Patent · US Expired

Process for the preparation of aromatic carbonic diesters

US5354923A · kind A · utility

25Cited by

4References

10Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Norbert Schon · Krefeld, DE
Hans-Josef Buysch · Krefeld, DE
Eberhard Zirngiebl
Jurgen Kischkewitz · Ratingen, DE

Key dates

Filing date	Nov 7, 1991
Grant date	Oct 11, 1994
Priority date	—
Expiry date	Nov 7, 2011

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C68/06
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Carbonic diesters containing at least one aromatic ester group can be prepared from carbonic diesters containing at least one aliphatic ester group by transesterification using a phenol, titanium dioxide having a surface area of at least 20 m.sup.2 /g as determined by the BET method being used as catalyst.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.