Fallowing the each compound structural formula and dipole moments has to be determined. Concept introduction: The 1 H N M R spectrum of a compound provides some vital information that is required to predict the structure of the compound. The chemical shift values can predict the groups that are present in the molecule. The splitting of signals by the ( N + 1 ) rule predicts the number of hydrogens or protons attached to the adjacent carbon in a carbon chain of a compound. With this information, the structure of the compound can be predicted. Tetra methyl silane: The NMR spectrum of any compound is taken with reference to a standard compound called reference compound. Generally, tetramethylsilane (TMS) is taken as the reference compound. The methyl protons of TMS are equivalent and produces only one sharp peak at the rightmost end of the scale. Dipole moment is defined as a measurement of the separation of two opposite electrical charges. Dipole moments are a vector quantity.

Question

(a) Tsomane and Nyiko were given a task of synthesising methylenecyclohexane 2. After a brief discussion with each other, Tsomane proposed Method A to synthesise 2 from cyclohexanone 1 while Nyiko proposed Method B that started from hydroxymethylcyclohexane 3. Each student believed that their proposed method is better than the other. (Scheme below) (1) 1 Ph THF A Ph Ph B H₂SO4 100 °C 3 OH What is the name of the reaction that is followed by reaction Method A?

Answer 1

Question

Chapter 13, Problem 13.14P

(a)

Interpretation Introduction

Interpretation:

Fallowing the each compound structural formula and dipole moments has to be determined.

Concept introduction:

The 1H NMR spectrum of a compound provides some vital information that is required to predict the structure of the compound. The chemical shift values can predict the groups that are present in the molecule. The splitting of signals by the (N+1) rule predicts the number of hydrogens or protons attached to the adjacent carbon in a carbon chain of a compound. With this information, the structure of the compound can be predicted.

Tetra methyl silane: The NMR spectrum of any compound is taken with reference to a standard compound called reference compound. Generally, tetramethylsilane (TMS) is taken as the reference compound. The methyl protons of TMS are equivalent and produces only one sharp peak at the rightmost end of the scale.

Dipole moment is defined as a measurement of the separation of two opposite electrical charges. Dipole moments are a vector quantity.

(b)

Interpretation Introduction

Interpretation:

Fallowing the each compound charge separtion have to be determined.

Concept introduction:

The 1H NMR spectrum of a compound provides some vital information that is required to predict the structure of the compound. The chemical shift values can predict the groups that are present in the molecule. The splitting of signals by the (N+1) rule predicts the number of hydrogens or protons attached to the adjacent carbon in a carbon chain of a compound. With this information, the structure of the compound can be predicted.

Tetra methyl silane: The NMR spectrum of any compound is taken with reference to a standard compound called reference compound. Generally, tetramethylsilane (TMS) is taken as the reference compound. The methyl protons of TMS are equivalent and produces only one sharp peak at the rightmost end of the scale.

Dipole moment is defined as a measurement of the separation of two opposite electrical charges. Dipole moments are a vector quantity.

(c)

Interpretation Introduction

Interpretation:

Fallowing the each compounds structural formula and 1 H NMR chmical shifts has to be determined.

Concept introduction:

The 1H NMR spectrum of a compound provides some vital information that is required to predict the structure of the compound. The chemical shift values can predict the groups that are present in the molecule. The splitting of signals by the (N+1) rule predicts the number of hydrogens or protons attached to the adjacent carbon in a carbon chain of a compound. With this information, the structure of the compound can be predicted.

Tetra methyl silane: The NMR spectrum of any compound is taken with reference to a standard compound called reference compound. Generally, tetramethylsilane (TMS) is taken as the reference compound. The methyl protons of TMS are equivalent and produces only one sharp peak at the rightmost end of the scale.

Dipole moment is defined as a measurement of the separation of two opposite electrical charges. Dipole moments are a vector quantity.

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