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Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene01:17

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The electrophilic addition of hydrogen halides such as HBr to alkenes and nonconjugated dienes gives a single product as per Markovnikov’s rule.
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Regioselectivity and Stereochemistry of Hydroboration02:36

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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
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Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

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Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
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Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
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Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
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Cu(II)-Mediated C(sp(2))-H Hydroxylation.

Shang-Zheng Sun1, Ming Shang2, Hong-Li Wang2

  • 1Department of Chemistry, Innovative Drug Research Center, Shanghai University , 99 Shangda Road, Shanghai 200444, China.

The Journal of Organic Chemistry
|August 12, 2015
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Summary
This summary is machine-generated.

A new copper-catalyzed reaction enables ortho-C-H hydroxylation using a removable directing group and molecular oxygen as the oxidant. This method shows high functional group tolerance and is improved by water.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Direct C-H functionalization is a key strategy in organic synthesis.
  • Hydroxylation of C-H bonds is challenging, especially with high selectivity.
  • Developing efficient catalytic systems for C-H hydroxylation is an active research area.

Purpose of the Study:

  • To develop a novel copper(II)-mediated ortho-C-H hydroxylation reaction.
  • To utilize a removable directing group strategy for regioselective functionalization.
  • To employ molecular oxygen as a green oxidant.

Main Methods:

  • Copper(II) catalysis.
  • Employing a removable directing group for ortho-functionalization.
  • Utilizing molecular oxygen (O2) as the oxidant.
  • Investigating the role of water in the reaction.

Main Results:

  • Successfully developed a Cu(II)-mediated ortho-C-H hydroxylation.
  • The reaction demonstrated significant functional group tolerance.
  • Molecular oxygen was identified as a crucial oxidant for reactivity.
  • Water was found to substantially improve the reaction efficiency.

Conclusions:

  • A novel and efficient method for ortho-C-H hydroxylation has been established.
  • The developed methodology offers a valuable tool for organic synthesis.
  • The use of O2 and the beneficial effect of water highlight potential for greener chemistry.