Synthesis and NMR Spectra of λ5-Diphosphets. Structure of 2,4-Diphenyl-1,1,3,3-tetrakis (diethylamino)-1λ5, 3λ5-diphosphete Preparation, properties, and n.m.r. spectra of C2H5PF2[N(C2H5)2]2, CH2?PF[N(C2H5)2]2, and the diphosphetes {RC?P[N(C2H5)2]2}2 (R) ? H ( 5a ), CH3 [( 5b )] are described. The λ5-diphosphete {HC?P(NR2)2}2 (R ? CH3) reacts with BF3 · O(C2H5)2 to give which is transformed into by n-C4H9Li. The crystal and molecular structure of 2,4-diphenyl-1,3,3-tetrakis(diethylamino)-1λ5,3λ5-diphosphete 2 are reported and discussed.
