“…2-Hydro-2-oxo-4,7-dihydro-1,3,2-benzodioxaphosphepine ( 7 ) (reaction time: 15 min); colorless needles; yield: 178 mg (0.97 mmol; 97%); 1 H NMR (400 MHz, Chloroform-d) δ 7.42–7.32 (m, 4H), 7.32–7.20 (m, 4H), 7.03 (d, J = 702.3 Hz, 1H), 5.40 (dd, J = 18.0, 13.9 Hz, 2H), 5.18 (dd, J = 15.6, 13.9 Hz, 2H) ppm; 13 C NMR (101 MHz, Chloroform-d) δ 134.7, 129.1, 128.6, 66.3 (d, J = 6 Hz) ppm; 31 P NMR (162 MHz, Chloroform-d) δ 13.09 (dtt, J = 702.3 Hz, J = 17.7, 15.7 Hz) ppm; HRMS–ESI (Micro-Tof, m / z ): [M + Na] + calcd for C 8 H 9 NaO 3 P, 207.0182; found, 207.0178; analytical data are in agreement with the literature [ 9 ].…”