Additions with Preferred e- and cis-1 Modes The trans-1 Effect

2 Additions with Preferred e- and cis-1 Modes The trans-1 Effect 

Cycloadditions to [6,6]-double bonds of the fullerene framework are the most versatile and suitable reactions in fullerene chemistry. For a second attack to a 

Similar product distributions were observed for two-fold additions of diamines and for the formation of the tetrahydro[60]fullerenes [142]. 

For an interpretation of these experimental findings it is useful to distinguish between the properties of the reaction products 7-45 (bis-adducts) like their relative stabilities and the geometric and electronic structure of the precursor molecules 46-48 themselves. The AMI -calculated stabilities of various series of bis-adducts are listed in Table 4. 

Two important results arise from these calculations (1) in bis-adducts with two dialkoxycarbonylmethylene or diaryhnethylene groups the cfs-1-adducts are considerably less stable than the other isomers, which exhibit very similar AMI heats of formation, and (2) in bis-adducts with at least one imino addend the czs-1 -isomers are not destabilized compared to the others the cfs-1- and to a 

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