When ethanol is heated in the presence of an acid catalyst,...

Name: Problem 117, Chapter 22: Chemistry: The Molecular Nature of Matter
Uploaded: 2021-06-10T18:04:15-08:00
Duration: 1 min 58 s
Channel: Nicholas Sacco
Description: When ethanol is heated in the presence of an acid catalyst, ethene and water form; an elimination reaction occurs. When butan-2-ol is heated under similar conditions, two alkenes form (although not in equal quantities). Write the structures and IUPAC names of these two alkenes.

When ethanol is heated in the presence of an acid catalyst, ethene and water form; an elimination reaction occurs. When butan-2-ol is heated under similar conditions, two alkenes form (although not in equal quantities). Write the structures and IUPAC names of these two alkenes.

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Key Concepts

Elimination Reaction

An elimination reaction is a type of organic reaction where two substituents are removed from a molecule, often resulting in the formation of a double bond. This process typically involves the removal of atoms from adjacent carbons, leading to the generation of alkenes or alkynes.

Dehydration Reaction

A dehydration reaction is a specific kind of elimination reaction that occurs when a water molecule is removed from an alcohol. Under the influence of an acid catalyst and heat, the hydroxyl group and a hydrogen atom are eliminated from adjacent carbons, forming a carbon–carbon double bond and resulting in the formation of an alkene.

Regioselectivity

Regioselectivity refers to the preference for the formation of one constitutional isomer over another in a chemical reaction. In elimination reactions such as dehydration, different alkenes can form depending on which hydrogen atom is removed. This is often influenced by factors like the stability of the resulting alkenes, governed by rules such as Zaitsev's rule.

IUPAC Nomenclature

IUPAC nomenclature is the standardized system used to name organic compounds. It involves identifying and naming the longest carbon chain, the position of functional groups or multiple bonds, and any substituents, ensuring that each compound has a unique and systematic name.

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