Reversible Diels-Alder addition to fullerenes: a study of equilibria using (3)He NMR spectroscopy.
3He NMR spectroscopy has been used to study the equilibria of Diels-Alder additions of 9,10-dimethyl anthracene (DMA) to (3)He@C(60) and (3)He@C(70). Spectra of a series of equilibrium mixtures showed peaks for the isomeric adducts. One monoadduct, six bis-adducts, eleven tris-adducts, and ten tetrakis-adducts of DMA to C(60) were seen. One monoadduct and three bis-adducts of C(70) were detected. Equilibrium constants were found for these reactions and values for DeltaG, DeltaH, and DeltaS were obtained.
Wang
G W
GW
Contribution from the Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, USA.
Saunders
M
M
Cross
R J
RJ