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:
Jul. 17, 2001
Filed:
Nov. 24, 1998
Applicant:
Inventors:
Josef Metz, Marl, DE;
Clemens Osterholt, Dorsten, DE;
Assignee:
Huels Aktiengesellschaft, Marl, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C 6/730 ; C07C 6/974 ;
U.S. Cl.
CPC ...
C07C 6/730 ; C07C 6/974 ;
Abstract
The invention relates to a process for the C-alkylation of dialkyl malonates, in which a dialkyl malonate is reacted with an alkyl halide in the presence of potassium carbonate as a hydrogen halide acceptor in an inert solvent, and a phase-transfer catalyst is not added until from 50 to 80% of the dialkyl malonate has reacted. The phase-transfer catalyst may be, for example, a tetraalkylammonium salt or a tetraalkylammonium hydroxide, a tetraalkylphosphonium salt or a tetraalkylphosphonium hydroxide or a crown ether.