The name and structures of seven isomeric alkynes with molecular formula C 6 H 10 are to be given. Concept introduction: The longest carbon chain which contains the carbon-carbon triple bond is chosen. The chain is numbered from the end that gives the lowest number to the carbon in triple bond. Compounds with more than one triple bond are called diynes, triynes and so forth. Compounds containing both double bond and triple bonds are called as enynes. The chain is numbered from the end nearer to the first of the multiple bonds, double or triple. When there is a choice in numbering the double bond is given preference and the lowest number is given to it. To give: The name and structures of seven isomeric alkynes with molecular formula C 6 H 10 .

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...]

Answer 1

Question

Chapter 9.1, Problem 2P

Interpretation Introduction

Interpretation:

The name and structures of seven isomeric alkynes with molecular formula C₆H₁₀ are to be given.

Concept introduction:

The longest carbon chain which contains the carbon-carbon triple bond is chosen. The chain is numbered from the end that gives the lowest number to the carbon in triple bond. Compounds with more than one triple bond are called diynes, triynes and so forth. Compounds containing both double bond and triple bonds are called as enynes. The chain is numbered from the end nearer to the first of the multiple bonds, double or triple. When there is a choice in numbering the double bond is given preference and the lowest number is given to it.

To give:

The name and structures of seven isomeric alkynes with molecular formula C₆H₁₀.

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