... 7 10000 6066 0 8.0 7.5 70 65 6.0 55 ( ppm ) // H - 3a 0 7749 H - 6 , -6 20633 30 2.5 3. 0551 H - 8 Figure 2. H NMR spectrum ( 300.13 MHz ) of the crude mixture of 7 - d2 . 8 - d2 , and 9 - d2 measured in CDC13 at room temperature . 1 ...