Synthesis, characterization and reactivity of platinum-substituted ketenes [PtX{η-C(PPh3)CO}L2]BF4, (X=Me, Cl; L2=1,5-cyclooctadiene, 1,2-bis(diphenylphosphino)ethane, cis-1,2-bis(diphenylphosphino)ethene). Steric and electronic effects of the ancillary ligands |
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Authors: | Roberta Bertani Luciano Pandolfo Livio Zanotto |
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Institution: | a Dipartimento dei Processi Chimici di Ingegneria, Università di Padova, Via Marzolo, 9. I-35131, Padova, Italy b Dipartimento di Chimica, Università della Basilicata, Via N. Sauro, 85. I-85100, Potenza, Italy c CSTCMET CNR, Via Marzolo, 9. I-35131, Padova, Italy |
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Abstract: | Ketenylidenetriphenylphosphorane, Ph3PC=C=O, 1, has been used to synthesize platinum-substituted ketenes PtMe{η1-C(PPh3)CO}L2]BF4, 2a, b (L2=1,5-cyclooctadiene, cod (a), 1,2-bis(diphenylphosphino)ethane, diphos (b)). Parent compound PtCl{η1-C(PPh3)CO}L2]BF4, 3, with L2=cis-1,2-bis(diphenylphosphino)ethene, diphoe, was also synthesized, which is stable only at low temperature. The stability of 2 and 3 and the reactivity of the C=C=O moiety have been examined and discussed in terms of the electronic and steric characteristics of the ancillary ligands, also taking into account the reactivity of the ‘PtXL2’ fragment with other carbonyl stabilized phosphorus ylides, Ph3PCHCOR (R=Me, Ph, OMe, OEt). |
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Keywords: | Platinum complexes Ketenes Ylides Ketenylidenetriphenylphosphorane Metal substituted ketenes η1-ketenyls Steric hindrance |
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