REACTIONS OF DIMETHYLAMINO)-1-LAMBDA(5),3-LAMBDA(5)-DIPHOSPHETE WITH DIPHENYLCHLOROPHOSPHANE AND METHYL-IODIDE

1,1,3,3-Tetrakis(dimethylamino)-1 lambda(5),3 lambda(5)-diphosphete, I , reacts with diphenylchlorophosphane to yield 1,1,3,3-tetrakis (dimet hylamino)-4-diphenylphosphanyl-1, 2-dihydro-3 lambda(5)-[1,3]diphosphe tium chloride, 2, or, depending on the reaction conditions, the isomer compound 3. The cation of 2 is deprotonated by LiN[Si(CH3)(3)](2) to give the diphenylphosphanyl-substituted derivative of 1, i.e., compoun d 4. Methyl iodide adds to I to form 1,1,3,3-tetrakis (dimethylamino)- 4-methyl-1, 2-dihydro-3 lambda(5)-[1,3]diphosphetium iodide, 6. Deprot onation of 6 with n-butyllithium leads to the monomethyl derivative of 1, i.e., compound 7. Physical properties, NMR spectra, and mass spect ra of compounds 2-4, 6, and 7 are described. The results of the X-ray structural analysis of 6 are reported and discussed. (C) 1996 John Wil ey & Sons, Inc.