Textbook Question
Provide IUPAC names for the following compounds.
a. (CH3)2CHCH2CH3
b. CH3—C(CH3)2—CH3
c.
4. Alkanes and Cycloalkanes
IUPAC Naming
9:32 minutesProblem 41c,d
Textbook Question
The following names are all incorrect or incomplete, but they represent real structures. Draw each structure and name it correctly.
c. 5-chloro-4-methylhexane
d. 2-dimethylbutane
Verified step by step guidance1
Step 1: Analyze the name '5-chloro-4-methylhexane'. The name suggests a hexane backbone, which means the longest carbon chain should have 6 carbons. The substituents are a chlorine atom at the 5th carbon and a methyl group at the 4th carbon.
Step 2: Draw the structure based on the name '5-chloro-4-methylhexane'. Start by drawing a straight chain of 6 carbon atoms. Then, add a chlorine atom to the 5th carbon and a methyl group to the 4th carbon.
Step 3: Check the numbering of the carbon chain to ensure the substituents are on the lowest possible numbers. If the numbering can be improved, adjust the structure accordingly. The correct name should reflect the lowest numbering for substituents.
Step 4: Analyze the name '2-dimethylbutane'. The name suggests a butane backbone, which means the longest carbon chain should have 4 carbons. The term 'dimethyl' indicates two methyl groups attached to the second carbon.
Step 5: Draw the structure based on the name '2-dimethylbutane'. Start by drawing a straight chain of 4 carbon atoms. Then, add two methyl groups to the second carbon. Verify the numbering and adjust if necessary to ensure the correct IUPAC name reflects the lowest numbering for substituents.
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9mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
IUPAC Nomenclature
IUPAC nomenclature is a standardized system for naming chemical compounds. It involves identifying the longest carbon chain, numbering the chain to give substituents the lowest possible numbers, and naming substituents as prefixes. Correct application of these rules ensures clarity and consistency in chemical communication.
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The different parts of an IUPAC name
Structural Isomers
Structural isomers are compounds with the same molecular formula but different structural arrangements of atoms. Understanding isomerism is crucial for correctly naming compounds, as different structures can lead to different names and properties. Identifying isomers involves analyzing the connectivity of atoms within the molecule.
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Substituent Positioning
Substituent positioning refers to the location of groups attached to the main carbon chain in a molecule. Correctly identifying and numbering these positions is essential for accurate naming. The goal is to assign the lowest possible numbers to substituents, following the IUPAC rules, to ensure the name reflects the true structure.
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