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Hydroboration-Oxidation of Alkenes03:08

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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
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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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The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
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Drug design is a dynamic field that involves discovering and developing new medications based on specific biological targets. This process heavily relies on structure-activity relationships (SAR) and quantitative structure-activity relationships (QSAR) to guide the design and optimization of efficient drugs.
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Updated: Jul 8, 2025

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Borirenes and Boriranes: Development and Perspectives.

Junyi Wang1, Qing Ye2,3

  • 1Department of chemistry, The Hong Kong University of Science and Technology Clear Water Bay, Kowloon, Hong Kong.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 12, 2023
PubMed
Summary
This summary is machine-generated.

Borirenes and boriranes are strained three-membered rings with unique boron-carbon structures. Their synthesis and reactivity, especially novel fused derivatives, offer exciting potential as synthons and in materials science.

Keywords:
BoriraneBorireneCarboraneLewis AcidityRing Strain

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Area of Science:

  • Organoboron Chemistry
  • Strained Ring Systems
  • Synthetic Chemistry

Background:

  • Borirene and borirane are three-membered rings containing boron and carbon, analogous to cyclopropane and cyclopropene.
  • These compounds exhibit Lewis acidity and unique reactivity due to ring strain and the boron center.

Purpose of the Study:

  • To review the synthesis and reactivity of borirene and borirane derivatives.
  • To highlight novel perspectives from benzoborienes and carborane-fused boriranes.
  • To encourage the design of new molecules and exploration of applications.

Main Methods:

  • Literature review of synthetic methodologies for borirenes and boriranes.
  • Analysis of reported reactivity patterns, including ring-opening and coordination chemistry.
  • Discussion of structure-property relationships in novel fused systems.

Main Results:

  • Borirenes and boriranes display Lewis acidity and ring-opening reactivity.
  • Benzoborienes and carborane-fused boriranes exhibit enhanced ring-expanding reactivity.
  • These strained compounds serve as valuable BC2 synthons and potential building blocks for luminescent materials.

Conclusions:

  • Borirene and borirane chemistry is a dynamic field with significant potential.
  • Novel fused derivatives offer unique reactivity and properties.
  • Further research into their synthesis and applications is warranted, particularly in materials science.