Abstract Any catalyst should be efficient and stable to implemented in practice. This requirement is particularly valid for manganese hydrogenation catalysts. While representing a more sustainable alternative conventional noble metal-based systems, catalysts are prone degrade under catalytic conditions once operation temperatures high. Herein, we report highly Mn(I)-CNP pre-catalyst which gives rise the excellent productivity (TOF° up 41 000 h −1 ) stability (TON 200 000) catalysis. system...

Hydrogen shuttle: For the first time secondary alcohols and ammonia can be directly converted into primary amines with a selectivity of up to 99 % by using simple ruthenium/phosphine catalyst (see scheme; R1, R2= alkyl, aryl, alkenyl; M=[Ru3(CO)12]; L=phosphine ligand). Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted authors. Please note: The publisher is...

Phosphinines belong to an intriguing class of phosphorus-containing heterocycles with interesting steric, electronic and coordinating properties. This article focuses on recent developments, concepts perspectives in the field phosphinines phosphinine-based ligands their application as homogeneous catalytic reactions.

Abstract This microreview describes progress in the development and coordination chemistry of donor‐functionalized phosphinines – phosphorus analogues pyridines that has been made during last five years. The stepwise assembly 2,4,6‐triarylphosphinines starting from functionalized benzaldehyde acetophenone derivatives allows incorporation additional substituents into specific positions aromatic heterocycle. strategy can be used to synthesize chelating phosphinines, which is an essential...

Bis-N-heterocyclic carbene (NHC) aminopincer ligands were successfully applied for the first time in catalytic hydrogenation of esters. We have isolated and characterized a well-defined catalyst precursor as dimeric [Ru2(L)2Cl3]PF6 complex studied its reactivity performance. Remarkable initial activities up to 283,000 h(-1) achieved ethyl hexanoate at only 12.5 ppm Ru loading. A wide range aliphatic aromatic esters can be converted with this corresponding alcohols near quantitative yields....

The reaction of LiB(C6F5)4 with HCl in diethyl ether afforded the new oxonium acid [H(OEt2)2]+[B(C6F5)4]- (1) as a colorless crystalline solid, which was characterized by NMR spectroscopy, elemental analysis, and single-crystal X-ray diffraction. application 1 is demonstrated generation complex {[η5-C5H3(CH2CH2NMe2)CMe2-η5-C13H8]ZrCH3}+[B(C6F5)4]- (3), containing an intramolecularly donor-stabilized alkylzirconocene cation.

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAminoboratabenzene Derivatives of Zirconium: A New Class Olefin Polymerization CatalystsGuillermo C. Bazan, George Rodriguez, Arthur J. Ashe, Saleem Al-Ahmad, and Christian MüllerView Author Information Department Chemistry, University Rochester Rochester, York 14627 The Michigan Ann Arbor, 48109-1055 Cite this: Am. Chem. Soc. 1996, 118, 9, 2291–2292Publication Date (Web):March 6, 1996Publication History Received5 October 1995Published...

The Tower of London (ToL) test is widely used for measuring planning and aspects problem solving. primary focus this study was to assess the relationship among different performance measures on ToL. A secondary purpose examine putative between intelligence working memory with that ToL performance. Analyses interrelation several parameters indicated better associated longer preplanning time shorter movement execution time. Good performers showed a stronger increase in duration task difficulty...

A triptycene-based diphosphine ligand was synthesized in good yield following a new route. The corresponding Pt(II)- and Ni(0)-complexes were characterized. In butadiene hydrocyanation the tript-PPh2Ni(cod) catalyst leads to exceptionally high selectivities for linear product 3-pentenenitrile, combining activity both isomerization. This one-step procedure could be key toward process intensification.

The addition of HCN to alkenes is a very useful reaction for the synthesis functional organic substrates. Industrially nickel-catalyzed hydrocyanation has gained considerable importance mainly because production adiponitrile in DuPont process. In this process butadiene carried out using aryl phosphite-modified nickel catalyst. Since performance organo-transition metal complexes largely determined by ligand environment metal, fundamental understanding and development pivotal any progress....

Membrane filtration is an attractive approach for soluble catalyst recycling. Applications of nanofiltration have demonstrated their great potential as a method process intensification in enzyme, organo-, and homogeneous catalysis, both laboratory practice on industrial scale. Selected, recent advances recovery by means membrane are discussed, together with implication future developments. These examples demonstrate that this strategy applicable many different transformations.

Abstract This Review summarizes the state of art in transition metal‐catalyzed alkene hydrocyanation with special emphasis on mechanistic studies. Due to its importance for DuPont adiponitrile process, most literature deals nickel‐catalyzed hydrocyanation. Ligand electronic and steric effects, as well bite angle chelating ligands, play a dominant role catalyst performance. The ligand properties have major effect stability rate limiting step—the reductive elimination products. comprises three...

Catalytic reductions of carbonyl-containing compounds are highly important for the safe, sustainable, and economical production alcohols. Herein, we report on efficient transfer hydrogenation ketones catalyzed by a potent Mn(I)-NHC complex. Mn-NHC 1 is practical at metal concentrations as low 75 ppm, thus approaching loadings more conventionally reserved noble based systems. With these Mn concentrations, catalyst deactivation found to be temperature dependent becomes especially prominent...

Reaction of Ni(COD)2 with the bidentate hybrid ligand (iPr)2CH2CH2NMe2 (PN) and PhC⋮CR (R = Ph, tBu, CF3, C⋮CPh) afforded donor-stabilized mononuclear Ni(0) complexes (PN)Ni(η2-PhC⋮CR) Ph (1), tBu (4), CF3 (5)) dinuclear compound (PN)Ni(η2;η2-PhC⋮C−C⋮CPh)Ni(PN) (3), respectively. In presence excess alkyne, compounds 1, 3, 4 turned out to be active species for catalytic carbon−carbon bond activation in biphenylene formation corresponding 9,10-disubstituted phenanthrenes. However,...

The synthesis, characterization, and circular dichroism (CD) spectra of optically active mixed, neutral-charged Pt/Pt Pt/Pd macrocyclic complexes are described as well the CD their corresponding precursors. Interaction between chiral monomers (R(−)-DIOP or S(+)-DIOP) cis-Pt(DIOP)(4-ethynylpyridine)2 bistriflates (R(+)-BINAP S(−)BINAP)) Pt(II) Pd(II) bisphosphines cis-Pd(PEt3)2(OSO2CF3)2, in CH2Cl2 at room temperature results formation cyclic, molecular squares 84−99% yields via...

The hydrovinylation reaction is a codimerization of 1,3-diene or vinyl arene and ethene with great potential for fine chemicals pharmaceuticals. For the first time, enantioselective cobalt-catalyzed hydrovinylations styrene were achieved cobalt-based system bearing chiral bis(phosphine)amide ligand.

Dendrimers, specifically suited to construct site-isolated groups due their well-defined hyperbranched structure, have been used as a ligand design element for the construction of nickel catalysts ethylene oligomerization. The dendritic P,O indeed suppresses formation inactive bis(P,O)Ni complexes in toluene, is evident from NMR studies, and, consequence, outperforms parent catalysis this solvent. effect observed methanol more subtle because both 1 and 2 form bis(P,O)nickel solution...

Abstract A series of donor‐functionalized pyrylium salts have been prepared by classical condensation reactions which were further converted into the corresponding thienyl‐ and pyridyl‐substituted polydentate λ 3 ‐phosphinines reaction with P(SiMe ) . Further chemical modification these phosphorus heterocycles Hg(OAc) 2 in presence methanol resulted formation 5 ‐phosphinines. The photophysical properties a selected pyridyl‐functionalized salts, ‐ ‐phosphinines, investigated results compared...

Go with the flow: Homogeneous catalyst recycling can be applied to production of aldehydes in a continuous flow nanofiltration reactor (see picture) that operate for an unprecedented period up two weeks without showing typical deactivation or leaching phenomena. The is based on bulky, rigid, and robust silsesquioxane-modified PPh3 ligand, combines efficient recovery high activity selectivity.

A series of compounds comprising functionalized thiometallate cages [(RT)4S6] (R terminated by COO(H) or COR groups), based on adamantane (T=Ge) double-decker (T=Sn) type structures [(RSn)3S4]2- anionic defect heterocubanes were synthesized and their reactions with 1) transition-metal 2) hydrazine derivatives explored. Hence it was possible to generate ternary CuSnS CuGeS clusters transfer ligands into CR(N-NH2) CR(N-NHPh) terminal groups, respectively. The report provides the...