パルフッ素アルキルコバルト (III) フッ素とビス (Perfluoroalkyl) コンプレックス:触媒性フッ素化と選択的二酸化炭素形成
Matthew C Leclerc1, Julia M Bayne1, Graham M Lee1
1Department of Chemistry and Biomolecular Sciences and Centre for Catalysis Research and Innovation, University of Ottawa , 30 Marie Curie, Ottawa, Ontario K1N 6N5, Canada.
Journal of the American Chemical Society
|December 18, 2015
まとめ
新しいコバルト複合物は,フルオロアルキルリガンドで,化反応で触媒的活性を示している. これらの複合体は,フルオロアルキル鎖の延長のための二酸化炭素中間物質を生成し,フッ素分子とポリマーを合成する可能性を秘めています.
科学分野:
- 有機金属化学
- フッ素化学
- キャタリシス
背景:
- パーフッ素アルキルコバルト複合体は合成化学において有価である.
- 新しい化方法の開発には,その反応性を理解することが重要です.
研究 の 目的:
- 新しいパーフルオロアルキルコバルト (III) フッ化物複合体を合成し,特徴づけること.
- 化反応における彼らの触媒的活動を調査する.
- コバルト (III) ビス (perfluoroalkyl) 複合体とその二酸化炭素中間物質の反応性を調べる.
主な方法:
- 元素分析
- 多核性NMRスペクトル
- X線結晶学
- 粉末X線微分
- 計算による研究
主要な成果:
- 4つのフルオロアルキルコバルト (III) フッ化物複合体を合成し,特徴づけました.
- コバルトフッ化物 (19) Fの有意な化学的シフトが観測され,計算的に分析された.
- p-トルオイル塩化物の化における触媒的活性が実証されている.
- 合成コバルト (III) ビス (perfluoroalkyl) 複合体および生成コバルト二酸化炭素複合体.
- 鎖の延長のための perfluoroalkyl 断片にdifluorocarbeneの挿入を示した.
結論:
- 合成されたコバルト複合物は,フッ素化のための触媒的可能性を示します.
- これらの複合体から派生した二酸化炭素中介物は,パーフルオアルキル鎖を長引くために使用することができる.
- これらの発見は,フッ素分子とフッ素ポリマーの合成のための触媒的応用についての洞察を提供します.
関連する概念動画
01:13Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
8.0K
Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
8.0K
01:14Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene
3.9K
Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
3.9K
02:46Halogenation of Alkenes
21.1K
Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
21.1K
03:01Halogens
24.2K
Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group.
24.2K
02:42Valence Bond Theory
11.7K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.7K
03:02Colors and Magnetism
14.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.6K