Organic Chemistry (6th Edition)
Organic Chemistry (6th Edition)
6th Edition
ISBN: 9781260119107
Author: Janice Gorzynski Smith
Publisher: McGraw Hill Education
Question
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Chapter 12C, Problem 40P
Interpretation Introduction

(a)

Interpretation: The downfield shift in Hz from TMS for 300 MHz NMR instrument is to be calculated.

Concept introduction: In NMR spectrum, peaks are known as resonances, lines or absorptions. On the horizontal axis, the position of absorption is generally referred to as chemical shift. The chemical shift of any absorption is calculated by the formula,

Chemical shift=Observed chemical shift(in Hz)downfield from TMSυ of the NMR spectrometer(in MHz)

Interpretation Introduction

(b)

Interpretation: The chemical shift for a signal that comes at 1200 Hz downfield from TMS is to be calculated.

Concept introduction: In NMR spectrum, peaks are known as resonances, lines or absorptions. On the horizontal axis, the position of absorption is generally referred to as chemical shift. The chemical shift of any absorption is calculated by the formula,

Chemical shift=Observed chemical shift(in Hz)downfield from TMSυ of the NMR spectrometer(in MHz)

Interpretation Introduction

(c)

Interpretation: The downfield shift in Hz when two signals are separated by 2 ppm is to be calculated.

Concept introduction: In NMR spectrum, peaks are known as resonances, lines or absorptions. On the horizontal axis, the position of absorption is generally referred to as chemical shift. The chemical shift of any absorption is calculated by the formula,

Chemical shift=Observed chemical shift(in Hz)downfield from TMSυ of the NMR spectrometer(in MHz)

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Using a 300 MHz NMR instrument: a.How many Hz downfield from TMS is a signal at 2.5 ppm? b. If a signal comes at 1200 Hz downfield from TMS, at what ppm does it occur? c.If two signals are separated by 2 ppm, how many Hz does this correspond to?
Using a 300 MHz NMR instrument:a. How many Hz downfield from TMS is a signal at 2.5 ppm?b. If a signal comes at 1200 Hz downeld from TMS, at what ppm does it occur?c. If two signals are separated by 2 ppm, how many Hz does this correspond to?

Chapter 12C Solutions

Organic Chemistry (6th Edition)

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