The identical, enantiomer and diastereomer for the given compound has to be identified from the given structures. Concept introduction: Stereoisomers are isomers which have different spatial arrangement in spite of same bond connectivity. Stereoisomers are due to the presence of stereocenter. The interchanging the solid-hatched wedge line of two groups of asymmetric centers will give different configuration. Diastereomers are stereoisomers which are neither mirror images nor identical. If two stereoisomers are not enantiomers, then they are Diastereomers. The pair of Enantiomers non-superimposable mirror images of each other.

Question

It is not unexpected that the methoxyl substituent on a cyclohexane ring prefers to adopt the equatorial conformation. OMe H A G₂ = +0.6 kcal/mol OMe What is unexpected is that the closely related 2-methoxytetrahydropyran prefers the axial conformation: H H OMe OMe A Gp=-0.6 kcal/mol Methoxy: CH3O group Please be specific and clearly write the reason why this is observed. This effect that provides stabilization of the axial OCH 3 group in this molecule is called the anomeric effect. [Recall in the way of example, the staggered conformer of ethane is more stable than eclipsed owing to bonding MO interacting with anti-bonding MO...]

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Question

Chapter 4, Problem 97P

Interpretation Introduction

Interpretation:

The identical, enantiomer and diastereomer for the given compound has to be identified from the given structures.

Concept introduction:

Stereoisomers are isomers which have different spatial arrangement in spite of same bond connectivity. Stereoisomers are due to the presence of stereocenter.

The interchanging the solid-hatched wedge line of two groups of asymmetric centers will give different configuration.

Diastereomers are stereoisomers which are neither mirror images nor identical. If two stereoisomers are not enantiomers, then they are Diastereomers.

The pair of Enantiomers non-superimposable mirror images of each other.

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