鉄二水素触媒によるメタンの選択的酸化
Chhaya Thadhani1, Rahul Kalita1, Bharti Rana1
1Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India. kmanna@chemistry.iitd.ac.in.
Chemical communications (Cambridge, England)
|September 3, 2025
まとめ
化学選択によるメタンの酸化は,ジルコニウム金属有機枠 (MOF) に閉じ込められた新しい鉄触媒を用いて達成された. この方法はメタンとHBpinからメチルボロン酸ピナコールエステルを効率的に生成します.
科学分野:
- 有機金属化学
- キャタリシス
- 材料科学
背景:
- オーガノボロン化合物は有価な合成中間物質である.
- メタンの直接的機能化は有機合成における重要な課題である.
- メタル・オーガニック・フレームワーク (MOF) は,触媒応用のためのユニークな環境を提供します.
研究 の 目的:
- メタンのボリル化のための化学選択的方法を開発する.
- UiO-MOF内の閉じ込められた単核鉄 (III) 二水素触媒の有効性を調査する.
- メタンからメチルボロン酸ピナコールエステルを合成する
主な方法:
- 単核鉄 (III) 二水素触媒のサポートとして多孔性ジルコニウム UiO-MOF を使用する.
- 特定の温度条件 (185 °C) で HBpin をボロン源として反応する.
- 製品と触媒の性能について
主要な成果:
- メタン (CH4) の効率的なモノボリレーションを達成した.
- 85%のメチルボロン酸ピナコールエステルを得ました.
- 累計売上高 (TON) は 921 台に達した.
結論:
- UiO-MOFの閉じ込められた単核鉄 (III) 二水素触媒は,メタンのボリル化に有効である.
- この触媒システムは,オルガノボロン合成のための有望な経路を提供します.
- この方法は,価値あるボロナートを生産するための高収量と効率性を提供します.
関連する概念動画
03:08Hydroboration-Oxidation of Alkenes
8.9K
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.
8.9K
02:36Regioselectivity and Stereochemistry of Hydroboration
8.4K
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...
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...
8.4K
01:26Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
1.9K
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...
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...
1.9K
02:47Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
18.9K
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.
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.
18.9K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
8.1K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
8.1K
02:15Preparation of Alcohols via Addition Reactions
6.4K
Overview
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...
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...
6.4K