Enzyme-catalyzed reactions involving diphenyl carbonate
First Claim
1. A method for performing an exchange reaction with a diphenyl carbonate compound of the formula ##STR7## wherein each A is individually selected from the group consisting of hydrogen, lower alkyl groups, lower alkoxy groups, and halogens, comprising the reaction of the diphenyl carbonate compound with water or an alcohol in the presence of an enzymatic catalyst having an active site capable of binding the diphenyl carbonate while retaining a catalytic residue after binding.
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Abstract
Enzyme-catalyzed exchange reactions with diphenyl carbonate compounds are disclosed. Nucleophiles participating in these reactions include water and a wide range of hydroxy-containing compounds. Polycarbonate products can be prepared according to this invention by the use of various bisphenols in a transesterification reaction with the diphenyl carbonate compound.
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Citations
19 Claims
- 1. A method for performing an exchange reaction with a diphenyl carbonate compound of the formula ##STR7## wherein each A is individually selected from the group consisting of hydrogen, lower alkyl groups, lower alkoxy groups, and halogens, comprising the reaction of the diphenyl carbonate compound with water or an alcohol in the presence of an enzymatic catalyst having an active site capable of binding the diphenyl carbonate while retaining a catalytic residue after binding.
- 17. A method for the preparation of polycarbonates, comprising the transesterification of a diphenyl carbonate compound with a dihydric phenol in the presence of an enzymatic catalyst selected from the group consisting of Candida Cylindracea lipase, Porcine liver esterase, Rhizopus lipase, and Pseudomonas Fluorescens cholesterol esterase.
Specification