Author: Petr ŠTěpnička

Synthesis and Catalytic Use of Polar Phosphinoferrocene Amidosulfonates Bearing Bulky Substituents at the Ferrocene Backbone

2021

International audience; Anionic phosphinoferrocene amidosulfonates bearing sterically demanding t-butyl substituents in positions 3 and 3' of the ferrocene scaffold, viz. rac-(Et3NH)[Fe(η5-tBuC5H3PR2)(η5-tBuC5H3C(O)NHCH2SO3)] (R = phenyl and cyclohexyl) were synthesized by amidation of the corresponding phosphinocarboxylic acids, [Fe(η5-tBuC5H3PR2)(η5-tBuC5H3CO2H)]. These ditopic polar phosphinoferrocenes and their non-t-butylated analogues have been used as lig-ands to prepare zwitterionic (η3-allyl)palladium(II) complexes [Pd(η3-C3H5){Fe(η5-R'C5H3PR2)(η5-R'C5H3C(O)NHCH2SO3)}] (R' = H, tBu, R = Ph, Cy). Depending on the isolation procedure and crystallization condi-tions, some complexes we…

Bearing (mechanical)010405 organic chemistryChemistry[CHIM.ORGA]Chemical Sciences/Organic chemistryOrganic Chemistry[CHIM.CATA]Chemical Sciences/Catalysis010402 general chemistry01 natural sciences0104 chemical sciencesCatalysislaw.inventionInorganic Chemistrychemistry.chemical_compoundFerrocenelawPolymer chemistryPolar[CHIM.COOR]Chemical Sciences/Coordination chemistryPhysical and Theoretical Chemistry

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Syntheses and properties of some exo,exo-bis(isodicyclopentadienyl)titanium low-valent complexes

2002

Abstract The paramagnetic compounds exo,exo-bis(η5-isodicyclopentadienyl)chlorotitanium(III) (3) and its analogue with trimethylsilyl-substituted isodicyclopentadienide (isodiCp) ligand (4), and the similar pair of diamagnetic exo,exo-bis(isodicyclopentadienyl)[η2-bis(trimethylsilyl)ethyne]titanium(II) complexes 5 and 6 were obtained by common reduction procedures from exo,exo-bis(isodicyclopentadienyl)titanium(IV) dichloride (1) and exo,exo-bis[η5-2-(trimethylsilyl)isodicyclopentadienyl]titanium(IV) dichloride (2), respectively. As indicated by ESR spectroscopy compound 3 is a dimer in the solid state and in frozen toluene glass but monomeric in toluene solution. Compound 4 is monomeric in…

TrimethylsilylStereochemistryLigandDimerOrganic Chemistrychemistry.chemical_elementCrystal structureBiochemistryTolueneMedicinal chemistryInorganic ChemistryNMR spectra databasechemistry.chemical_compoundMonomerchemistryMaterials ChemistryPhysical and Theoretical ChemistryTitaniumJournal of Organometallic Chemistry

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Highly Functionalized Brønsted Acidic/Lewis Basic Hybrid Ferrocene Ligands: Synthesis and Coordination Chemistry

2019

International audience; A general challenging issue in the synthesis of hemilabile ferrocene ligands is the access to highly functionalized ferrocene starting materials. These can bear donor/acceptor atoms, additional functional and structuring spectator substituents, but the preparation of such species poses general synthetic difficulties. We report herein alternative synthetic routes to hybrid ferrocene donors such as tert-butylated phosphanylcarboxylic acids and their corresponding aldehydes. These hybrid ambiphilic species that combine Brønsted-acidic and Lewis-basic functional moieties in their structure were characterized by multinuclear NMR and single-crystal X-ray diffraction analys…

chemistry.chemical_classification010405 organic chemistryHydrogen bondSolid-state010402 general chemistry01 natural sciencesCombinatorial chemistryAcceptor0104 chemical sciencesCoordination complexInorganic Chemistrychemistry.chemical_compoundFerrocenechemistry[CHIM.COOR]Chemical Sciences/Coordination chemistryBrønsted–Lowry acid–base theoryMutual influence

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