(19)

(11)

EP 0 487 714 A1

(12)

(43) Date of publication: 03.06.1992 Bulletin 1992/23 (21) Application number: 91912726.0 (22) Date of filing: 20.06.1991

(51) International Patent Classification (IPC):  B01J 27/ 08( . ) C07B 37/ 04( . ) C07C 6/ 12( . ) C07C 41/ 22( . ) C07C 41/ 30( . ) C07C 43/ 215( . ) B01J 31/ 02( . ) C07B 61/ 00( . ) C07C 15/ 24( . ) C07C 41/ 24( . ) C07C 43/ 20( . ) C07C 43/ 225( . ) (86) International application number: PCT/US1991/004461 (87) International publication number: WO 1992/000260 (09.01.1992 Gazette 1992/02)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 26.06.1990 US 19900544272 16.08.1990 US 19900568581 (71) Applicant: AMOCO CORPORATION Chicago, IL 60680-0703 (US)

(72) Inventors: McMAHON, Patrick, Edward Wheaton, IL 60187 (US) PALMER, David, Asael Naperville, IL 60563 (US) HAGEN, Gary, Peter West Chicago, IL 60185 (US) ERNST, Andreas, Bernd Glen Ellyn, IL 60137 (US) SMITH, Thomas, Gordon Naperville, IL 60540 (US) CHANG, Wen-Dong Naperville, IL 60563 (US) SCHAFFHAUSEN, John, Gregory Naperville, IL 60564 (US) POURREAU, Daniel, B. Downington, PA 19335 (US) (74) Representative: Ritter, Stephen David, et al  Mathys & Squire 100 Grays Inn Road London WC1X 8AL London WC1X 8AL (GB)