Patent ID: 7361755
Filing Date: 2008-04-22
Classification: C07D,C08K

Abstract:
1. A process for preparing a sterically hindered amine of formula I, II, III, IV, V or VI which process comprises reacting a corresponding sterically hindered nitroxyl compound of formula Ia, IIa, IIIa, IVa or Va with an alkylborane of formula or reacting two equivalents of the sterically hindered nitroxyl of formula Ia with a cyclic or bis alkylborane of formula in the presence of silver, wherein n is 1 to 3, R is hydrogen, alkyl of 1 to 18 carbon atoms, aralky of 7 to 15 carbon atoms, aryl of 6 to 10 carbon atoms, hydroxyl, carboxyl, amino, alkylamino of 1 to 18 carbon atoms, dialkylamino of 2 to 36 carbon atoms, oxo, alkylthio of 1 to 18 carbon atoms, alkoxy of 1 to 18 carbon atoms, aryloxy of 7 to 15 carbon atoms, benzoyloxy, alkylcarbonyloxy of 2 to 18 carbon atoms or alkylcarbonylamino of 2 to 18 carbon atoms, R or R R R X is —CH R Q is a direct bond or is methylene of 1 to 12 carbon atoms or said methylene interrupted by 1 or 2 nitrogen, oxygen or sulfur atoms, E G is chloro or —N(2-ethylhexyl) wherein the silver is present in a catalytic amount and together with a Cu(II)/oxygen co-catalyst.