Process for preparing Michael addition products

Details Process for preparing Michael addition products Process for preparing Michael addition products

1993-12-20

1994-09-13

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560202, C07C 6934, C07C 6938, C07C 67465, C07C 6700

Patent

active

053470435

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.

REFERENCES:
patent: 2396626 (1946-03-01), Wiest et al.
patent: 4595717 (1986-06-01), Patzschke et al.
patent: 5219958 (1993-06-01), Noomen et al.
Tsushima et al., Tetrahedron, 44(17), pp. 5375-5387 (1988).
Quast et al., Liebigs. Ann. Chem., pp. 1305-1308 (1991).

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