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Abstract
The diphosphine (Me2N)2PCH2P(NMe2)2 reacts with the tetraamino macrocycle cyclen at about 100 °C in a closed system via cleavage of the P-C bond to yield cyclenphosphorane and bis(dimethyl-amino)methylphosphine. The presence of dimethylamine in this reaction is necessary, since a similar reaction which allows the amine to escape, produces an oligomeric product of formula [(C8H16N4)PCH2P]n.