... The combined organic layers were washed with saturated NaCl solution, dried (MgSO,), and concentrated to afford 0.21 g of a solid, which was sublimed (95 "C/O.lO mm) to give 0.10 g (64%) of 12: mp 179-180 "C; IR 1575 cm ... (14) Finley, K. T. In The Chemistry of the ... 2876 J. Org ...