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Published on: December 6, 2021
Metal-Free Boron-Containing Heterogeneous Catalysts
1State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou, 350002, P.R. China.
Boron-based catalysts offer sustainable, cost-effective alternatives to metal catalysts. This review highlights recent advances in boron-containing metal-free catalysts for electrocatalysis, thermal catalysis, and photocatalysis.
Area of Science:
- Materials Science
- Catalysis
- Chemistry
Background:
- Metal-free catalysts offer advantages like lower cost, higher reliability, and sustainability compared to metal or metal oxide catalysts.
- Boron-containing compounds are a promising class of nonmetal materials with unique catalytic properties.
Purpose of the Study:
- To present recent advances in boron-containing metal-free catalysts.
- To discuss the role of boron in various catalytic applications, including electrocatalysis, thermal catalysis, and photocatalysis.
Main Methods:
- Review of recent literature on boron-containing catalytic materials.
- Analysis of binary and ternary boron-containing compounds.
- Discussion of catalytic mechanisms and performance.
Main Results:
- Recent progress in developing diverse boron-containing metal-free catalysts.
- Demonstration of boron's crucial role in enhancing catalytic activity across different applications.
- Identification of key structure-activity relationships for boron-based catalysts.
Conclusions:
- Boron-containing compounds represent a significant advancement in metal-free catalysis.
- These materials show great potential for future applications in electrocatalysis, thermal catalysis, and photocatalysis.
- Further research into boron-based catalysts could lead to substantial impact in sustainable chemistry.
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Hydroboration-Oxidation of Alkenes
Properties of Organometallic Compounds
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
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.
Regioselectivity and Stereochemistry of Hydroboration
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.
Catalysis

