“…Prepared from diamine 10 (0.15 g, 0.39 mmol), phosphorus trichloride (0.04 mL, 0.43 mmol), triethylamine (0.14 mL, 0.98 mmol) in toluene (10 mL), and water (7.00 μL, 0.39 mmol) and triethylamine (0.06 mL, 0.43 mmol) after filtration. After evaporation, product 19 was obtained as yellow oil (0.16 g, 0.38 mmol, 97% 18.0 (C-9, C-10) ppm. 31 2 -CH 3 ), 18.6 (C-9), 18.5 (C-10) ppm.…”