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η12-P-Pyrazolylphosphaalkene Complexes of Ruthenium(0)

Department of Chemistry, University of Sussex, Brighton BN1 9QJ, UK
Author to whom correspondence should be addressed.
Academic Editor: Lee J. Higham
Inorganics 2016, 4(4), 30;
Received: 9 September 2016 / Revised: 23 September 2016 / Accepted: 27 September 2016 / Published: 30 September 2016
(This article belongs to the Special Issue Organophosphorus Chemistry 2016)
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An extended range of novel ruthenium phosphaalkene complexes of the type [Ru{η1-N2-P,C-P(pz′)=CH(SiMe2R)}(CO)(PPh3)2] (R = Tol, C6H4CF3-p; pz′ = pzMe2, pzCF3, pzMe,CF3; R = Me, C6H4CF3-p; pz′ = pzPh) have been prepared from the respective ruthenaphosphaalkenyls [Ru{P=CH(SiMe2R)}Cl(CO)(PPh3)2] upon treatment with Lipz′. Where R = C6H4CF3-p and pz′ = pzMe2 the complex is characterized by single crystal X-ray diffraction, only the second example of such species being structurally characterized. This indicates enhanced pyramidalisation of the alkenic carbon center when compared with precedent data (R = Me, pz′ = pz) implying an enhanced Ru→π*PC contribution, which can be correlated with the greater donor power of pzMe2. This is similarly reflected in spectroscopic data that reveal significant influence of the pyrazolyl substituents upon the phosphaalkene, stronger donors imparting significantly enhanced shielding to phosphorus; in contrast, a much lesser influence if noted for the silyl substituents. View Full-Text
Keywords: phosphorus; phosphaalkene; phosphaalkenyl; pi-complex; pyrazolate phosphorus; phosphaalkene; phosphaalkenyl; pi-complex; pyrazolate

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Greenacre, V.K.; Crossley, I.R. η12-P-Pyrazolylphosphaalkene Complexes of Ruthenium(0). Inorganics 2016, 4, 30.

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