Internal motions in a fulleropyrrolidine tertiary amide with axial chirality.
The kinetic parameters for topomerization around the N-CO bond and enantiomerization around the C-CO bond in N-1-naphthoyl fulleropyrrolidine 1 and N-1-naphthoyl pyrrolidine 2 have been determined by dynamic NMR (line shape simulation and selective inversion transfer). The DeltaS(not =) values are negligible. The DeltaH# value for topomerization of 1 is smaller with respect to that of 2 by 4.3 kcal mol(-1) (explained by the electron-withdrawing effect of fullerene) and the value for enantiomerization is greater by 1.4 kcal mol(-1) (explained by the greater rigidity of the fulleropyrrolidine ring, as confirmed by ab initio analyses).
Dipartimento di Studi di Chimica e Tecnologia delle Sostanze Biologicamente Attive, Università di Roma "La Sapienza", P. le A. Moro 5, 00185 Roma, Italy.
Giuseppe
G
Borsato
Federico Della
FD
Negra
Francesco
F
Gasparrini
Domenico
D
Misiti
Vittorio
V
Lucchini
Giorgia
G
Possamai
Claudio
C
Villani
Alfonso
A
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