For the given compounds the chemical shift values of the signals to be predicted. Concept Introduction : Chemical shift : The frequency of the proton signal in the spectrum with reference to the standard compound which may be TMS(Tetramethylsilane) shows signal at 0 ppm(parts per million). Chemical shift = signal frequency- reference frequency frequency of spectrometer ( 10 6 ) Bench mark values : The chemical shift values to remember for the protons below. Methyl 0 .9 (chemical shift) Methylene 1 .2 (chemical shift) Methine 1 .7 (chemical shift) Inductive effect : The presence of functional groups at the alpha position has impact on the protons FUNCTIONAL GROUP EFFECT ON THE ALPHA PROTONS EFFECT ON THE BETA PROTONS Oxygen of an alcohol or ether +2 .5 +0 .5 Oxygen of ester +3 .0 +0 .6 Carbonyl groups +1 .0 +0 .2 Chemical shift values for protons in different electronic environment: Types of protons Chemical shift Allylic ~2 Alkynyl ~2 .5 Aromatic methyl ~2 .5 Alkyl halide ~2-4 Alcohol ~ 2 − 5 Vinyl ~ 4.5 − 6.5 Aryl ~ 6.5 − 8 Aldehyde ~ 10 carboxylic ~ 12

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Answer 1

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Chapter 15, Problem 47PP

Interpretation Introduction

Interpretation: For the given compounds the chemical shift values of the signals to be predicted.

Concept Introduction:

Chemical shift: The frequency of the proton signal in the spectrum with reference to the standard compound which may be TMS(Tetramethylsilane) shows signal at 0 ppm(parts per million).

Chemical shift = signal frequency- reference frequencyfrequency of spectrometer(106)

Bench mark values: The chemical shift values to remember for the protons below.

Methyl 0.9 (chemical shift)
Methylene 1.2 (chemical shift)
Methine 1.7 (chemical shift)

Inductive effect: The presence of functional groups at the alpha position has impact on the protons

FUNCTIONAL GROUP EFFECT ON THE ALPHA PROTONS EFFECT ON THE BETA PROTONS
Oxygen of an alcohol or ether +2.5 +0.5
Oxygen of ester +3.0 +0.6
Carbonyl groups +1.0 +0.2

Chemical shift values for protons in different electronic environment:

Types of protons Chemical shift
Allylic ~2
Alkynyl ~2.5
Aromatic methyl ~2.5
Alkyl halide ~2-4
Alcohol ~2−5
Vinyl ~4.5−6.5
Aryl ~6.5−8
Aldehyde ~10
carboxylic ~12

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Answer 2

Question

Chapter 15, Problem 47PP

Interpretation Introduction

Interpretation: For the given compounds the chemical shift values of the signals to be predicted.

Concept Introduction:

Chemical shift: The frequency of the proton signal in the spectrum with reference to the standard compound which may be TMS(Tetramethylsilane) shows signal at 0 ppm(parts per million).

Chemical shift = signal frequency- reference frequencyfrequency of spectrometer(106)

Bench mark values: The chemical shift values to remember for the protons below.

Methyl 0.9 (chemical shift)
Methylene 1.2 (chemical shift)
Methine 1.7 (chemical shift)

Inductive effect: The presence of functional groups at the alpha position has impact on the protons

FUNCTIONAL GROUP EFFECT ON THE ALPHA PROTONS EFFECT ON THE BETA PROTONS
Oxygen of an alcohol or ether +2.5 +0.5
Oxygen of ester +3.0 +0.6
Carbonyl groups +1.0 +0.2

Chemical shift values for protons in different electronic environment:

Types of protons Chemical shift
Allylic ~2
Alkynyl ~2.5
Aromatic methyl ~2.5
Alkyl halide ~2-4
Alcohol ~2−5
Vinyl ~4.5−6.5
Aryl ~6.5−8
Aldehyde ~10
carboxylic ~12

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Answer 3

Question

Chapter 15, Problem 47PP

Interpretation Introduction

Interpretation: For the given compounds the chemical shift values of the signals to be predicted.

Concept Introduction:

Chemical shift: The frequency of the proton signal in the spectrum with reference to the standard compound which may be TMS(Tetramethylsilane) shows signal at 0 ppm(parts per million).

Chemical shift = signal frequency- reference frequencyfrequency of spectrometer(106)

Bench mark values: The chemical shift values to remember for the protons below.

Methyl 0.9 (chemical shift)
Methylene 1.2 (chemical shift)
Methine 1.7 (chemical shift)

Inductive effect: The presence of functional groups at the alpha position has impact on the protons

FUNCTIONAL GROUP EFFECT ON THE ALPHA PROTONS EFFECT ON THE BETA PROTONS
Oxygen of an alcohol or ether +2.5 +0.5
Oxygen of ester +3.0 +0.6
Carbonyl groups +1.0 +0.2

Chemical shift values for protons in different electronic environment:

Types of protons Chemical shift
Allylic ~2
Alkynyl ~2.5
Aromatic methyl ~2.5
Alkyl halide ~2-4
Alcohol ~2−5
Vinyl ~4.5−6.5
Aryl ~6.5−8
Aldehyde ~10
carboxylic ~12

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Answer 4

Question

Chapter 15, Problem 47PP

Interpretation Introduction

Interpretation: For the given compounds the chemical shift values of the signals to be predicted.

Concept Introduction:

Chemical shift: The frequency of the proton signal in the spectrum with reference to the standard compound which may be TMS(Tetramethylsilane) shows signal at 0 ppm(parts per million).

Chemical shift = signal frequency- reference frequencyfrequency of spectrometer(106)

Bench mark values: The chemical shift values to remember for the protons below.

Methyl 0.9 (chemical shift)
Methylene 1.2 (chemical shift)
Methine 1.7 (chemical shift)

Inductive effect: The presence of functional groups at the alpha position has impact on the protons

FUNCTIONAL GROUP EFFECT ON THE ALPHA PROTONS EFFECT ON THE BETA PROTONS
Oxygen of an alcohol or ether +2.5 +0.5
Oxygen of ester +3.0 +0.6
Carbonyl groups +1.0 +0.2

Chemical shift values for protons in different electronic environment:

Types of protons Chemical shift
Allylic ~2
Alkynyl ~2.5
Aromatic methyl ~2.5
Alkyl halide ~2-4
Alcohol ~2−5
Vinyl ~4.5−6.5
Aryl ~6.5−8
Aldehyde ~10
carboxylic ~12

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Answer 5

Chapter 15, Problem 47PP

Interpretation Introduction

Interpretation: For the given compounds the chemical shift values of the signals to be predicted.

Concept Introduction:

Chemical shift: The frequency of the proton signal in the spectrum with reference to the standard compound which may be TMS(Tetramethylsilane) shows signal at 0 ppm(parts per million).

Chemical shift = signal frequency- reference frequencyfrequency of spectrometer(106)

Bench mark values: The chemical shift values to remember for the protons below.

Methyl 0.9 (chemical shift)
Methylene 1.2 (chemical shift)
Methine 1.7 (chemical shift)

Inductive effect: The presence of functional groups at the alpha position has impact on the protons

FUNCTIONAL GROUP EFFECT ON THE ALPHA PROTONS EFFECT ON THE BETA PROTONS
Oxygen of an alcohol or ether +2.5 +0.5
Oxygen of ester +3.0 +0.6
Carbonyl groups +1.0 +0.2

Chemical shift values for protons in different electronic environment:

Types of protons Chemical shift
Allylic ~2
Alkynyl ~2.5
Aromatic methyl ~2.5
Alkyl halide ~2-4
Alcohol ~2−5
Vinyl ~4.5−6.5
Aryl ~6.5−8
Aldehyde ~10
carboxylic ~12

Answer 6

Chapter 15, Problem 47PP

Interpretation Introduction

Interpretation: For the given compounds the chemical shift values of the signals to be predicted.

Concept Introduction:

Chemical shift: The frequency of the proton signal in the spectrum with reference to the standard compound which may be TMS(Tetramethylsilane) shows signal at 0 ppm(parts per million).

Chemical shift = signal frequency- reference frequencyfrequency of spectrometer(106)

Bench mark values: The chemical shift values to remember for the protons below.

Methyl 0.9 (chemical shift)
Methylene 1.2 (chemical shift)
Methine 1.7 (chemical shift)

Inductive effect: The presence of functional groups at the alpha position has impact on the protons

FUNCTIONAL GROUP EFFECT ON THE ALPHA PROTONS EFFECT ON THE BETA PROTONS
Oxygen of an alcohol or ether +2.5 +0.5
Oxygen of ester +3.0 +0.6
Carbonyl groups +1.0 +0.2

Chemical shift values for protons in different electronic environment:

Types of protons Chemical shift
Allylic ~2
Alkynyl ~2.5
Aromatic methyl ~2.5
Alkyl halide ~2-4
Alcohol ~2−5
Vinyl ~4.5−6.5
Aryl ~6.5−8
Aldehyde ~10
carboxylic ~12

Answer 7

Chapter 15, Problem 47PP

Interpretation Introduction

Interpretation: For the given compounds the chemical shift values of the signals to be predicted.

Concept Introduction:

Chemical shift: The frequency of the proton signal in the spectrum with reference to the standard compound which may be TMS(Tetramethylsilane) shows signal at 0 ppm(parts per million).

Chemical shift = signal frequency- reference frequencyfrequency of spectrometer(106)

Bench mark values: The chemical shift values to remember for the protons below.

Methyl 0.9 (chemical shift)
Methylene 1.2 (chemical shift)
Methine 1.7 (chemical shift)

Inductive effect: The presence of functional groups at the alpha position has impact on the protons

FUNCTIONAL GROUP EFFECT ON THE ALPHA PROTONS EFFECT ON THE BETA PROTONS
Oxygen of an alcohol or ether +2.5 +0.5
Oxygen of ester +3.0 +0.6
Carbonyl groups +1.0 +0.2

Chemical shift values for protons in different electronic environment:

Types of protons Chemical shift
Allylic ~2
Alkynyl ~2.5
Aromatic methyl ~2.5
Alkyl halide ~2-4
Alcohol ~2−5
Vinyl ~4.5−6.5
Aryl ~6.5−8
Aldehyde ~10
carboxylic ~12

Answer 8

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Answer 10

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Answer 11

Ch. 15.4 - Prob. 1LTS Ch. 15.4 - Prob. 1PTS Ch. 15.4 - Prob. 2PTS Ch. 15.4 - Prob. 3PTS Ch. 15.4 - Prob. 4ATS Ch. 15.4 - Prob. 2LTS Ch. 15.4 - Prob. 5PTS Ch. 15.4 - Prob. 6PTS Ch. 15.4 - Carvone, a natural product isolated from plants,...Ch. 15.5 - Prob. 3LTS

Methyl	0.9 (chemical shift)
Methylene	1.2 (chemical shift)
Methine	1.7 (chemical shift)

FUNCTIONAL GROUP	EFFECT ON THE ALPHA PROTONS	EFFECT ON THE BETA PROTONS
Oxygen of an alcohol or ether	+2.5	+0.5
Oxygen of ester	+3.0	+0.6
Carbonyl groups	+1.0	+0.2

Types of protons	Chemical shift
Allylic	~2
Alkynyl	~2.5
Aromatic methyl	~2.5
Alkyl halide	~2-4
Alcohol	~2−5
Vinyl	~4.5−6.5
Aryl	~6.5−8
Aldehyde	~10
carboxylic	~12

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