b) 6) Consider the two carbonyl compounds below. The signal that corresponds to the hydrogens directly next to the carbonyl (called the a hydrogens) have been boxed on both spectra. In structure a, the boxed a hydrogen signal occurs at 2.4 ppm. In structure b, the boxed a hydrogen signal occurs at 3.61 ppm. Please explain the observed downfield shift between the two compounds. 2.10 2.25 O= 1.60 2.40 3.61 0.93 2.25 PPM PPM

b) 6) Consider the two carbonyl compounds below. The signal that corresponds to the hydrogens directly next to the carbonyl (called the a hydrogens) have been boxed on both spectra. In structure a, the boxed a hydrogen signal occurs at 2.4 ppm. In structure b, the boxed a hydrogen signal occurs at 3.61 ppm. Please explain the observed downfield shift between the two compounds. 2.10 2.25 O= 1.60 2.40 3.61 0.93 2.25 PPM PPM

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter13: Structure Determination: Nuclear Magnetic Resonance Spectroscopy

Section13.12: Dept 13c Nmr Spectroscopy

Problem 21P

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