A Cationic Unsaturated Platinum(II) Complex that Promotes the Tautomerization of Acetylene to Vinylidene

Complex [PtMe(PMeAr)] (1), which contains a tethered terphenyl phosphine (Ar =2,6-(2,6-PrCH)CH), reacts with [H(EtO)]BAr (BAr =B[3,5-(CF)CH] ) to give the solvent (S) complex [PtMe(S)(PMeAr)] (2⋅S). Although the solvent molecule is easily displaced by a Lewis base (e.g., CO or CH) to afford the corr...

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Bibliographic Details
Authors: Ortega-Moreno, Laura, Peloso, Riccardo, López-Serrano, Joaquín, Iglesias-Sigüenza, Javier, Maya, Celia, Carmona, Ernesto
Format: article
Status:Versión aceptada para publicación
Publication Date:2017
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/148670
Online Access:http://hdl.handle.net/10261/148670
Access Level:Open access
Description
Summary:Complex [PtMe(PMeAr)] (1), which contains a tethered terphenyl phosphine (Ar =2,6-(2,6-PrCH)CH), reacts with [H(EtO)]BAr (BAr =B[3,5-(CF)CH] ) to give the solvent (S) complex [PtMe(S)(PMeAr)] (2⋅S). Although the solvent molecule is easily displaced by a Lewis base (e.g., CO or CH) to afford the corresponding adducts, treatment of 2⋅S with CH yielded instead the allyl complex [Pt(η-CH)(PMeAr)] (6) via the alkyne intermediate [PtMe(η-CH)(PMeAr )] (5). Deuteration experiments with CD, and kinetic and theoretical investigations demonstrated that the conversion of 5 into 6 involves a Pt-promoted HC≡CH to :C=CH tautomerization in preference over acetylene migratory insertion into the Pt−Me bond.

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