Among the five protons shown below select the most shielded (lowest chemical shift). Hint: take into account the effects of an electronegative atom and likely resonance structures. (1) (2) (3) (4) H (1) H مع صوم في HH H (2) (3) (4) (5)

Among the five protons shown below select the most shielded (lowest chemical shift). Hint: take into account the effects of an electronegative atom and likely resonance structures. (1) (2) (3) (4) H (1) H مع صوم في HH H (2) (3) (4) (5)

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

ChapterL4: Proton (1h) Nmr Spectroscopy

Section: Chapter Questions

Problem 20CTQ

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Concept explainers

Analyzing and Predicting Spectroscopic Data

The interaction of electromagnetic radiation with the structure of molecules in the sample and their study is referred spectroscopy. Several spectroscopic methods are used to acquire sample information, and these methods are proved to be accurate, fast, and non-destructive. The information obtained about the content and composition of molecules from these spectroscopic methods is called spectroscopic data.

Question

Among the five protons shown below select the most shielded (lowest chemical shift).
Hint: take into account the effects of an electronegative atom and likely resonance
structures.
H
H
HH
(1)
(2)
(3)
(4)
(5)
(1)
(2)
(3)
(4)
(5)

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