フェニラセチレンで保護されたオルガンゴールドのクラスター.
Prasenjit Maity1, Hironori Tsunoyama, Miho Yamauchi
1Catalysis Research Center, Hokkaido University, Nishi 10, Kita 21, Sapporo 001-0021, Japan.
Journal of the American Chemical Society
|November 16, 2011
まとめ
研究者らは,フェニラセチレンを金塊に結合することによって,新しいオルガンゴールドクラスタを作成しました. このブレークスルーは,質量スペクトロメトリーによって確認された,定義された組成を持つ金ナノマテリアルの新しいクラスを提供します.
科学分野:
- ナノ材料科学 ナノ材料科学
- 有機金属化学 有機金属化学
- 表面化学について
背景:
- 単層で保護された黄金のクラスターは,触媒と医学において極めて重要です.
- 以前の方法では,クラスターの組成が定義されていないことが多かった.
- 結合性Au-C結合を持つオルガン・ゴールド・クラスタの開発は,合成的な課題となっています.
研究 の 目的:
- 直接的な金-炭素共立結合を持つ新種のオルガン・ゴールド・クラスターを合成する.
- これらの新しいクラスターの構成と安定性を特徴付ける.
- 金塊の安定化のためのリガンドとしてのフェニラセチレンの可能性を探求する.
主な方法:
- ポリビニルピロリドン (PVP) で安定した黄金のクラスターの合成.
- フェニラセチレン (PhCCH) をPVPで安定した金塊に結合する.
- マトリックスアシストレーザー脱吸収イオン化質量スペクトロメトリ (MALDI-MS) を使用した特徴付け.
主要な成果:
- Au-C共振結合 (オルガンゴールドクラスター) を有する単層で保護された黄金クラスターの成功合成.
- MALDI-MS.を介して,オルガンゴールド (Au:C(2) Ph) クラスタの安定した組成物の特定.
- フェニラセチレンが,安定した,共振的に機能した黄金のクラスターを作成するための効果的なリガンドであることの実証.
結論:
- Au-C共振結合を持つ新種のオルガン・ゴールド・クラスターが合成されました.
- この研究は,安定したオルガン・ゴールド・クラスターの組成に対する最初の質量スペクトロメトリの証拠を提供します.
- この研究は,機能化された金のナノ材料を設計するための新しい道を開きます.
関連する概念動画
Protecting Groups for Aldehydes and Ketones: Introduction
Protecting groups are compounds that can bind to a specific functional group in the presence of other functional groups to protect them from undesired chemical reactions. These compounds can selectively bind to particular functional groups and advance chemoselective reactions in polyfunctional systems (Figure 1). After the functional group has served its purpose, it is removed by reacting it with specific compounds.
Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones
Acetals are formed by reacting two equivalents of alcohol with carbonyl compounds like aldehydes or ketones. Acetals are unaffected by bases, nucleophiles, oxidizing agents, and reducing agents. They serve as protecting groups for aldehydes and ketones. Acetals can be easily formed and also easily removed via mild acid hydrolysis.
In the presence of multiple functional groups, when selective reduction of one group over the other is desired, groups like aldehydes and ketones that form acetals...
In the presence of multiple functional groups, when selective reduction of one group over the other is desired, groups like aldehydes and ketones that form acetals...
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Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...
Properties of Organometallic Compounds
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
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.
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...


