Question

could somebody label the carbon 13 of 4 hydroxy cinammic acid and explain why each signal is designated to a certain carbon?

BE unkciamie acid from heraldehyde #18 consoln in DMSO-d6 yellow cap, hues lab mm, de OPPM 2002 USER - DATE FTS16314 SWL 5411 CIG

Answer 1

4- hydroxy - Cinnamic aud a on f live will observe 7 signals from 4-hydroxy - cinnamle aid Carbon (@) - 170 ppm because carbonyl carbon is highly deshielded carbon Carbon - (C) - 160 pbm because Carbon G is connected to elechon with creawing Phenyl Ring so deshielded Carbon - (b) - 115 ppm y Resonance may decrease deshielding Carbon - (d ) - 130 ppm Carbon- (e) - 2 128 bbm Beth will come in this Region Region carebon (f) - - Carbon - (g) - 145 ppm because connected to Eleihnwith deamin on group. so high Shift &