical with 1 to 10 C atoms and R.sub.1 denotes an alkyl radical with 1 to 4 C atoms, by ozonolysis of a dialkyl maleate, in which the alkyl radicals each have 1 to 10 C atoms, with the equivalent amount of ozone in an aliphatic alcohol of the formula R.sub.1 OH, and subsequent catalytic hydrogenation, in which the ozonolysis product is continuously introduced into a suspension of the hydrogenation catalyst in the alcohol of the formula R.sub.1 OH such that the peroxide content of the hydrogenation solution is not more than 0.1 mole/liter during the hydrogenation. Glyoxylic acid can be obtained from the resulting acetals of the formula I by hydrolysis.
REFERENCES:
patent: 3145232 (1964-08-01), Thompson
patent: 3637721 (1972-10-01), Pappas
patent: 3705922 (1972-01-01), Callighan
CRC Handbook of Chemistry and Physics, 60th Ed. (1979-1980), CRC Press. p. D-149.
Deslongchamps, Pierre Stereoelectronic Effects in Organic Chemistry Pergamon Press (1983), pp. 41-471.
Chemie Linz Aktiengesellschaft
Killos Paul J.
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