Crystal structure of 2-azido-1,3-bis­­(2,6-diiso­propyl­phen­yl)-1,3,2-di­aza­phospho­lidine

The title compound, C26H38N5P, was synthesized by reacting 2-chloro-1,3-bis­(2,6-diiso­propyl­phen­yl)-1,3,2-di­aza­phospho­lidine with sodium azide and a catalytic amount of lithium chloride in tetra­hydro­furan. The title compound is the first structurally characterized 2-azido-1,3,2-di­aza­phospho­lidine and exhibits a P atom in a trigonal pyramidal geometry. The azide P—N bond length of 1.8547 (16) Å is significantly longer than the P—N separations for the chelating di­amine [P—N = 1.6680 (15) and 1.6684 (14) Å]. The sterically hindered 2,6-diiso­propyl­phenyl groups twist away from the central heterocycle, with dihedral angles between the central heteocyclic ring and benzene rings of 76.17 (10) and 79.74 (9)°. In the crystal, a weak C—H⋯N link to the terminal N atom of the azide group leads to [100] chains.