Ch.3 - Structure and Stereochemistry of Alkanes

Wade9th EditionOrganic ChemistryISBN: 9780135213728Not the one you use?Change textbook

Wade 9th Edition

Ch.3 - Structure and Stereochemistry of Alkanes

Problem 8b

Chapter 3, Problem 8b

Draw the structures of the following compounds.
b. 5-(1,2,2-trimethylpropyl)nonane

Verified step by step guidance

Identify the parent chain: The parent chain is 'nonane', which means it is a straight chain alkane with 9 carbon atoms.

Locate the substituent: The substituent is '5-(1,2,2-trimethylpropyl)', which means it is attached to the 5th carbon of the nonane chain.

Understand the substituent structure: '1,2,2-trimethylpropyl' indicates a propyl group (3 carbon atoms) with three methyl groups attached. The numbering suggests that two methyl groups are attached to the second carbon and one methyl group is attached to the first carbon of the propyl group.

Draw the substituent: Start with a propyl group and add the methyl groups according to the given positions. The structure will have a central carbon with two methyl groups and another carbon with one methyl group.

Combine the structures: Attach the '1,2,2-trimethylpropyl' group to the 5th carbon of the nonane chain, ensuring that the overall structure maintains the correct connectivity and branching.

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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 ensures that each compound has a unique name, which describes its structure. Understanding the rules of IUPAC nomenclature is essential for interpreting and constructing chemical names and structures.

Alkane Structure

Alkanes are saturated hydrocarbons consisting of carbon and hydrogen atoms with single bonds. Their general formula is CnH2n+2. Recognizing the structure of alkanes, including linear and branched forms, is crucial for drawing and understanding compounds like nonane, which is a nine-carbon alkane.

Substituents in Organic Chemistry

Substituents are atoms or groups of atoms that replace hydrogen atoms in a hydrocarbon chain. In organic chemistry, identifying and correctly positioning substituents, such as the 1,2,2-trimethylpropyl group in the given compound, is vital for accurately drawing the molecular structure and understanding its chemical properties.

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Related Practice

Textbook Question

Draw the structures of the following groups, and give their more common names.

a. the (1-methylethyl) group

b. the (2-methylpropyl) group

c. the (1-methylpropyl) group

d. the (1,1-dimethylethyl) group

e. the (3-methylbutyl) group, sometimes called the 'isoamyl' group

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Textbook Question

Draw the structures of the following compounds.

c. 3,3-diethyl-4-(2,2-dimethylpropyl)octane

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Textbook Question

List each set of compounds in order of increasing boiling point.

a. hexane, octane, and decane

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Textbook Question

Without looking at the structures, give molecular formulas for the compounds: (a) 4-(1,1-dimethylethyl)octane and (b) 5-(1,2,2-trimethylpropyl)nonane. Use the names of the groups to determine the number of carbon atoms; then use the (2n + 2) rule.

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Textbook Question

Draw the structures of the following compounds.

a. 4-(1,1-dimethylethyl)octane

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Textbook Question

Give structures and names for

a. the five isomers of C₆H₁₄

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