US 11,655,202 B2
Process for preparing a cycloaliphatic diester
Alexander Meyer, Düsseldorf (DE); Thomas Pfingst, Tönisvorst (DE); and Dirk Hinzmann, Pulheim (DE)
Assigned to Covestro Intellectual Property GmbH & Co. KG, Leverkusen (DE)
Appl. No. 17/268,991
PCT Filed Aug. 14, 2019, PCT No. PCT/EP2019/071779
§ 371(c)(1), (2) Date Feb. 17, 2021,
PCT Pub. No. WO2020/035519, PCT Pub. Date Feb. 20, 2020.
Claims priority of application No. 18189636 (EP), filed on Aug. 17, 2018.
Prior Publication US 2022/0119334 A1, Apr. 21, 2022
Int. Cl. C07C 67/10 (2006.01); C08G 64/20 (2006.01); C08G 63/64 (2006.01); C07C 69/75 (2006.01)
CPC C07C 67/10 (2013.01) [C07C 69/75 (2013.01); C08G 63/64 (2013.01); C08G 64/20 (2013.01)] 18 Claims
1. A method for producing a cycloaliphatic diester of formula (Ia) or (Ib),

OG Complex Work Unit Chemistry
in which
A each independently is an aliphatic or aromatic radical and
n is a number between 0 and 3,
comprising the steps of
(i) reacting a mixture comprising at least one cycloaliphatic dicarboxylic acid and at least one aliphatic and/or aromatic carbonate, in the presence of a basic catalyst, to give a cycloaliphatic diester of formula (Ia) or (Ib) and
(ii) separating the cycloaliphatic diester of formula (Ia) or (Ib) from the mixture of method step (i) by means of distillation at a temperature of 180° C. to 280° C.