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Ch.3 - Structure and Stereochemistry of Alkanes
Wade - Organic Chemistry 9th Edition
Wade9th EditionOrganic ChemistryISBN: 9780135213728Not the one you use?Change textbook
All textbooksWade 9th EditionCh.3 - Structure and Stereochemistry of AlkanesProblem 39a,b
Chapter 3, Problem 39a,b

Give the IUPAC names of the following alkanes.
(a) CH3C(CH3)2CH(CH2CH3)CH2CH2CH(CH3)2
(b)

Verified step by step guidance
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Step 1: Identify the longest continuous carbon chain in the molecule. This will determine the base name of the alkane. Count the number of carbon atoms in this chain.
Step 2: Number the carbon atoms in the longest chain starting from the end nearest to the first branch point. This ensures the lowest possible numbers for substituents.
Step 3: Identify and name the substituents (branches) attached to the main chain. These are typically alkyl groups such as methyl (CH₃) or ethyl (C₂H₅).
Step 4: Assign a number to each substituent based on the carbon atom it is attached to in the main chain. Use these numbers to indicate the position of each substituent.
Step 5: Combine the names of the substituents with the base name of the alkane, using the numbers to indicate their positions. Arrange substituents alphabetically and use prefixes like di-, tri- if there are multiple identical substituents.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

IUPAC Nomenclature

IUPAC nomenclature is a systematic method of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry. It involves identifying the longest carbon chain, numbering the chain to give substituents the lowest possible numbers, and naming substituents as prefixes. This ensures consistency and clarity in chemical communication.
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The different parts of an IUPAC name

Alkane Structure

Alkanes are saturated hydrocarbons consisting entirely of single-bonded carbon and hydrogen atoms, with the general formula CnH2n+2. Understanding the structure of alkanes is crucial for naming them, as it involves recognizing the main carbon chain and any branching substituents. Alkanes are named based on the number of carbon atoms in the longest chain.
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Substituent Identification

Substituents are groups of atoms attached to the main carbon chain in an organic molecule. Identifying and naming substituents correctly is essential for IUPAC nomenclature. Common substituents include alkyl groups like methyl (CH3-) and ethyl (C2H5-), which are named and numbered based on their position on the main chain to ensure accurate chemical identification.
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Related Practice
Textbook Question

Construct a graph, similar to Figure 3-11, of the torsional energy of 3-methylpentane along the C2―C3 bond.

a. Place C2 in front, represented by three bonds coming together in a Y shape, and C3 in back, represented by a circle with three bonds pointing out from it.

b. Define the dihedral angle as the angle between the methyl group on the front carbon and the ethyl group on the back carbon.

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Textbook Question

Construct a graph, similar to Figure 3-11, of the torsional energy of 3-methylpentane along the C2―C3 bond.

e. Indicate which conformations are the most stable (lowest energy) and the least stable (highest energy).

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Textbook Question

Construct a graph, similar to Figure 3-11, of the torsional energy of 3-methylpentane along the C2―C3 bond.

c. Begin your graph at the 0° dihedral angle and begin to turn the front carbon.

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Textbook Question

Each of the following descriptions applies to more than one alkane. In each case, draw and name two structures that match the description.

c. a cis-diethylcyclohexane

d. a trans-dihalocyclopentane

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Textbook Question

Each of the following descriptions applies to more than one alkane. In each case, draw and name two structures that match the description.

e. a (2,3-dimethylpentyl)cycloalkane

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Textbook Question

Each of the following descriptions applies to more than one alkane. In each case, draw and name two structures that match the description.

f. a bicyclononane

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