Process for the production of heterocyclic compounds

Details Process for the production of heterocyclic compounds Process for the production of heterocyclic compounds

C - Chemistry, Metallurgy

07

D

260/237.2, 260/3

C07D 273/00 (2006.01) C07D 315/00 (2006.01) C07D 321/00 (2006.01) C07D 323/00 (2006.01)

Patent

CA 1103243

ABSTRACT OF THE DISCLOSURE A process is provided for the continuous or semi-continuous pro- duction of hetero-macrocyclic compounds including lactones and cyclic ex- ters. The process involves the catalyzed depolymerization of a linear polyester at an elevated temperature and under reduced pressure in the presence of a specified amount of monocarboxylate moieties and while pro- viding top-to-bottom mixing throughout essentially the total volume of the reaction mass. The agitation is accomplished by conducting the depolymeri- zation in an inverted multiple-blade conical vessel wherein the blades have a helical configuration and are arranged to rotate throughout essentially the entire reaction mass and in close proximity to the interior surface of the conical vessel and in a direction which provides a downward flow within the reaction mixture. The process prepares such macrocyclic compounds of good quality while minimizing the formation of undesirable by-products.

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