Patent ID: 6841668
Filing Date: 2005-01-11
Classification: C07D

Abstract:
1. A process for preparing a sterically hindered N-aryloxyamine of formula I, II, III, IV, V or VI which process comprises reacting a sterically hindered nitroxyl compound of formula VII, VIII, IX, X or XI  with a diazonium salt of an aromatic amine of formula XII, XIII or XIV  in the presence of a polyoxometalate of formula (1) or (2)  where M is W(VI) or Mo(VI); or each M is independently selected from W(VI), Mo(VI), V(V), Nb(V) and Ta(V); L is water; X is P, Si, Sn, Ge, As, B, Al, Zn, Co or Fe; M′ is a transition metal of Group 4, 5, 6, 7, 8, 9, 10, 11 or 12, or is a metaloid selected from Al, Si, Ga, Ge, Sn, Sb, Te and Pb; and Y is —CH R E G is chloro or —N(2-ethylhexyl) G R is hydrogen, alkyl of 1 to 18 carbon atoms, aralkyl 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, and R  where R, R