Process for preparing Michael addition products
US5347043A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1993 |
| Grant date | Sep 13, 1994 |
| Priority date | — |
| Expiry date | Dec 20, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C67/343
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Dialkyl malonate/alkyl acrylate Michael addition product mixtures having at least three acceptor moieties in a substantial number of the molecules can be consistently prepared without the need for long reaction times or the use of a large excess of the acceptor when the reaction is effected by gradually adding one molar proportion of a dialkyl malonate to at least three molar proportions of an alkyl acrylate which has been preheated to 60.degree.-80.degree. C. in admixture with an initiator and a phase transfer catalyst. In a preferred embodiment, the preheated mixture is maintained at 60.degree.-80.degree. C. for at least one hour before the dialkyl malonate is added in order to increase the percentage of product composed of the heavier components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.