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Stabilization of Pentaphospholes as η5 -coordinating Ligands.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-09-21 , DOI: 10.1002/anie.202011571
Christoph Riesinger 1 , Gábor Balázs 1 , Michael Bodensteiner 1 , Manfred Scheer 1
Affiliation  

Electrophilic functionalisation of [Cp*Fe(η5‐P5)] (1) yields the first transition‐metal complexes of pentaphospholes (cyclo‐P5R). Silylation of 1 with [(Et3Si)2(μ‐H)][B(C6F5)4] leads to the ionic species [Cp*Fe(η5‐P5SiEt3)][B(C6F5)4] (2), whose subsequent reaction with H2O yields the parent compound [Cp*Fe(η5‐P5H)][B(C6F5)4] (3). The synthesis of a carbon‐substituted derivative [Cp*Fe(η5‐P5Me)][X] ([X]=[FB(C6F5)3] (4 a), [B(C6F5)4] (4 b)) is achieved by methylation of 1 employing [Me3O][BF4] and B(C6F5)3 or a combination of MeOTf and [Li(OEt2)2][B(C6F5)4]. The structural characterisation of these compounds reveals a slight envelope structure for the cyclo‐P5R ligand. Detailed NMR‐spectroscopic studies suggest a highly dynamic behaviour and thus a distinct lability for 2 and 3 in solution. DFT calculations shed light on the electronic structure and bonding situation of this unprecedented class of compounds.

中文翻译:

作为 η5 配位配体的五磷化合物的稳定性。

[Cp*Fe(η 5 ‐P 5 )] ( 1 )的亲电官能化产生了第一个五磷杂环化合物 (cyclo-P 5 R)的过渡金属配合物。1与[(Et 3 Si) 2 (μ-H)][B(C 6 F 5 ) 4 ] 的硅烷化产生离子物质 [Cp*Fe(η 5 ‐P 5 SiEt 3 )][B(C 6 F 5 ) 4 ] ( 2 ),其随后与H 2 O反应生成母体化合物[Cp*Fe(η 5 ‐P 5 H)][B(C 6 F 5 ) 4 ] ( 3 )。碳取代衍生物[Cp*Fe(η 5 ‐P 5 Me)][X] ([X] =[FB(C 6 F 5 ) 3 ] ( 4 a ), [B(C 6 F 5 ) 4 ] - ( 4 b )) 通过使用 [Me 3 O][BF 4 ] 和 B(C 6 F 5 ) 3或 MeOTf 和 [Li(OEt 2 ) 2的组合对1进行甲基化来实现][B(C 6 F 5 ) 4 ]。这些化合物的结构表征揭示了环-P 5 R配体的轻微包络结构。详细的核磁共振波谱研究表明,23在溶液中具有高度动态的行为,因此具有明显的不稳定性。DFT 计算揭示了这类前所未有的化合物的电子结构和键合情况。
更新日期:2020-09-21
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