The solid state structure of [b(10)h(11)](-) and its dynamic NMR spectra in solution.

The structure of [PPh(3)(benzyl)][B(10)H(11)] was determined at -123 degrees C and 24 degrees C by single-crystal X-ray analyses. The B(10) core of [B(10)H(11)](-) is similar in shape to that of [B(10)H(10)](2)(-). The 11th H atom asymmetrically caps a polar face of the cluster and shows no tendency for disorder in the solid state.

Synthesis and Structural Characterization of New Polyphosphorus Ring and Cage Compounds.

The 1:1 and 2:1 reactions of (Me(3)Si)(2)PLi.2THF with several amino chlorophosphanes have been surveyed. With (i)()Pr(2)NPCl(2), both reactant stoichiometries produce the four-membered ring compound (3) via different reaction schemes.