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関連する概念動画

Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

8.7K
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.
8.7K
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

18.7K
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.
18.7K
Nuclear Transmutation03:20

Nuclear Transmutation

17.9K
Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
17.9K
Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

8.3K
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...
8.3K
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

Radical 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...
1.9K
Nuclear Stability03:18

Nuclear Stability

19.4K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
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Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
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イリジウム安定化ボレニウム中間体

Mustapha Hamdaoui1, Fan Liu1, Yann Cornaton2

  • 1Department of Chemistry, Zheijang University, Hangzhou 310027, China.

Journal of the American Chemical Society
|September 29, 2022
PubMed
まとめ
この要約は機械生成です。

研究者らは,ヒドロボランを活性化し,ユニークなボレニウムイオンを形成する新しいイリジウムボロンクラスター複合体を発見しました. この発見は異常な相互作用を明らかにし,ボロンクラスターの表面に新しい"ケージウォーキング"メカニズムを開始します.

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IridiumIII Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II
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科学分野:

  • 有機金属化学
  • ボロンクラスター化学
  • 無機化学

背景:

  • 多面体ボロンクラスターは 反応性のある種を安定させるための鍵です
  • E-H結合の活性化などの 化学的な問題への解決策を提示します

研究 の 目的:

  • 多面体ボロンクラスターを基に新しい有機金属系を調査する.
  • イリジウム・ボロン・クラスター・コンプレックスによるヒドロボランのB-H活性化を調査する.
  • 結果となる新しいボロンカチオン (ボレニウム) とその相互作用を特徴付ける.

主な方法:

  • 簡単でクリーンなBH活性化反応です
  • NMR光学と元素解析を用いた新しい化合物の特徴化.
  • 単結晶X線 difraktionとX線光電子スペクトロスコーピーは,主要な化合物について.
  • 反応メカニズムの解明のための理論的方法

主要な成果:

  • 新しいイリジウム・ボロン・クラスター・コンプレックスは合成され,ヒドロボランと反応した.
  • 前例のない移行金属安定化ボロンカチオン (ボレニウム) が形成された.
  • 異常な分子内B·H相互作用が観察され,停止された挿入として提案された.
  • イリジウム"ケージウォーキング"の証拠は,H-D交換によってサポートされています.

結論:

  • この研究は,イリジウム・ボロン・クラスターによって安定した新しいボレニウム中間物質を報告している.
  • 細胞内B·H相互作用は"ケージウォーキング"の重要な特徴と初期段階として特定されています.
  • この発見は,ボロンクラスター化学と有機金属触媒の反応性とメカニズムの理解を進めている.