シリリウムアレンアダクト:実験的・理論的研究
Muhammad Farooq Ibad1, Peter Langer, Axel Schulz
1Abteilung Anorganische Chemie, Institut für Chemie, Universität Rostock, Albert-Einstein-Strasse 3a, D-18059 Rostock, Germany.
Journal of the American Chemical Society
|November 17, 2011
まとめ
新しいトリメチルシリルアレン塩が合成され,特徴づけられました. 分解経路は,新しいフッ素イオンと反応性フッ素化物種を明らかにし,オルガノシリコン化学と結合に関する洞察を提供しました.
科学分野:
- 有機金属化学 有機金属化学
- 超分子化学 超分子化学
- フロアンの化学的性質
背景:
- 弱調整アニオンを持つ溶剤調整トリメチルシリルアレン塩は,非共性相互作用を理解するために興味があります.
- このような複合物の反応性および分解経路は,新しい合成方法論の開発において極めて重要です.
研究 の 目的:
- 一連の溶媒調整 [Me(3) シアレン][B(C(6) F(5)) ((4) ] 塩を合成し,特徴づけました.
- これらの塩の分解産物と反応機構を研究する.
- 置換された[Me(3) Si·arene][B(C(6) F(5)) ((4) ]複合体の構造と結合の側面を探求する.
主な方法:
- トリメチルシリルアレン塩の合成と完全な特徴付け.
- 構造と結合の特徴を決定するX線結晶学.
- 電子効果を分析するための実験的および理論的方法 (電荷移転,部分電荷,トリメチルシリル親和)
主要な成果:
- 様々な[Me(3) シアレン][B(C(6) F(5)) 塩の製造と特徴付けに成功しました.
- 分解産物としてのビシリ化フッ素イオン[Me(3) Si-F-SiMe(3) ](+) の観察と分離.
- フルオロニウム塩,トリス・ペンタフルオロフェニル・ボラン,および分解時に反応性のある"C6F4"種を特定し,二硫化炭素で閉じ込めることができます.
- X線データは,非平面的なアレン部分と有意なカチオン-アニオン相互作用を明らかにしました.
- 理論的分析は,アレン置換の程度とパターンが影響する安定化誘導効果を示した.
結論:
- この研究では,新しいトリメチルシリルアレン塩を成功裏に合成し,特徴づけ,複雑な分解経路を明らかにしました.
- フッ素イオンの形成と反応性フッ素化物種の形成は,オルガノシリコンとフッ素化学における新しい道筋を強調しています.
- 電子効果と非共振相互作用を理解することは,これらの化合物の安定性と反応性を予測する上で鍵となるものです.
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関連する概念動画
02:26Preparation and Reactions of Sulfides
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
02:38Electrophilic Addition to Alkynes: Halogenation
Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
01:16Cycloaddition Reactions: Overview
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
02:42Acidity of 1-Alkynes
The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
02:37Structure and Physical Properties of Alkynes
Introduction:
In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
The simplest alkyne is ethyne, or...
In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
The simplest alkyne is ethyne, or...
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01:16[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.