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Kay Severin

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Publications associées (216)

Synthesis of borasiloxane-based macrocycles by multicomponent condensation reactions in solution or in a ball mill

Kay Severin, Rosario Scopelliti, Mirela Pascu, Albert Ruggi

Large macrocycles containing imine and borasiloxane links are obtained in polycondensation reactions of 4-formylbenzeneboronic acid, t-Bu2Si(OH)2, and diamines. The multicomponent reactions can be performed in solution or – advantageously – by mechanochemi ...

Royal Soc Chemistry2013

Activation of Nitrous Oxide by Dinuclear Ruthenium Complexes

Kay Severin, Rosario Scopelliti, Euro Solari, Alexander Tskhovrebov

The dinuclear Ru(II) complexes (arene)Ru(μ-Cl)3RuCl(C2H4)(PCy3) (arene = p-cymene or 1,3,5-C6H3iPr3) react with N2O under mild conditions to give OPCy3 and the trinuclear complexes (arene)Ru(μ-Cl)3Ru(μ-Cl)3Ru(arene). The N-heterocyclic carbene complex (p-c ...

American Chemical Society2012

Ruthenium-catalyzed Atom Transfer Radical Addition Reactions

Kay Severin

Certain ruthenium complexes are potent catalysts for atom transfer radical addition (ATRA) and cyclization (ATRC) reactions, in particular if they are used in conjunction with reducing agents such as magnesium. This short overview summarizes recent develop ...

2012

Ruthenium-Catalyzed Sequential Enyne Cross-Metathesis/ATRA Reactions

Kay Severin, Euro Solari, Jesus Ruiz, Gregor Kiefer

Sequential enyne cross-metathesis reactions of arylalkynes with ethylene followed by atom transfer radical addition (ATRA) with ethyl dichloroacetate or dichloroacetonitrile provide 1,5-dichloropent-2-ene derivatives. The second-generation Grubbs alkyliden ...

Wiley-Blackwell2012

Dicarboxylate-Bridged Ruthenium Complexes as Building Blocks for Molecular Nanostructures

Kay Severin, Rosario Scopelliti, Benan Kilbas

Ruthenium complexes with bridging dicarboxylate ligands were combined with 1,2-di-4-pyridylethylene (dpe), 2,4,6-tri-4-pyridyltriazine (4-tpt), or 2,4,6-tri-3-pyridyltriazine (3-tpt) to give a tetranuclear rectangle or hexanuclear coordination cages. The c ...

2012

Supramolecular polymers based on dative boron–nitrogen bonds

Kay Severin, Nicolas Luisier, Erin Sheepwash

Heteroditopic monomers containing an arylboronate ester and a dialkyl-4-aminopyridine group aggregate via dative boron–nitrogen bonds to give main chain supramolecular polymers. The degree of polymerization can be tuned by changing the electronic and steri ...

Royal Society of Chemistry2012

A ratiometric fluorescence sensor for caffeine

Kay Severin, Anne-Clémence Corminboeuf, Nicolas Luisier, Nicolas David Gaeng, Laurane Favre, Albert Ruggi

The dye disodium 3,4:3’,4’-bibenzo[b]thiophene-2,2’-disulfonate can be used as molecular probe for the fluorimetric detection of caffeine in aqueous solution. The fluorescence response is attributed to non-covalent interactions of caffeine with the dye in ...

Royal Society of Chemistry2012

RhCl3-Mediated Coupling Reactions of tert-Butyl Acetylene

Kay Severin, Rosario Scopelliti, Euro Solari, Barnali Dutta, Gregor Kiefer

RhCl3 is shown to mediate unusual coupling reactions of tert-butyl acetylene. When RhCl3(H2O)n was heated with four equivalents of tert-butyl acetylene in methanol, the dinuclear complex [{Rh(μ-Cl)(CH2tBu)(tBuC=CHCOCH2tBu)}2] (2) was isolated. A larger exc ...

Wiley-Blackwell2012

Borophosphonate Cages: Easily Accessible and Constitutionally Dynamic Heterocubane Scaffolds

Kay Severin, Rosario Scopelliti, Konstantin Zhurov, Laure Menin, Justus Tönnemann

A versatile and experimentally facile procedure for the synthesis of borophosphonate cages of the general formula [tBuPO3BR′]4 is described. The method involves heating of tert-butylphosphonic acid with a boronic acid in toluene to give borophosphonates in ...

Wiley-V C H Verlag Gmbh2012

A solvent-responsive coordination cage

Kay Severin, Rosario Scopelliti, Benan Kilbas

The solvent-induced structural rearrangement of synthetic supramolecular structures typically requires a pronounced change in solvent polarity. We describe a ruthenium-based coordination cage, whose geometry and topology can be altered dramatically by usin ...

2012

Sequential N–O and N–N Bond Cleavage of N-Heterocyclic Carbene-Activated Nitrous Oxide with a Vanadium Complex

Kay Severin, Rosario Scopelliti, Euro Solari, Matthew Wodrich, Alexander Tskhovrebov

Chemically induced bond cleavage of nitrous oxide typically proceeds by rupture of the N–O bond with concomitant O-atom transfer and liberation of dinitrogen. On a few occasions, N–N bond scission has been observed instead. We report a reaction sequence in ...

2012

Covalent Capture of Nitrous Oxide by N-Heterocyclic Carbenes

Kay Severin, Rosario Scopelliti, Euro Solari, Matthew Wodrich, Alexander Tskhovrebov

A good catch: N-heterocyclic carbenes (NHCs) form stable adducts with nitrous oxide (N2O) under mild reaction conditions. The adducts display unique reactivity as evidenced by an alkylation reaction which leads to a rupture of the NN bond. ...

Wiley-Blackwell2012

Fluorescence sensing of spermine with a frustrated amphiphile

Kay Severin, Ziya Köstereli

A charge-frustrated amphiphile composed of a pyrene-1,3,6-trisulfonate head group and an eicosane side chain can be used as a fluorescence chemosensor for spermine. The sensor allows the detection of spermine down to the nanomolar concentration range with ...

Royal Society of Chemistry2012

Fluorescence sensing of caffeine in water with polysulfonated pyrenes

Kay Severin, Sébastien Rochat, Anne-Clémence Corminboeuf

The commercially available fluorescence dye 8-hydroxypyrene-1,3,6-trisulfonate (HPTS) can be used as a selective molecular probe for the detection of caffeine in aqueous solution. ...

Royal Society of Chemistry2011

Modulating the Steric, Electronic, and Catalytic Properties of Cp* Ruthenium Half-Sandwich Complexes with β-Diketiminato Ligands

Kay Severin, Rosario Scopelliti, Paul Joseph Dyson, Dominique Schreiber, Katrin Anne Thommes, Andrew Douglas Phillips

Five different types of β-diketiminate ligands, bearing electron-donating to strongly electron-withdrawing substituents, were synthesized and used in the synthesis of Cp* ruthenium complexes (Cp* = η5-C5Me5). One series consists of complexes with a covalen ...

American Chemical Society2011

Constitutionally selective amplification of multicomponent 84-membered macrocyclic hosts for (−)-cytidine•H+

Kay Severin

Mixtures of dipeptide monomers create stereochemically and constitutionally complex dynamic libraries of potential receptors. When (−)-cytidine was utilized as guest an 84-membered cyclic host was amplified (70–175 fold) from a nearly undetectable initial ...

2011

Ruthenium-Catalyzed Synthesis of 1,5-Dichlorides by Sequential Intermolecular Kharasch Reactions

Kay Severin, Rosario Scopelliti, Aurélien Godinat, Katrin Anne Thommes, Charlotte Buron

Sequential intermolecular atom transfer radical addition reactions of activated dichlorides Cl2CRR′ (R = CN, CO2Et, R′ = H, CN, CO2Et) with two olefins catalyzed by [Cp*RuCl2(PPh3)] in the presence Mg allow the synthesis of linear 1,5-dichlorides. Differen ...

Wiley-Blackwell2011

Sequential ATRA-Reductive Cyclopropanation Reactions with a Ruthenium Catalyst in the Presence of Manganese

Kay Severin, Charlotte Buron

Atom-transfer radical addition (ATRA) reactions of ethyl trichloroacetate, dichloromalononitrile, or diethyl 2,2-dichloromalonate with olefins followed by dechlorination have provided functionalized cyclopropanes in one step. The RuIII complex [Cp*RuCl2(PP ...

Wiley-Blackwell2011

Molecular Networks Based on Dative Boron-Nitrogen Bonds

Kay Severin, Rosario Scopelliti, Vincent Krampl, Erin Sheepwash, Antonia Neels, Olha Sereda

The BN connection: Crystalline and soft molecular networks can be constructed using dative BN bonds (see picture). The networks are obtained in a one-step, three-component reaction involving a triboronic acid, a catechol, and a bipyridyl linker. ...

Wiley-VCH Verlag GmbH2011

A simple fluorescence assay for the detection of fluoride in water at neutral pH

Kay Severin, Sébastien Rochat

A simple assay for the detection of fluoride in water by fluorescence spectroscopy was developed. The assay is based on commercially available reagents and allows sensing of fluoride in the low millimolar concentration range with high selectivity over othe ...

Royal Society of Chemistry2011

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