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Related Concept Videos

Acid-Catalyzed Dehydration of Alcohols to Alkenes02:35

Acid-Catalyzed Dehydration of Alcohols to Alkenes

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In a dehydration reaction, a hydroxyl group in an alcohol is eliminated along with the hydrogen from an adjacent carbon. Here, the products are an alkene and a molecule of water. Dehydration of alcohols is generally achieved by heating in the presence of an acid catalyst. While the dehydration of primary alcohols requires high temperatures and acid concentrations, secondary and tertiary alcohols can lose a water molecule under relatively mild conditions.
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Oxidation of Alcohols02:37

Oxidation of Alcohols

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In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
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Acid-Catalyzed Ring-Opening of Epoxides02:24

Acid-Catalyzed Ring-Opening of Epoxides

9.0K
Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
9.0K
Base-Catalyzed Ring-Opening of Epoxides02:26

Base-Catalyzed Ring-Opening of Epoxides

10.3K
Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
10.3K
Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis02:29

Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis

13.0K
Overview
Ethers can be prepared from organic compounds by various methods. Some of them are discussed below,
Preparation of Ethers by Alcohol Dehydration
In this method, in the presence of protic acids, alcohol dehydrates to produce alkenes and ethers under different conditions. For example, in the presence of sulphuric acid, dehydration of ethanol at 413 K yields ethoxyethane, whereas it yields ethene at 443 K.
13.0K
Protection of Alcohols02:31

Protection of Alcohols

8.1K
This lesson delves into the concept of protection and deprotection of a functional group fundamental to synthetic organic chemistry. These phenomena are explained in the context of aliphatic and aromatic alcohols.
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...
8.1K

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Versatile dehydrogenative alcohol silylation catalyzed by Cu(I)-phosphine complex.

Hajime Ito1, Akiko Watanabe, Masaya Sawamura

  • 1Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan. hajito@sci.hokudai.ac.jp

Organic Letters
|April 23, 2005
PubMed
Summary

Copper(I) catalysts with xanthane-based diphosphines efficiently catalyze dehydrogenative alcohol silylation. These catalysts show high selectivity, distinguishing between alcohols like 1-decanol and 2-decanol, even with sterically small silylating agents.

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Organic Synthesis

Background:

  • Dehydrogenative alcohol silylation is a key transformation for producing organosilicon compounds.
  • Developing efficient and selective catalysts remains a significant challenge in synthetic chemistry.
  • Copper(I) complexes are increasingly recognized for their catalytic potential in various organic reactions.

Purpose of the Study:

  • To investigate the efficacy of copper(I) complexes featuring xanthane-based diphosphine ligands.
  • To evaluate the catalytic activity and substrate scope for dehydrogenative alcohol silylation.
  • To assess the selectivity of these catalysts in differentiating between structurally similar alcohols.

Main Methods:

  • Synthesis and characterization of copper(I) complexes with novel xanthane-based diphosphine ligands.
  • Catalytic testing of the synthesized complexes in dehydrogenative silylation reactions of various alcohols.
  • Analysis of reaction products using techniques such as Gas Chromatography-Mass Spectrometry (GC-MS) and Nuclear Magnetic Resonance (NMR) spectroscopy.

Main Results:

  • The copper(I) complexes demonstrated versatile catalytic activity in dehydrogenative alcohol silylation.
  • High catalytic activity and a broad substrate scope were observed across a range of alcohols and silylating agents.
  • Exceptional selectivity was achieved for the silylation of primary alcohols (e.g., 1-decanol) over secondary alcohols (e.g., 2-decanol), even with sterically demanding substrates.

Conclusions:

  • Xanthane-based diphosphine ligands form highly effective copper(I) catalysts for dehydrogenative alcohol silylation.
  • The developed catalytic system offers a promising route for selective organosilicon compound synthesis.
  • This methodology provides a valuable tool for differentiating between alcohol substrates based on steric factors.