The new skeletally stabilized dichlorotriphosphazanes C6H4N2(PhPCl)2PPh (5) and C6H4N2(MePCl)2PMe (6) have been prepared from reactions between PhPCl2 or MePCl2 and 1,2-(NH2)2C6H4 or 1,2-(Me3SiNH)2C6H4, respectively. Reaction of PhPCl2 with the phosphadiazole C2H4(Me3SiN)2PPh yields triphosphazane C2H4N2(PhPCl)2PPh (8). Compounds 5, 6, and 8 form as mixtures of three diastereomers; characterization is based on spectral data and derivatization of 5 and 8 to the amino and thio(amino) triphosphazanes C6H4N2[PhP(NHiPr)]2PPh (7) and C2H4N2[PhP(S)NEt2]2PPh (10). The 31P NMR spectra of 5 and 6 in solution have been measured as a function of temperature and solvent donor and dielectric strength. The solution properties of the dichlorotriphosphazanes and the implications of these on subsequent reaction chemistry are discussed.

Skeletal P-N-P unit conformational preferences of the unsymmetrically substituted bis(phosphino)amines erythro-¡-PrN[PhP(i-PrNH)][PhP(EtNH)] (4A), meso-and ¿,/-z-PrN[PhP(¡-PrNH)]2 (5A and SB), erythro-i--[PhP(z'-PrNH)] [PhP(z-BuNH)] ( 6), eryZAro-z-PrN[PhP(z-PrNH)][PhP(PhNH)] (7), and eryfAro-i-PrN[PhP-(PhNH)]2 (8) have been examined. Compound 8, newly prepared in this study, and the previously synthesized 4A and 5A have been characterized by X-ray single-crystal analysis: 4A, monoclinic, Pl\/n, a = 10.678(4) A, b =

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