For first time dienes conjugated 8, 9 and 10 were synthesized with a s-cis
conformation, and Diels-Alder cycloaddition reactions between dienes synthe
sized and C-60 and C-70 were carried out, and the results obtained by NMR H
-1 and C-13 and elemental analysis demonstrated that the mono and biadduct
compounds were formated, diene 9 was more reactive than dienes 8 and 10. Fu
llerenes C-60 and C-70 did not presented any difference in their reactivity
like dienophiles.