ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew ruthenium vinylidene complexes as intermediates for the access to .sigma.-acetylide and unsymmetrical trans-diynyl, alkynyl metal complexes. Crystal structures of [(Ph2PCH2PPh2)2(Cl)Ru=C=CH2]PF6 [(Ph2PCH2PPh2)2(Cl)RuC.tplbond.CH] complexesDaniel Touchard, Pierre Haquette, Nadine Pirio, Loic Toupet, H. DixneufCite this: Organometallics 1993, 12, 8, 3132–3139Publication Date (Print):August 1, 1993Publication History Published online1 May...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Di- and Mono- Substituted Allenylidene-Ruthenium [(Ph2PCH2PPh2)2ClRu:C:C:C(Y)R]PF6 Acetylide Complexes by Activation Prop-2-yn-1-olsDaniel Touchard, Nadine Pirio, Pierre H. DixneufCite this: Organometallics 1995, 14, 10, 4920–4928Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1 October...

Herein, we report on (31)P(31)P solution-phase "through-space" nuclear spin-spin coupling constants (J(PP)) from a novel family of organometallic tetraphosphine nickel and palladium complexes. These J(PP) were accurately determined through NMR iterative simulation based the second-order spectra obtained for compounds. The corresponding solid-state X-ray structures complexes determined, P.P distances are reported. Due to blocked conformation species in solution, qualitative semiquantitative...

The activation with cis-RuCl2(Ph2PCH2PPh2)21 of HCC–CR2OH and HCC–C(Me)CH2 leads to allenylidenes trans-(Cl)Ru+CCCR2(Ph2PCH2PPh2)2(R = Ph, Me, p-Cl-Ph) that HCC–CC–CPh2OSiMe3 affords a new allenylidene–ruthenium complex 9via an intramolecular ortho C–H bond addition.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetallacumulenes: Activation of Diynes and Formation New Allenylideneruthenium Complexes. Crystal Structures trans-[(Ph2PCH2PPh2)2(Cl)Ru:C:C:CR1R2]+ trans-[(Ph2PCH2PPh2)2Ru(:C:C:C(OMe)CH:CPh2)2]2+ DerivativesDaniel Touchard, Nadine Pirio, Loiec Toupet, Mohammed Fettouhi, Lahcene Ouahab, Pierre H. DixneufCite this: Organometallics 1995, 14, 11, 5263–5272Publication Date (Print):November 1, 1995Publication History Published online1 May 2002Published...

Abstract A method that allows hindered ortho ‐substituted aryl iodides to be efficiently coupled phenylboronic acid using a gold‐catalyzed C−C bond formation is presented. The use of molecularly‐defined dinuclear gold chloride catalytic precursor stabilized by new tetradentate ( N , N′ )‐diamino‐( P,P′ )‐diphosphino ferrocene hybrid ligand in Suzuki‐type reaction described for the first time. Electron‐rich isopropyl groups on phosphorus were found essential superior activity, while...

The tricyclic zirconium complex 2 is formed when transient zirconocene–benzyne allowed to react with bis(alkynyl)phosphane 1. Further reactions lead mono- and 1,2-dihydrophosphetes.

Two trans diynyl ligands are found in ruthenium complex 1, which is prepared from cis-[RuCl2(dppm)2] (dppm = bis(diphenylphosphino)methane) and the appropriate organotin compound accompanied by elimination of Bu3SnCl. Complex 1 treated with HBF4 · Et2O methanol to form salt 2, contains first-ever bis(allenylidene)metal unit its dication. This type especially interesting view unusual physical properties anticipated for it. \documentclass{article}\pagestyle{empty}\begin{document}$\widehat{\rm...

The reactions of a C,N-chelated ((LCN)2M, where LCN is 2-((dimethylamino)methyl)phenyl and M Sn (1) or Pb (2)) stannylene plumbylene with di-n-butylbis(η5-cyclopentadienyl)zirconium (3) were studied. In the case stannylene, trinuclear carbene-like complex [(LCN)2Sn]2Cp2Zr (4) was isolated as major product. second product resulted from transmetalation C,N-chelating ligand tin to zirconium, followed by 1-butene coupling coordinated aryne (C,N-chelating ligand) (5). lead case, 5. Byproducts...

In the interaction between grapevines and Botrytis cinerea, one of main aspects pathogenicity is fungal ability to degrade phytoalexins synthesized by plant in response infection. Laccase-like stilbene oxidase activity liquid cultures B. cinerea has been shown be related decrease phytoalexin concentrations. Recent research results presented this paper determined chemical structure a pterostilbene metabolite produced cinerea. Study degradation that just free hydroxy phenyl group function...

Y. Miquel, A. Igau, B. Donnadieu, J.-P. Majoral, L. Dupuis, N. Pirio and P. Meunier, Chem. Commun., 1997, 279 DOI: 10.1039/A606672K

The activation of alkynes HCCR with cis-[RuCl2(Ph2PCH2PPh2)2]1 leads to vinylidenes trans-[(Ph2PCH2PPh2)2(Cl)Ru+CCHR], even directly from acetylene itself (R = H) or prop-2-ynyl alcohol, which the Ru+CCH(CH2OH) moiety is resistant dehydration, and deprotonation 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) affords trans-[(Ph2PCH2PPh2)2(Cl)Ru–CC–R] derivatives.

Thermal decomposition of Cp2ZrPh2 in the presence buta-1,3-diynes RC≡CC≡CR (R = Ph, SiMe3) can lead to seven- or five-membered metallacycles. In both cases a stable benzo-fused seven-membered zirconacyclocumulene arising from 2-fold insertion triple bonds dialkyne situ generated zirconocene benzyne is formed. case Me3SiC≡CC≡CSiMe3 second minor complex isolated: 3-alkynyl-substituted zirconaindene β monoinsertion one acetylenic function conjugated diyne benzyne. No 2-alkynyl-substituted...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTZirconocene-ate Zwitterionic Complexes: Preparation and X-ray StructureYannick Miquel, Alain Igau, Bruno Donnadieu, Jean-Pierre Majoral, Nadine Pirio, Philippe MeunierView Author Information Laboratoire de Chimie Coordination, CNRS 205, route Narbonne, 31077 Toulouse Cedex, France Synthèse et d'Electrosynthèse Organométalliques associé au (LSEO UMR 5632) Université Bourgogne, Faculté des Sciences Gabriel 6 Boulevard Gabriel, 21000 Dijon, Cite...

A variety of aminomethyl-substituted ferrocenes and the parent compounds (iminomethyl)ferrocenes, azaferrocenophanes, diferrocenylamines can be selectively synthesized from reductive amination 1,1′-diformylferrocene or formylferrocene. The optimized one- two-step reactions have delivered 13 new compounds, isolated in 65–97% yields, which include tertiary (ferrocenylmethyl)amines azaferrocenophanes by using NaBH(OAc)3 as a mild reducing agent (iminomethyl)ferrocenes secondary LiAlH4. X-ray...

Abstract Di‐ tert ‐butylated‐bis(phosphino)ferrocene ligands bearing phosphino substituents R ( R=phenyl, cyclohexyl, iso‐propyl, mesityl, or furyl ) allow tuning the selective formation of Au(I) halide complexes. Thus, dinuclear linear two‐coordinate, but also rare mononuclear trigonal three‐coordinate and tetrahedral four‐coordinate complexes were formed upon conditions. Both chloride rarer iodide synthesized, their X‐ray diffraction analysis are reported. The significance control...

The first annelated bis- and mono-3H-1,3-azaphosphole ferrocene sandwich compounds have been synthesized from aminoferrocenes, their X-ray structures are compared to those of selenide-protected P═Se analogues, showing net discrepancies both in metallocene backbone conformation fused-ring planarity.

Ferrocene is unique among organometallic compounds, and serves notably as a versatile platform towards the production of ligands useful to promote transition metals chemistry. A general limiting aspect synthesis ferrocene derivatives efficient access sophisticated highly functionalized polysubstituted ferrocenes, i.e. bearing four or more substituents replacing hydrogen atoms on cyclopentadienyl rings. These can bear various functional or/and structuring spectator substituents. Their...

Hexasubstituted hybrid tetradentate (N,N′,P,P′)-ferrocenes bearing phosphino and aminomethyl groups, plus hindering tert-butyl moieties, were synthesized by using two different strategies: a "diverging" synthesis involving successive functionalization of preformed di-tert-butylated ferrocene "converging" assembly the species from appropriately substituted cyclopentadienyl rings. While new salts formed are interest, their with iron dichloride used as way to produce ligands presented several...