Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:The 1H NMR for a dipeptide recorded in D20
is shown below.
(i) Explain what has happened to the H-
atoms attached to the N atoms.
(ii) Explain the spectra. Note the signals for HA
and HA'are subject to a second order effect.
H^H*
40 Hz
0.1 ppm
'N-
DN Ha
L-Ala-Gly
(iii) predict which direction the signal for the H
on the alpha-C will move in the 1H NMR on
going from low to high ph and explain why
this leads to a change in chemical shift.
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