The syntheses of all sixteen CB11(CH3)n(CD3)12-n� radicals with fivefold substitution symmetry are described.  The variation in the width of their broad and featureless EPR signals is used to deduce the relative values of the average hyperfine coupling constants aH of the hydrogen atoms in the ipso (1), ortho (2-6), meta (7-11), and para (12) methyl groups: aH(i) : aH(o) : aH(m) : aH(p) = (0.5 � 5.8) : (1.5 � 1.3) : (3.6 � 0.5) : (1.6 � 6.3).  The values are in fair agreement with the results of a B3LYP/EPRII calculation.

Sixteen CB11(CH3)n(CD3)12-n� radicals with fivefold substitution symmetry: Spin distribution in CB11Me12�

244th National Meeting (2012)

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