Process for the manufacture of cyclohexane-1,3-diones and 6-alky

Details Process for the manufacture of cyclohexane-1,3-diones and 6-alky Process for the manufacture of cyclohexane-1,3-diones and 6-alky

1975-10-10

1977-08-09

Morgenstern, Norman

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260586C, 260590C, C07C 4500, C07C 4518, C07D30930

Patent

active

040410498

ABSTRACT:
Cyclohexane-1,3-diones of the formula ##STR1## having up to 24 carbon atoms are prepared in admixture with 6-alkyl-3,4-dihydro-2-pyranones of the formula ##STR2## having up to 24 carbon atoms, in which formulae the radicals R and R' may be identical or different and represent each a hydrogen atom, an alkyl, a cycloalkyl or an aryl group each having up to 12 carbon atoms and the two radicals R' together optionally represent a --(CH.sub.2).sub.3 -group, by passing 4-oxocarboxylic acids of the formula ##STR3## having up to 24 carbon atoms and in which R and R' have the above meaning at a temperature of from 250.degree. to 500.degree. C in the gaseous phase over a dehydration catalyst and the pyranones are converted into cyclohexane-1,3-diones by passing them in the gaseous phase over a dehydration catalyst at a temperature of from 250.degree. to 500.degree. C.

REFERENCES:
patent: 3922307 (1975-11-01), Muller
patent: 3931322 (1976-01-01), Hengartner et al.
patent: 3932511 (1976-01-01), Schaafsma et al.
patent: 3950438 (1976-04-01), Schaafsma et al.
patent: 3953514 (1976-04-01), Yamazaki et al.
Mannich et al., "Ber", 71:2090-2091, (1938).
Bornstein et al., "Chem. Ab.", 48:9933e (1954).
Kost et al., "Chem. Ab.", 58:13808d, (1962).

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