... The Journal of Organic ... This organic/aqueous solution was concentrated under reduced pressure to remove the ether phase. ... 1 H NMR (300 MHz, CDCl 3 ) δ: 1.28 (9H, s), 2.47 and 2.68 (1H + 1H, AB part of ABX system, J AX = 6 Hz, J BX = 7 Hz J AB = 13 Hz), 3.05 (1H, br m ...