Process for the preparation of acid esters
AssigneeCrompton Corporation
InventorsWilliam Palmer Enlow, Carloss La Verne Gray, Vaikunth Sitaram Prabhu
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Abstract
The present invention is directed to a process for the preparation of sterically hindered acid esters, e.g., organic phosphites, comprising contacting a sterically hindered hydroxyl-containing compound with an acid halide in the presence of an acid acceptor selected from the group consisting of: 1,5-diazabicyclo[4.3.0]non-5-ene (DBN), 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), 4-(dimethylamino)pyridine (DMAP), 1,4-diazabicyclo[2.2.2]octane (DABCO), or mixtures thereof, wherein said an acid acceptor is present in an amount sufficient to drive the reaction to completion.
Claims15
A process for preparing sterically hindered acid esters comprising:
- a. reacting a sterically hindered phenol with an acid halide in the presence of an acid acceptor for a conversion rate of at least 90%, said acid accepter is selected from primary amine, secondary amine, and tertiary amine;
- b. further reacting said sterically hindered phenol with said acid halide in the presence of a cyclic amine acid acceptor selected from the group consisting of:
- 1,5-diazabicyclo[4.3.0]non-5-ene (DBN), 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), 4-(dimethylamino)pyridine (DMAP), 1,4-diazabicyclo[2.2.2]octane (DABCO), and mixtures thereof, wherein said cyclic amine acid acceptor is present in an amount sufficient to drive said reaction to at least 98% completion.
Dependencies are inferred from the claim text.