How many ethers have molecular formula C5H12O? Draw their structures and give each a systematic name. What are their common names?

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

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Bruice 8th Edition

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

Problem 78

Chapter 4, Problem 78

How many ethers have molecular formula C₅H₁₂O? Draw their structures and give each a systematic name. What are their common names?

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Step 1: Understand the molecular formula C5H12O. This formula corresponds to ethers, which are organic compounds containing an oxygen atom bonded to two alkyl or aryl groups (R-O-R'). The task is to identify all possible structural isomers of ethers with this formula.

Step 2: Begin by considering the possible carbon chain lengths for the two alkyl groups (R and R') that add up to five carbons. For example, you can have combinations like C1 and C4, C2 and C3, or C2 and C2 (symmetric).

Step 3: For each combination of alkyl groups, draw the possible structures of ethers. Ensure that the total number of carbons in the molecule is five, and the oxygen atom is placed between two carbon groups. For example, one structure could be CH3-O-CH2CH2CH2CH3.

Step 4: Assign systematic (IUPAC) names to each ether structure. The naming convention for ethers involves identifying the two alkyl groups attached to the oxygen atom and listing them alphabetically, followed by the word 'ether.' For example, CH3-O-CH2CH2CH2CH3 would be named '1-methoxybutane.'

Step 5: Determine the common names for each ether. Common names are often derived from the names of the alkyl groups attached to the oxygen atom, followed by the word 'ether.' For example, CH3-O-CH2CH2CH2CH3 would be called 'methyl butyl ether.' Repeat this process for all isomers.

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Key Concepts

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

Ethers

Ethers are a class of organic compounds characterized by an oxygen atom connected to two alkyl or aryl groups. They have the general formula R-O-R', where R and R' represent hydrocarbon chains. Ethers are known for their relatively low reactivity and are commonly used as solvents in organic chemistry. Understanding the structure and naming conventions of ethers is essential for identifying the compounds with the given molecular formula.

Molecular Formula

A molecular formula provides the number and type of atoms in a molecule, represented by the symbols of the elements and subscripts indicating the quantity of each atom. For the formula C5H12O, it indicates that the molecule contains five carbon atoms, twelve hydrogen atoms, and one oxygen atom. This information is crucial for determining the possible structural isomers and functional groups present in the compound.

Systematic Naming (IUPAC Nomenclature)

Systematic naming, or IUPAC nomenclature, is a standardized method for naming chemical compounds based on their structure and functional groups. For ethers, the naming convention typically involves identifying the two alkyl groups attached to the oxygen and using the suffix 'ether.' This systematic approach ensures that each compound has a unique and descriptive name, facilitating clear communication in the scientific community.