11 The two 1H-nmr signal between 6.0-7.0 (d * and dt) is due to (2 (2 ) TH NMR Spectrum (200 MHz, CDCI, solution) exchanges with D20 expansion expansion 7.0 6.2 ppm 3.8 3.0 ppm TMS 1 10 9 8 7 6 5 4 3 2 1 0 8 (ppm) OH CH2 aliphatic C-H Aromatic CH3 aliphatic vinylic H