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:
Jun. 01, 1976
Filed:
Mar. 11, 1975
Gerrit E Beekhuis, Geleen, NL;
Leonardus H Geurts, Sittard, NL;
Stamicarbon B.V., Geleen, NL;
Abstract
The compounds ##EQU1## wherein each of R.sub.1 and R.sub.2 is H or alkyl of 1 to 5 carbon atoms, a cycloalkyl group of 5 to 10 carbon atoms or R.sub.1 and R.sub.2 bonded together through two adjacent carbon atoms form a saturated cycloaliphatic ring of 5 to 12 carbon atoms, are prepared by step (1) reacting acrylonitrile with isobutyraldehyde in the liquid phase to form 2,2-dimethyl-4-cyanobutyraldehyde and step (2) by reacting 2,2-dimethyl-4-cyanobutyraldehyde with a carbonyl compound of the general formula ##EQU2## wherein R.sub.1 and R.sub.2 are as defined above, wherein step (a) and step (b) are undertaken in the presence of a catalyst which is piperidine or a primary amine and/or a Schiff base and in the presence of an acid compound.