Beryllium Phosphine Complexes: Synthesis, Properties, and Reactivity of (PMe₃)₂BeCl₂ and (Ph₂PC₃H₆PPh₂)BeCl₂

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• 作者：Dr. Magnus R. Buchner ; Matthias Mü ; ller and Stefan S. Rudel
• 刊名：Angewandte Chemie International Edition
• 出版年：2017
• 出版时间：January 19, 2017
• 年：2017
• 卷：56
• 期：4
• 页码：1130-1134
• 全文大小：846K
• ISSN：1521-3773

文摘

The directed synthesis, spectroscopic properties, and reactivity of bis(trimethylphosphine) beryllium dichloride (1) and bis(diphenylphosphino)propane beryllium dichloride (2) are reported, including the crystal structure of (PMe₃)₂BeCl₂ (1). These four-coordinate beryllium compounds can be alkylated with n-butyllithium (ⁿBuLi) to give three-coordinate (Ph₂PC₃H₆PPh₂)BeⁿBu₂ (3) and (PMe₃)BeⁿBu₂ (4). PMe₃ can be removed from (PMe₃)BeⁿBu₂ (4) in vacuo to yield [ⁿBu₂Be]₂ (5). For the first time, the presence of [ⁿBu₂Be]₂ as a dimer in solution, which has been postulated for decades, could be observed spectroscopically. This novel, ether-free pathway provides access to beryllium dialkyl compounds that have never been in contact with oxygen-atom-containing reagents or solvents. This “freeness from oxygen” is crucial for semiconductor applications where oxygen is often unwanted and must be avoided at all costs.