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

Title A Cationic Unsaturated Platinum(II) Complex that Promotes the Tautomerization of Acetylene to Vinylidene.
Authors L. Ortega-Moreno; R. Peloso; J. López-Serrano; J. Iglesias-Sigüenza; C. Maya; E. Carmona
Journal Angew Chem Int Ed Engl
DOI 10.1002/anie.201700087
Abstract

Complex [PtMe2 (PMe2 ArDipp2 )] (1), which contains a tethered terphenyl phosphine (ArDipp2 =2,6-(2,6-(i) Pr2 C6 H3 )2 C6 H3 ), reacts with [H(Et2 O)2 ]BArF (BArF(-) =B[3,5-(CF3 )2 C6 H3 ]4(-) ) to give the solvent (S) complex [PtMe(S)(PMe2 ArDipp2 )](+) (2?S). Although the solvent molecule is easily displaced by a Lewis base (e.g., CO or C2 H4 ) to afford the corresponding adducts, treatment of 2?S with C2 H2 yielded instead the allyl complex [Pt(?(3) -C3 H5 )(PMe2 ArDipp2 )](+) (6) via the alkyne intermediate [PtMe(?(2) -C2 H2 )(PMe2 ArDipp2 )](+) (5). Deuteration experiments with C2 D2 , and kinetic and theoretical investigations demonstrated that the conversion of 5 into 6 involves a Pt(II) -promoted HC?CH to :C=CH2 tautomerization in preference over acetylene migratory insertion into the Pt-Me bond.

Citation L. Ortega-Moreno; R. Peloso; J. López-Serrano; J. Iglesias-Sigüenza; C. Maya; E. Carmona.A Cationic Unsaturated Platinum(II) Complex that Promotes the Tautomerization of Acetylene to Vinylidene.. Angew Chem Int Ed Engl. 2017;56(10):27722775. doi:10.1002/anie.201700087

Related Elements

Platinum

78 Pt 195.084000000 Platinum

See more Platinum products. Platinum (atomic symbol: Pt, atomic number: 78) is a Block D, Group 10, Period 6 element with an atomic weight of 195.084. The number of electrons in each of platinum's shells is [2, 8, 18, 32, 17, 1] and its electron configuration is [Xe] 4f14 5d9 6s1. The platinum atom has a radius of 139 pm and a Van der Waals radius of 175 pm. Platinum Bohr ModelElemental PlatinumPlatinum was discovered and first isolated by Antonio de Ulloa in 1735. It is one of the rarest elements in the earth's crust, occurring at a concentration of only 0.005 ppm. Platinum is found uncombined as a free element and alloyed with iridium as platiniridium. In its elemental form, platinum has a grayish white appearance. It is highly resistant to corrosion: the metal does not oxidize in air at any temperature. It is generally non-reactive, even at high temperatures. The origin of the name "platinum" comes from the Spanish word platina, meaning silver.

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Organometallics
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