N-(Trimethyl-sil-yl)methane-sulfonamide.

There are two mol-ecules in the asymmetric unit of the title compound, C(4)H(13)NO(2)SSi. In the crystal, mol-ecules are linked via inter-molecular N-H⋯O hydrogen bonds, forming chains along [001]. The crystal studied was an inversion twin, the refined ratio of twin domains being 0.

Reversible skeletal transmetalations of inorganic rings: isolation of aluminatophosphazenes, a zwitterionic phosphazene, and a donor-stabilized alumazine-phosphazene hybrid cation.

Synthesis of the cyclic aluminatophosphazene ring N(PCl2NMe)2AlMeCl (5) has been achieved via a skeletal transmetalation reaction between AlMe3 and the boratophosphazene N(PCl2NMe)2BCl2 (1). Reaction of 5 with various halogenated Lewis acids such as GaCl3 yielded the fully chlorinated aluminum heterocycle N(PCl2NMe)2AlCl2 (8) through a methyl-halogen exchange process. In contrast, treatment of 5 with excess AlMe3 resulted in complete methylation at aluminum to give N(PCl2NMe)2AlMe2 (6).

Bis(trichlorophosphine)iminium salts, [Cl3P=N=PCl3]+, with transition metal halide counter-ions.

The structures of four bis(trichlorophosphine)iminium [[Cl(3)P=N=PCl(3)](+); systematic name: trichloro[(trichlorophosphoranylidene)iminio]phosphorus(V)] salts, namely bis(trichlorophosphine)iminium hexachloroniobate, (Cl(6)NP(2))[NbCl(6)], (I), bis(trichlorophosphine)iminium hexachlorotantalate, (Cl(6)NP(2))[TaCl(6)], (II), bis(trichlorophosphine)iminium tri-micro-chloro-bis[trichlorotitanium(IV)], (Cl(6)NP(2))[Ti(2)Cl(9)], (III), and bis[bis(trichlorophosphine)iminium] di-micro-chloro-bis[tetrachlorozirconium(IV)], (Cl(6)NP(2))(2)[Zr(2)Cl(10)], (IV), have been determined. The P=N distances in the discrete [Cl(3)P=N=PCl(3)](+) moieties in structures (I), (II) and (IV) range from 1.5460 (14) to 1.

Reversible skeletal substitution reactions involving group 13 heterophosphazenes.

The cyclic boratophosphazene, N(PCl2NMe)2BCl2 1, reacts with two equivalents of AlMe3 to give the aluminatophosphazene heterocycle, N(PCl2NMe)2AlClMe 4. The unprecedented reverse skeletal substitution (Al for B) was accomplished by treating 4 with Ag[BF4] to form the fluorinated boratophosphazene N(PCl2NMe)2BF2 5.