Process for preparing michael addition products

Details Process for preparing michael addition products Process for preparing michael addition products

C - Chemistry, Metallurgy

07

C

C07C 69/34 (2006.01) C07C 67/343 (2006.01) C07C 67/347 (2006.01)

Patent

CA 2187759

Dialkyl malonate/alkyl acrylate Michael addition product mixtures at least three acceptor moieties in a substantial number of the molecules can be consistently prepared without the need for long reaction times of the use of a large excess of the acceptor when the reaction is effected by gradually adding one molar proportion of the dialkyl malonate to at least three molar proportions of an alkyl acrylate which has been preheated to 60-80 °C in admixture with an initiator and a phase transfer catalyst. In a preferred embodiment, the preheated mixture is maintained at 60-80 °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.

L'invention concerne des mélanges de produits d'addition de Michael à base de malonate de dialkyle / acrylate d'alkyle, qui comportent au moins trois fractions acceptrices dans un nombre important des molécules et dont la préparation homogène n'implique pas de temps de réaction longs ou l'utilisation d'un gros excédent de l'accepteur lorsque la réaction est effectuée par addition progressive d'une proportion molaire d'un malonate de dialkyle à au moins trois proportions molaires d'un acrylate d'alkyle préchauffé à une température comprise entre 60 et 80 ~C, en mélange avec une amorce et un catalyseur de transfert de phase. Dans un mode préféré de réalisation, le mélange préchauffé est maintenu à une température comprise entre 60 et 80 ~C pendant au moins une heure avant d'ajouter le malonate de dialkyle, de manière à augmenter le pourcentage du produit composé de constituants plus lourds.

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