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首页> 外文期刊>Chemistry: A European journal >Reactive Intermediates: A Transient Electrophilic Phosphinidene Caught in the Act
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Reactive Intermediates: A Transient Electrophilic Phosphinidene Caught in the Act

机译：活性中间体：该法中涉及的瞬态亲电性膦亚基

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摘要

Phosphinidene complexes [LnM=PR][1] are fascinating reagents akin to the isoelectronic carbenes [LnM=CR2][2] that have made a stunning impact on the preparative and industrial scale syntheses of small molecules and polymeric materials. It is tempting to extend the relationship for lowvalent species that is based on the similar electronegativities of the element phosphorus and the diagonally related carbon to these transition-metal complexes.[3] It has already been established that phosphinidene complexes can be classified as electrophilic (Fischer-type) or nucleophilic (Schrock-type) at phosphorus depending on the nature of the ligands L;[4] electron-withdrawing ligands with strong pacceptor capacity (e.g., CO) reduce the charge concentration on the phosphorus atom and therefore enhance its electrophilicity,whereas strong s-donor ligands (e.g., Cp) increase the electron density at phosphorus and thereby increase its nucleophilic properties. Proper characterisation of these complexes assists in understanding their chemical potential.
机译：次膦化合物[LnM = PR] [1]是类似于等电子碳烯[LnM = CR2] [2]的迷人试剂，它们对小分子和聚合物材料的制备和工业规模合成产生了惊人的影响。基于元素磷和与对角线相关的碳与这些过渡金属配合物的相似的电负性，试图扩展低价物种之间的关系[3]。已经确定，根据配体L的性质，次膦配合物在磷处可分为亲电性（费歇尔型）或亲核性（施洛克型）; [4]具有强受体能力的吸电子配体（例如， CO）降低了磷原子上的电荷浓度，因此增强了其亲电性，而强大的s-给体配体（例如Cp）增加了磷处的电子密度，从而增强了其亲核性能。这些配合物的正确表征有助于理解其化学潜能。

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