The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 13, 1976
Filed:
Mar. 11, 1974
Sijbrandus E Schaafsma, Beek, NL;
Johannes E Claassens, Heerlen, NL;
Egidius J Verheijen, Sittard, NL;
Stamicarbon B.V., Geleen, NL;
Abstract
Process for the preparation of cyclohexane-1,3-diones of the formula ##SPC1## Wherein R.sub.1 -R.sub.8, which are the same or different, are each hydrogen or an alkyl group containing up to 6 carbon atoms and the total number of carbon atoms of R.sub.1 -R.sub.8 is not more than 12 carbon atoms, comprising contacting in the gaseous state a delta-keto ester of the formula ##EQU1## wherein R.sub.1 -R.sub.8 are as defined above and R.sub.9 is an alkyl, cycloalkyl, or monocyclic or bicyclic arylalkyl or aryl group containing up to 12 carbon atoms, with a thermally stable solid material having an internal surface area of from about 100 tot 1500 m.sup.2 /gm. at a temperature of from 100 .degree.C to 500 .degree.C.