number of isomeric forms which may differ considerably in strain and hence in energy content. [20] Among the theoretical methods used for the calculation of the heat of formation of C,,, MM3 and the incremental method give the best results (both providing values which are slightly lower than the experimental ones), whereas the number resulting from MNDO calculations is much higher. From these comparisorls it can he concluded that the first two methods mentioned are best suited for the prediction of the heat of forrnatioii of higher fullerenes. Due to the lack of availability of these carbon spheres in quantities large enough for experimental measurements, knowledge about their stability will have to rely on theoretical calculations for some time.
Synthesis of Unsaturated Amino
S. Suniier in ( ' o i i i h i i \ i i~i C"i