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Ch. 7 - Structure and Synthesis of Alkenes; Elimination
Wade - Organic Chemistry 9th Edition
Wade9th EditionOrganic ChemistryISBN: 9780135213728Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoWade 9th EditionCh. 7 - Structure and Synthesis of Alkenes; EliminationProblema 7e
Capitolo 7, Problema 7e

The following names are all incorrect. Draw the structure represented by the incorrect name (or a consistent structure if the name is ambiguous), and give your drawing the correct name.
e. 2,5-dimethylcyclohexene

Guida verificata passo dopo passo
1
Identify the given name: 2,5-dimethylcyclohexene. This suggests a cyclohexene ring with methyl groups at positions 2 and 5.
Draw a cyclohexene ring, which is a six-membered carbon ring with one double bond. The double bond should be between two adjacent carbon atoms.
Number the carbon atoms in the cyclohexene ring starting from one of the carbons in the double bond, ensuring the lowest possible numbers for substituents.
Place methyl groups on the cyclohexene ring at the specified positions (2 and 5) according to the given name.
Check the structure for the correct IUPAC naming: Ensure the double bond has the lowest possible locant and adjust the numbering if necessary. Provide the correct name based on the structure drawn.

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IUPAC Nomenclature

IUPAC nomenclature is a standardized system for naming chemical compounds. It ensures that each compound has a unique name, which reflects its structure. Understanding the rules of IUPAC nomenclature is crucial for identifying errors in chemical names and correcting them, such as ensuring the correct numbering of carbon atoms in a cycloalkene.
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The different parts of an IUPAC name

Cycloalkenes

Cycloalkenes are cyclic hydrocarbons containing one or more double bonds within the ring structure. The presence of a double bond affects the numbering of the carbon atoms, as the double bond should receive the lowest possible numbers. Recognizing the structure of cycloalkenes is essential for correctly naming and drawing them.
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01:11
How to find the root name for cycloalkanes

Substituent Positioning

Substituent positioning involves identifying and numbering the location of groups attached to the main carbon chain or ring. In cycloalkenes, substituents should be numbered to give the lowest possible numbers, considering the position of the double bond. Correctly identifying substituent positions is key to correcting the name of a compound like 2,5-dimethylcyclohexene.
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4:06
Reactions at the Allylic Position Example 3
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Domanda del libro di testo

The following names are all incorrect. Draw the structure represented by the incorrect name (or a consistent structure if the name is ambiguous), and give your drawing the correct name.

a. cis-dimethylpent-2-ene

b. 3-vinylhex-4-ene

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Domanda del libro di testo

For each reaction, decide whether substitution or elimination (or both) is possible, and predict the products you expect. Label the major products.

b. 1-bromo-1-methylcyclohexane + triethylamine(Et3N:)

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Domanda del libro di testo

Some of the following examples can show geometric isomerism, and some cannot. For the ones that can, draw all the geometric isomers, and assign complete names using the E-Z system.

a. 3-bromo-2-chloropent-2-ene

b. 3-ethylhexa-2,4-diene

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Domanda del libro di testo

The following names are all incorrect. Draw the structure represented by the incorrect name (or a consistent structure if the name is ambiguous), and give your drawing the correct name.

c. 2-methylcyclopentene

d. 6-chlorocyclohexadiene

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Domanda del libro di testo

Some of the following examples can show geometric isomerism, and some cannot. For the ones that can, draw all the geometric isomers, and assign complete names using the E-Z system.

c. 3-bromo-2-methylhex-3-ene

d. penta-1,3-diene

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Domanda del libro di testo

Some of the following examples can show geometric isomerism, and some cannot. For the ones that can, draw all the geometric isomers, and assign complete names using the E-Z system.

e. 3-ethyl-5-methyloct-3-ene

f. 3,7-dichloroocta-2,5-diene

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