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(a) N–N = bpy in EtOH/DMSO (15:1), reflux, 86%; (b) HPhbpy, cat. N-methylmorpholine in MeOH/H2O (5:1), reflux, 65%. For N–N = phen = 77% and 68%, N–N = dpq = 95% and 74%, N–N = dppz = 87% and 73%, NN = dppn = 96% and 65%.
