What is it about?
Cyclopentadienyl anion (Cp-) is a versatile ligand in organometallic chemistry. Quantum chemical study reveals that the phosphorus analogues of Cp- retain more than 86.0% aromaticity relative to Cp-. A rather dramatic result is that the pentaphosphorus analogue P5- is as aromatic as the carbocyclic cyclopentadienyl anion
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Why is it important?
The present work is the first systematic study of aromaticity in the phosphorus analogues of cyclopentadienyl anion aimed at explaining the capability of these species to participate as ligands in the formation of organometallic complexes.
Perspectives
It is remarkable that a stable carbon-free sandwich complex [(P5)2Ti]2− was synthesised and characterized experimentally and theoretically in 2002 (DOI: 10.1126/science.1067325). Numerous organometallic compounds containing cyclo-P5 and its analogues have been synthesized in the recent years.
E.J. Padma Malar
University of Madras
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This page is a summary of: Study of aromaticity in phosphorus analogs of cyclopentadienyl anion, The Journal of Organic Chemistry, June 1992, American Chemical Society (ACS),
DOI: 10.1021/jo00039a034.
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