Copper(I) complexes with the hexaazafulleroid C-60(NR)(6), derived from (2S,4S)-4-azido-1-benzyloxycarbonyl-2-(t-butylaminocarbonyl)pyrrolidine as multitopic ligand. Catalytic properties in oxidation of sulfides

Reactions in a molar ratio 1:6 of the hexaazafulleroid C-60(NR)(6) (1), der ived from the chiral azide (2S,4S)-4-azido-1-benzyloxy-carbonyl-2-(t-butyla minocarbonyl)pyrrolidine (2), with the copper(I) complexes [Cu(MeCN)(4)]ClO 4 and [CuCl(cod)](2) (cod = 1,5-cyclooctadiene) lead to the polymetallated species C-60[(NR)Cu(MeCN)(2)(ClO4)](6) (3) and C-60[(NR)CuCl(cod)](6). 2CuC l (4), respectively, which have been characterised by IR, H-1- and C-13-NMR spectroscopies and by mass spectrometry techniques (ES-, FAB- and MALDI-MS ). The performance of both complexes as catalysts in the oxidation of alkyl phenylsulfides [methylphenylsulfide, (2-ethylbutyl)phenylsulfide] was evalu ated. (C) 2001 Elsevier Science B.V. All rights reserved.