Bis(diphenylphosphanyl)amine and its disulfide and diselenide. Applicationof the INEPT-HEED pulse sequence for measurement of (1)J(P-31,N-15) and isotope induced chemical shifts 1 Delta N-14/15(P-31) at natural abundance ofN-15

Bis(diphenylphosphanyl)amine (1), the disulfide 1S and diselenide 1Se were selected to show the efficient application of the INEPT-HEED purse sequence for measuring coupling constants (1)J((PN)-P-31-N-15) and isotope induced chemical shifts (1)Delta(14/15)N(P-31), both at natural abundance of N-15, from P-31 NMR spectra. The sign of (1)J(P-31,15N) (> 0) in all three compou nds was determined by selective heteronuclear H-1{P-31} double resonance ex periments.