The NMR coupling constants provide information about the different parts of a compound, leading to the assignment of signals, determination of formula[1], conformation, stereochemistry and the nature of chemical bonds[2]. Here, the synthesis of a new phosphoric triamide, (CHCl2C(O)NH)((CH3)2CHCH2NH)2P(O), is reported (Scheme 1). In the 13C{1H} NMR spectrum, the doublets at 67.32 ppm (J = 11.0 Hz) and 29.89 ppm (J = 5.6 Hz) correspond to the carbon atoms with three-bond separation from phosphorus in amide and amine moieties, respectively. In the 1H NMR spectrum, a singlet at 9.48 ppm and a doublet of triplet at 4.51 ppm (J = 11.3 and 7.0 Hz) correspond to the NH units of the amide and amine segments, respectively. The two methyl groups of isobutyl segment appear two doublets at 0.84 ppm (3JHH = 6.6 Hz) and 0.83 ppm (3JHH = 6.9 Hz). Phosphorus signal in the 31P{1H} NMR spectrum is revealed as a singlet at 7.60 ppm.

Keywords