... respectively) spectrometer at 298 K with residual solvent peaks as internal reference and the chemical shifts are ... for C 10 H 8 79 BrNNaO 2 ([M + Na] + ), 275.9631; found, 275.9629. ... Na 2 S 2 O 3 . The mixture was extracted with EtOAc (2x) and the combined organic layers were ...