4. Alkanes and Cycloalkanes

Conformational Isomers

4. Alkanes and Cycloalkanes

Conformational Isomers

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Understanding what a conformer is.

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Multiple Choice

Determine if the following pair of molecules is isomers or conformers?

Determine if the following pair of molecules is isomers or conformers?

Determine if the following pair of molecules is isomers or conformers?

Determine if the following pair of molecules is isomers or conformers?

What is the difference between constitutional and conformational isomers?

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Multiple Choice

Provide the complete IUPAC name for the following molecule.

Draw a perspective representation of the most stable conformation of 3-methylhexane.

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Textbook Question

(LOOKING AHEAD) In Chapter 8, we study the chemistry of alkenes, like ethene. In contrast to ethane, there is no free rotation around the C = C double bond of ethene. Explain this in the context of the molecular orbital picture of ethene. <IMAGE>

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Textbook Question

(•••) In contrast to ethane and other alkanes studied in this chapter, there is no free rotation around any bonds in cyclopentane (shown below). Why?

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Textbook Question

For rotation about the C-3-C-4 bond of 2-methylhexane, do the following: c. About which other carbon–carbon bonds may rotation occur? d. How many of the carbon–carbon bonds in the compound have staggered conformers that are all equally stable?

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Textbook Question

Although there is free rotation around most σ bonds, rotation is restricted around the C--N bond of an amide. Explain why this is true.

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