“…Starting with 12a (1.02 g, 5.8 mmol) and 1a (3.00 g, 11.5 mmol), dissolved in CH 2 Cl 2 (10 mL), 13a was isolated as a yellow solid (0.90 g, 61%), mp 62-64 • C. (KBr, cm −1 ): m = 3439 (w), 3103 (s), 3068 (s), 2959 (s), 2911 (s), 2854 (s), 1747 (m), 1724 (m), 1587 (s), 1481 (s), 1446 (m), 1439 (s), 1409 (s), 1373 (s), 1339 (m), 1323 (m), 1264 (s), 1205 (m), 1154 (m), 1127 (s), 1090 (s), 1072 (s), 1057 (s), 1024 (s), 948 (s), 869 (s), 796 (s), 748 (s), 720 (s), 688 (s), 652 (s), 607 (s), 541 (s), 528 (s), 461 (s). MS (EI, 70 eV): m/z (%) = 256 (M + , 2), 225 (19), 224 (11), 192 (31), 183 (25), 174 (9), 160 (18), 141 (87), 135 (17), 125 (17), 118 (13), 115 (39), 101 (45), 94 (12), 91 (19), 78 (20), 77 (100), 74 (14), 69 (16), 59 (13), 51 (37), 43 (14)…”