AN UNUSUAL WAY OF FORMATION OF SPIROPHOSPHORANES DURING THE OXIDATIVEADDITION OF HEXAFLUOROACETONE TO SIGMA-P-5-SIGMA-P-3 DIPHOSPHORUS COMPOUNDS, AND IN THE REACTION OF HENYLSELENO-1,3,2-SIGMA(5)-DIAZAPHOSPHETIDIN-4-ONE WITH BIS(2-CHLOROETHYLAMINE)HYDROCHLORIDE TRIETHYLAMINE (VOL 623, PG 1325, 1997)/