20-4; l l a , 132-64-9; Ilb, 101-84-8; 12, 92-84-2; 12a, 86-74-8; 12b, 122-39-4; 13, 92-85-3; benzene, 71-43-2; ethylenediamine, 107-1 5-3; 2,2'-bipyridyl, 366-18-7; hexamethylphosphorus triamide, 680-31-9; N,N,N,N'-tetramethylethylenediamine, 110-1 8-9; pyridine, 110-86-1; N,N'-dimethylpiperazine, 106-58-1; 1,8-bis(dimethylamino)naphthalene, 20734-58-1; 1 ,lophenanthroline, 66-7 1-7; 4-(dimethylamino)pyridine, 1 122-58-3.
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Pock et al. (1986) studied this question.