Patent ID: 7361755

Claim:
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 1 to R 4 are independently hydrogen, halogen, alkyl of 1 to 18 carbon atoms, aralkyl of 7 to 15 carbon atoms, aryl of 6 to 10 carbon atoms, alkylthio of 1 to 18 carbon atoms, alkoxy of 1 to 18 carbon atoms, aryloxy of 7 to 15 carbon atoms, or R 1 and R 2 together with the carbon atoms to which they are attached form a cycloalkylene of 5 to 18 carbon atoms or said cycloalkylene interrupted by 1 to 3 nitrogen, oxygen or sulfur atoms; or said cycloalkylene substituted by 1 to 3 halogen, alkyl of 1 to 18 carbon atoms, aralkyl of 7 to 15 carbon atoms, aryl of 6 to 10 carbon atoms, alkylthio of 1 to 18 carbon atoms, alkoxy of 1 to 18 carbon atoms or aryloxy of 7 to 15 carbon atoms, R 5 is hydrogen, alkyl of 1 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, aralkyl of 7 to 15 carbon atoms or aryl of 6 to 10 carbon atoms, R 6 and R 7 are independently alkyl of 1 to 8 carbon atoms, or R 6 and R 7 together are tetramethylene or pentamethylene, X is —CH 2 —, —O—, —S—, or —NR 8 —, R 8 is hydrogen or alkyl of 1 to 12 carbon atoms, 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 2 is alkylene of 2 to 12 carbon atoms and G is chloro or —N(2-ethylhexyl) 2 , wherein the silver is present in a catalytic amount and together with a Cu(II)/oxygen co-catalyst.