New P-S-N containing ring systems. Reaction of 2,4-(naphthalene-1,8-diyl)-1,3,2,4-dithiadiphosphetane 2,4-disulfide with methylbis(trimethylsilyl)amine

From the reaction of 2,4-(naphthalene-1,8-diyl)-1,3,2,4-dithiadiphosphetane 2,4-disulfide 1 with methylbis(trimethylsilyl)amine 2 in dichloromethane a product of the P2S2 ring cleavage, (C10H6)P(S)(SSiMe3)(mu-S)P(S)(NMeSiMe3) 3, was isolated, existing in an equilibrium between two diastereomeric for ms in solution. Compound 3 was also obtained when toluene was used as a sol vent. Its subsequent reaction with pyridine (py) led to the desilylated ion ic product [Hpy(+)][(C10H6)P(S)(NHMe)(mu-S)PS2-] 4, which reacts with tetra phenylphosphonium chloride to give [PPh4+][(C10H6)P(S)(NHMe)(mu-S)PS2-] 5. When acetonitrile was used as a solvent a cage compound 2,6-(naphthalene-1, 8-diyl)-3,4-dimethyl-1,3,5,2 lambda(5),6 lambda(5)-thiadiazadiphosphinine 2 ,6-disulfide 6 containing a six-membered CN2P2S heterocycle was obtained. T he new compounds were studied spectroscopically (1- and 2-D high resolution NMR, IR, MS) and in the cases of 3, 5 and 6 by X-ray crystallography.