最初のシラスタンネ >si=sn<は,より重いグループ14の元素の新しい二重結合系である
Akira Sekiguchi1, Rika Izumi, Vladimir Ya Lee
1Department of Chemistry, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan. sekiguch@staff.chem.tsukuba.ac.jp
Journal of the American Chemical Society
|December 12, 2002
まとめ
研究者は,ユニークなSi=Sn二重結合を持つ新しいシリコン-チンの化合物を合成しました. この高度に反応性の高い分子は,X線結晶学によって確認されたトランスベント構造を示し,シリコン-チンの化学に関する洞察を提供します.
科学分野:
- 有機金属化学 有機金属化学
- シリコン-チンの化学
- マテリアルサイエンス 材料科学
背景:
- ディカルコゲン化合物とそのユニークな結合特性には大きな関心があります.
- 低値性シリコン化合物の合成と特徴付けは拡大しています.
- 主なグループ化学における新しい結合モチーフの探求は極めて重要です.
研究 の 目的:
- シリコン-チン (Si=Sn) 二重結合を備えた新しい化合物を合成し,特徴づけること.
- 合成されたシラスタンネンの構造的性質を調査する.
- Si=Sn二重結合の反応性と電子特性を探求する.
主な方法:
- bis[di-tert-butyl(methyl) silyl]dilithiosilaneがダイクロロビス ((2,4,6-トライソプロピルフェニル) スタナンと反応する.
- X線結晶学による製品の分離と特徴付け.
- 実験結果を裏付けるための理論的計算.
主要な成果:
- 濃紫色で空気や水分に敏感なシラスタンネン (1,1-bis[di-tert-butyl(methyl) シリル]-2,2-bis(2,4,6-トリゾプロピルフェニル) -1-シラ-2-スタナエーテンの合成が成功しました.
- X線結晶学では,特定の結合長と角度 (Si=Sn結合長:2.4188(14) Å,Siの曲折角度: 26.2°,Snの曲折角度: 9.6°,曲折角度: 34.6°) を有するトランス曲折構造が明らかになった.
- 実験的および理論的データは,極性Siδ−=Snδ+二重結合を示し,反応性に影響する.
結論:
- Si=Sn二重結合を持つ新種のシラスタンネンが合成され,構造的に特徴づけられました.
- トランスベントの幾何学と結合特性は,シリコン-チンの多重結合に関する基本的な洞察を提供します.
- Si=Sn結合の観測された極性は,理論的な計算によって検証された加法反応における地域選択性を決定する.
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