Textbook Question
Given the following names, draw the structure of the molecule.
c. (S)-2-methyloctan-4-amine
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5. Chirality
R and S Configuration
Problem 59e
Textbook Question
Using IUPAC rules, name the following molecules.
(e) 
Verified step by step guidance1
Step 1: Identify the parent chain. The parent chain is the longest continuous chain of carbon atoms. In this molecule, the parent chain is the two-carbon chain attached to the cyclopropene ring.
Step 2: Determine the substituents. The molecule contains a cyclopropene ring (a three-membered ring with one double bond) and an ethyl group attached to the parent chain.
Step 3: Assign the locants for substituents. Number the parent chain starting from the end closest to the cyclopropene ring to give the substituents the lowest possible numbers.
Step 4: Combine the substituents and parent chain name. Use the IUPAC rules to name the molecule, ensuring the substituents are listed alphabetically and their positions are indicated by numbers.
Step 5: Verify the stereochemistry. The wedge bond indicates that the ethyl group is coming out of the plane of the paper. Include stereochemical descriptors (e.g., R/S or cis/trans) if necessary.
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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 for naming organic chemical compounds. It provides a set of rules to ensure that each compound has a unique and descriptive name based on its structure. Key elements include identifying the longest carbon chain, naming substituents, and determining the correct numbering of the carbon atoms to give substituents the lowest possible numbers.
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The different parts of an IUPAC name
Functional Groups
Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. Recognizing functional groups is essential for naming compounds, as they often dictate the suffix or prefix used in the IUPAC name. Common functional groups include alcohols, carboxylic acids, and amines, each with distinct naming conventions.
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Stereochemistry
Stereochemistry refers to the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In naming compounds, it is important to identify any stereoisomers, such as cis/trans or R/S configurations, as these can significantly influence the properties and reactivity of the compounds. Properly indicating stereochemistry is crucial for accurate IUPAC naming.
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