New mono- and polyazafulleroids C60(NR)n (n=1,2,4,6) derived from a chiral azide containing N- and O-donor groups, and reactivity with [RhCl(CO)2]2
作者:Marta Iglesias、Berta Gómez-Lor、Amelia Santos
DOI:10.1016/s0022-328x(99)00657-9
日期:2000.4
Reactions in a 1:1 molar ratio of the chiral azide (2S,4S)-4-azido-1-benzyloxycarbonyl-2-((t)butylaminocarbonyl)pyrrolidine (N3R, R = C17H23N2O3, 1) with C-60 in ClPh, in the temperature range 100- 132 degrees C, lead to mixtures of mono- and polyazafulleroid species of general formula C-60(NR)(n) (n = 1, 2, 4), with a composition depending on the reaction conditions, and with a yield in the most substituted polyazafulleroids that increases with the concentration of reactants. However the reaction in a 1:6 molar ratio (fullerene-azide 1) leads only to hexaazafulleroids C-60(NR)(6). AU mono- and polyazafulleroids C-60(NR)(n) react with [Rh(CO)(2)Cl](2) to give complexes of composition C-60(NR)(n)[Rh(CO)(2)Cl](n), which could be used as catalysts in asymmetric hydrogenation of prochiral olefins. (C) 2000 Elsevier Science S.A. All rights reserved.