Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure

Bruice8th EditionOrganic ChemistryISBN: 9780135213711Not the one you use?Change textbook

Bruice 8th Edition

Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure

Problem 55i

Chapter 4, Problem 55i

Draw a condensed structure and a skeletal structure for each of the following:
i. 3-ethoxy-2-methylhexane

Verified step by step guidance

Step 1: Identify the parent chain. The parent chain is 'hexane,' which means the molecule has six carbon atoms in the main chain. Number the chain from the end closest to the substituents to minimize the locants.

Step 2: Locate the substituents. The name '3-ethoxy-2-methylhexane' indicates two substituents: an ethoxy group (-OCH₂CH₃) attached to carbon 3 and a methyl group (-CH₃) attached to carbon 2.

Step 3: Draw the condensed structure. Start with the parent chain (CH₃-CH₂-CH₂-CH₂-CH₂-CH₃) and add the substituents at the appropriate positions. For example, the ethoxy group (-OCH₂CH₃) is attached to carbon 3, and the methyl group (-CH₃) is attached to carbon 2.

Step 4: Draw the skeletal structure. Represent the hexane chain as a zigzag line, omitting hydrogen atoms for simplicity. Add the ethoxy group (-OCH₂CH₃) as a branch at carbon 3 and the methyl group (-CH₃) as a branch at carbon 2.

Step 5: Double-check the structure. Ensure that all substituents are correctly placed, the parent chain is intact, and the molecule adheres to the IUPAC naming conventions.

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Key Concepts

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

Condensed Structural Formula

A condensed structural formula is a way of representing a chemical compound that shows the arrangement of atoms and the connectivity between them without depicting all the bonds explicitly. In this format, groups of atoms are often grouped together, such as 'C2H5' for ethyl, making it easier to visualize the structure in a compact form.

Skeletal Structure

A skeletal structure, also known as a line-angle structure, is a simplified representation of a molecule where carbon atoms are represented by vertices and hydrogen atoms are implied. This method emphasizes the connectivity of the carbon backbone and functional groups, making it easier to visualize larger organic molecules without cluttering the diagram with hydrogen atoms.

IUPAC Nomenclature

IUPAC nomenclature is a systematic method for naming organic chemical compounds based on their structure. It provides rules for identifying the longest carbon chain, substituents, and functional groups, which is essential for accurately drawing the condensed and skeletal structures of compounds like 3-ethoxy-2-methylhexane, ensuring clarity and consistency in communication among chemists.

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