“…Spectroscopic data were consistent with the literature. 34 R f = 0.18 (petroleum ether/ethyl acetate, 7:3); 1 H NMR (500 MHz, CDCl 3 ) δ 7.31 (d, J = 8.1 Hz, 2H), 7.21 (d, J = 7.8 Hz, 2H), 3.69 (s, 8H), 2.38 (s, 3H); 13 C{ 1 H} NMR (126 MHz, CDCl 3 ) δ 170.8, 140.2, 132.5, 129.3 (2 × CH), 127.4 (2 × CH), 67.1, 59.7, 38.3, 31.4, 29.8; LCMS (ESI) m / z : [M + H] + Calcd for C 12 H 16 NO 2 206.1; Found 206.2 at 6.48 min.…”