Question

Which letters correspond to which Hs?

6. 'H-NMR OTBS SH 1 H NMR (400 MHz, CDC13) A= 9.39 (s, 1H), B= 6.66 (dd, J = 9.9, 1.3 Hz, 1H), 6.66 (dd, J = 9.9, 1.3 Hz, 1H), C= 3.45 (dd, J = 5.1, 3.2 Hz, 1H), D=2.94 -2.84 (m, 1H) E= 1.75 (d, J = 1.3 Hz, 3H), 1.73 - 1.67 (m, 1H), 1.04 (d, J = 7.0 Hz, 3H), F= 0.92 (s, 9H), 0.88 (d, J = 6.9 Hz, 3H), 0.83 (d, J = 6.9 Hz, 3H), 0.07 (s, 3H), 0.05 (s, 3H);

Answer 1

Aldehyde hydrogen gives signal at downfield, 9.39 ppm

o-TBS THE