The macrocyclic polyamine 1,4,7-trimethyl-1,4,7,10-tetraazacyclododecane [LH = (MeTACD)H] formed adducts with tetramethyl-silazides [M{N(SiHMe)}] (M = Li, Na, K) of light alkali metals. Upon heating, intramolecular dehydrocoupling occurred to give [M{(L)SiMeN(SiHMe)}]. BPh induced facile ring-opening of THF when reacted with [Li{(L)SiMeN(SiHMe)}].
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