Patent ID: 8471031
Filing Date: 2013-06-25
Classification: C07B,C07D

Abstract:
1. A process for the preparation of a sterically hindered nitroxyl ether which comprises reacting a corresponding sterically hindered nitroxyl radical with a carbonyl compound in the presence of a hydroperoxide and a metal catalyst, with the proviso that, if the sterically hindered nitroxyl radical is 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO), the ketone is not acetone, where the carbonyl compound is an aldehyde, diketone, dialdehvde, oligoketone or oligoaldehyde and wherein the sterically hindered nitroxyl radical is selected from the group consisting of formulae (A)-(O) wherein G R m is 0 or 1; R R n is 1 to 4; when n is 1, R when n is 2, R when n is 3, R when n is 4, R p is 1 to 3; R when p is 1, R when p is 2, R when p is 3, R r is 1 to 4; when r is 1, R when r is 2, R when r is 3, R when r is 4, R R R R q is 2 to 8; R R R d is 0 or 1; h is 0 to 4; k is 0 to 5; x is 3 to 6; y is 1 to 10; z is an integer such that the compound has a molecular weight of 1000 to 4000 amu; R R R and R