Search

Addition of chiral shift reagent (CSR) or chiral solvating agent (CRA) to separate meso and racemic forms of some diastereoisomeric single-bridged cyclophosphazene compounds causes doubling of 31P NMR signals for both isomers. The anomalous behavior on addition of CSR/CSA is only found for meso forms of cyclophosphazene compounds.

The reinvestigation of the molecular structure of the parent molecule N(sub 4)P(sub 4)F(sub 8) by using x-ray diffraction, gas electron diffraction and differential scanning calorimetry is described. The results from each of these measurements support a nonplanar eight-membered ring for N(sub 4)P(sub 4)F(sub 8) that is puckered and that undergoes a phase transition at -74 degrees C.

The synthesis via reaction of [C.sub.[alpha],[C.sub.ortho] dilithiated phosphazene with CuBr and structural characterization of the binuclear mixed valence [[Cu.sup.I]([N.sub.2])/[Cu.sup.III]([C.sub.4])] complex displaying a metal-metal bond, as well as its applications in cyclopropanation and oxidation reactions, are described.

A synthetic strategy is developed to prepare cyclotriphosphazenes that bear polycatenar aromatic esters as promesogenic units linked to phosphorus atoms. The columnar organizations in cyclotriphosphazenes can be explained by a discotic structure consisting of promesogenic cores arranged approximately parallel to the cyclotriphosphazene ring.

The synthesis and structures of unprecedented cyclocarbophosphazene-containing tetramers, where the individual six-membered carbophosphazene inorganic rings are tethered together by P-O-P and P-O-Cu bonds are reported. These structural entities are unprecedented among heterocyclophosphazenes.