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Dive into the research topics where Angelino Doppiu is active.

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Featured researches published by Angelino Doppiu.


Chemical Communications | 2011

Simple synthetic routes to ruthenium–indenylidene olefin metathesis catalysts

César A. Urbina-Blanco; Simone Manzini; Jessica Pérez Gomes; Angelino Doppiu; Steven P. Nolan

An efficient synthetic protocol involving reactions between the free carbene and [RuCl(2)(PPh(3))(2)(Ind)] followed by addition of pyridine leads to the isolation of olefin metathesis active [RuCl(2)(L)(Py)(Ind)] (L = SIMes and SIPr) complexes. This novel approach circumvents the use of costly tricyclohexylphosphine.


Australian Journal of Chemistry | 2013

Silica Immobilized Hoveyda Type Pre-Catalysts: Convenient and Reusable Heterogeneous Catalysts for Batch and Flow Olefin Metathesis

Wladimir Solodenko; Angelino Doppiu; René Frankfurter; Carla Vogt; Andreas Kirschning

Two Hoveyda type ruthenium metathesis precatalysts, Umicore M51 and Umicore M71 SIMES, were immobilized on commercial silica in a simple and fast procedure through direct interaction with the support surface. These precatalysts exhibited good activity in ring-closing, cross, and enyne metathesis reactions and were stable in terms of reusability to be used for consecutive runs under both batch and flow conditions. In non-polar media, the catalytic activity of the precatalysts is truly based on a heterogeneous species, and the contamination of the products with ruthenium was very low with respect to starting catalyst (0.003–0.01 %; 0.13–0.44 ppm). If necessary, such as in solvents like toluene, the ruthenium content can easily be reduced to levels below 0.5 ppm by treatment of the crude metathesis products with the commercial scavenger QuadraSil AP or by use of an additional QuadraSil AP scavenger cartridge under flow conditions.


Topics in Catalysis | 2014

Synthesis Optimization and Catalytic Activity Screening of Industrially Relevant Ruthenium-Based Metathesis Catalysts

Angelino Doppiu; Frédéric Caijo; Fabien Tripoteau; Savinien Bompard; Christophe Crévisy; Marc Mauduit

Olefin metathesis is a powerful catalytic reaction that has a huge potential in the pharmaceutical, polymer and specialty chemicals industries. Cost-effective industrial applications require large-scale availability of catalyst precursors which combine high activity, high selectivity and long life-time. Among the known numerous families of olefin metathesis catalysts, the Umicore M7-catalyst family represents a novel class of Hoveyda-type complexes showing excellent chemical stabilities and modular activity profiles. Relevant aspects related to their industrial synthesis as well as their catalytic performance in valuable olefin metathesis transformations are overviewed here.


Acta Crystallographica Section E-structure Reports Online | 2008

(Sp)-1-Diphenyl­phosphanyl-2-{(S)-[2-(diphenyl­phosphan­yl)phen­yl]hydroxy­meth­yl}ferrocene

Jan W. Bats; Angelino Doppiu; Andreas Rivas Nass; A. Stephen K. Hashmi

The absolute configuration of the title compound, [Fe(C5H5)(C36H29OP2)], is Sp at the ferrocene group and S at the asymmetric C atom. Both P atoms have a trigonal–pyramidal conformation. There is a short intramolecular C—H⋯P contact with an H⋯P distance of 2.56 Å. The hydroxy group is involved in an intramolecular O—H⋯πphenyl interaction. The crystal packing shows five very weak intermolecular C—H⋯π contacts, with H⋯Cg distances between 3.26 and 3.39 Å (Cg is the centroid of a phenyl or cyclopentadienyl ring).


Acta Crystallographica Section E-structure Reports Online | 2011

Dichlorido(3-phenyl­indenyl­idene)bis­(triphenyl­phosphane)ruthenium(II) tetra­hydro­furan disolvate

Jan W. Bats; Jessica Pérez Gomes; Angelino Doppiu; A. Stephen K. Hashmi

The RuII atom in the title compound, [RuCl2(C15H10)(C18H15P)2]·2C4H8O, has a distorted square-pyramidal conformation. The P and Cl atoms are at the base of the pyramid and the Ru—Cindenylidene bond is in the axial position. The two Cl ligands and the two phosphane ligands are in trans positions. The Cl—Ru—Cl and P—Ru—P angles are 157.71 (2) and 166.83 (2)°, respectively. The two independent tetrahydrofuran (THF) solvent molecules are disordered. One THF molecule was refined using a split-atom model. The second THF molecule was accounted for by using program PLATON/SQUEEZE [Spek (2009 ▶). Acta Cryst. D65, 148–155]. The molecular conformation shows three intramolecular C—H⋯Cl contacts and two C—H⋯π interactions while the crystal packing features an intermolecular C—H⋯Cl contact and two very weak intermolecular C—H⋯π contacts.


Acta Crystallographica Section E-structure Reports Online | 2008

(R p)-1-{(R)-(Dimethyl­amino)[2-(diphenyl­phosphan­yl)phen­yl]methyl}-2-(diphenyl­phosphan­yl)ferrocene chloro­form solvate

Jan W. Bats; Andreas Rivas Nass; Angelino Doppiu; Ralf Karch; A. Stephen K. Hashmi

The absolute configuration of the title molecule, [Fe(C5H5)(C38H34NP2)]·CHCl3, is R,R p. The molecular structure is similar to the structure of the solvent-free compound [Fukuzawa, Yamamoto & Kikuchi (2007 ▶). J. Org. Chem. 72, 1514–1517], but some torsion angles about the P—Cphenyl bonds differ by up to 25°. The P atoms and the N atom have a distorted trigonal-pyramidal geometry. The chloroform solvate group donates a C—H⋯π bond to the central benzene ring and is also involved in six intermolecular C—H⋯Cl contacts with H⋯Cl distances between 2.96 and 3.13 Å.


Organometallics | 2003

Novel [2+2+1] Cyclotrimerization of Alkynes Mediated by Bidentate Cyclopentadienyl-Phosphine Ruthenium Complexes

Eva Becker; Kurt Mereiter; Michael Puchberger; Roland Schmid; Karl Kirchner; Angelino Doppiu; Albrecht Salzer


Archive | 2009

Method for preparation of ruthenium-indenylidene carbene catalysts

Roland Winde; Ralf Karch; Andreas Rivas-Nass; Angelino Doppiu; Gerhard Peter; Eileen Woerner


Advanced Synthesis & Catalysis | 2012

Catalytic and Structural Studies of Hoveyda–Grubbs Type Pre‐Catalysts Bearing Modified Ether Ligands

Stefano Guidone; Enguerrand Blondiaux; Cezary Samojłowicz; Łukasz Gułajski; Mariusz Kędziorek; Maura Malińska; Aleksandra Pazio; Krzysztof Woźniak; Karol Grela; Angelino Doppiu; Catherine S. J. Cazin


Archive | 2009

PROCESS FOR PREPARING DIENYL-RUTHENIUM COMPLEXES

Angelino Doppiu; Andreas Rivas-Nass; Ralf Karch; Roland Winde

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