MOLEKÜLSTRUKTUR EINES STABILEN PENTAOXY-SPIROPHOSPHORANS MIT PHOSPOR ALS BRÜCKENKOPFATOM ZWISCHEN EINEM SECHSGLIEDRIGEN UND EINEM FÜNFGLIEDRIGEN RING

Abstract
The crystal and molecular structure of the trigonal-bipyramidal pentaoxy-spirophosphorane 1 reveals the smaller influence on the stereochemistry at phosphorus of the six-membered compared with five-membered rings. The large difference between the two axial P[sbnd]O bonds (161.6 and 171.0 pm) and between the three equatorial P[sbnd]O bonds (range 157.7–163.6 pm) is ascribed to the influence of the CF3-groups on the electronegativity of the oxygen atoms.