10.8 (T,= 0.2" C), and 10.5 kcal/mol (T,=-5.2" C), respectively. At lower temperatures, the three conformations of the heptamethylene bridge were frozen. Methylpyridinium iodides 10 (n= 7, 6, and 5) derived from 6 were reduced more easily [E1p (half height potential)=-1.65 V (n= 7);-1.63 V (n= 6);-1.29 V vs Ag/AgCl (n= 511 than the reference compound, 2, 4-diethyl-5- (N, N-tetramethylenecarbamoy1) pyridinium ion (1 1)[Elp=-1.82 V vs Ag/AgCll. The ...
