The following NMR spectra correspond to compounds of formulas (A) C9H10O2 (B) C4H6O2 and (C) C6H10O2 respectively. Propose structures, and show how they are consistent with the observed absorptions.
From this given NMR spectrum we have to predict the structure of the following molecules:-
(A) C9H10O2 (B) C4H6O2 and (C) C6H10O2
Spectrum A: (C9H12O2)
In H1NMR spectrum, the protons on the C-atom absorb at 3.82 (due to bonding with carbonyl group).
The proton on the -carbon atom absorb at 1.50 because this C-atm is bonded to methyne carbon.
The H-atoms present on the carboxylic acid are most deshielded protons, absorbing at 11.8.
The H-atoms present on the benzene ring absorbs between 7.0 and 9.0.
Hence from this data, the required compound is said to be as 2-phenyl propanoic acid.
Textbook: Organic Chemistry
Author: L.G. Wade Jr
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