Mechanistic Insights into the Phosphine-Free RuCp*-Diamine-Catalyzed Hydrogenation of Aryl Ketones: Experimental and Theoretical Evidence for an Alcohol-Mediated Dihydrogen Activation
作者:Christian Hedberg、Klas Källström、Per I. Arvidsson、Peter Brandt、Pher G. Andersson
DOI:10.1021/ja051920q
日期:2005.11.1
commercially available chiral diamine quincorine-amine, originally derived from quinine, was found to be a highly active catalyst for ruthenium-catalyzed hydrogenation of ketones. The complex formed between the quincorine-amine, containing both a primary and a quinuclidine amino function, and RuCp*Cl catalyzes the hydrogenation of aromatic and aliphatic ketones in up to 90% ee approximately 24 times faster
市售的手性二胺喹可林胺,最初衍生自奎宁,被发现是钌催化酮加氢的高活性催化剂。含有伯氨基和奎宁环氨基官能团的喹可碱-胺与 RuCp*Cl 之间形成的复合物以高达 90% ee 的速度催化芳香族和脂肪族酮的氢化,比先前报道的 Ru-二胺复合物快约 24 倍。quincorine-amine的假对映体,即quincoridine-amine,也表现出很高的活性;然而,用这种催化剂获得的对映选择性较低。与喹可啉-胺相比,喹可啶-胺具有较低但相反的立体选择性的原因,可通过对反应机理的动力学和计算研究来合理化。
[EN] COMPLEXES OF IMIDAZOLE LIGANDS<br/>[FR] COMPLEXES DE LIGANDS IMIDAZOLES
申请人:AIR PROD & CHEM
公开号:WO2011156699A1
公开(公告)日:2011-12-15
Metal imidazolate complexes are described where imidazoles ligands functionalized with bulky groups and their anionic counterpart, i.e., imidazolates are described. Compounds comprising one or more such polyalkylated imidazolate anions coordinated to a metal or more than one metal, selected from the group consisting of alkali metals, transition metals, lanthanide metals, actinide metals, main group metals, including the chalcogenides, are contemplated. Alternatively, multiple different imidazole anions, in addition to other different anions, can be coordinated to metals to make new complexes. The synthesis of novel compounds and their use to form thin metal containing films is also contemplated.
Divergent Synthesis of Densely Substituted Arenes and Pyridines via Cyclotrimerization Reactions of Alkynyl Triazenes
作者:Jin-Fay Tan、Carl T. Bormann、Florian G. Perrin、F. Mark Chadwick、Kay Severin、Nicolai Cramer
DOI:10.1021/jacs.9b04111
日期:2019.7.3
aromatic triazenes can be prepared by [2 + 2 + 2] cyclotrimerization reactions of 1-alkynyl triazenes. The Cp*Ru-catalyzed cyclization proceeds well with both simple alkynyl triazenes and tethered 1-diynyl triazenes. Attractively, the methodology can be extended to pyridine synthesis by replacing an alkyne with a nitrile. The reaction is regioselective and yields the sterically more hindered product.
Coordinatively Unsaturated Ruthenium Phosphine Half-Sandwich Complexes: Correlations to Structure and Reactivity
作者:Halikhedkar Aneetha、Manuel Jiménez-Tenorio、M. Carmen Puerta、Pedro Valerga、Valentin N. Sapunov、Roland Schmid、Karl Kirchner、Kurt Mereiter
DOI:10.1021/om020359r
日期:2002.11.1
HCl to form 18e derivatives has been studied. Some model systems have been analyzed using density functional theory (DFT) calculations. Also included are comparative studies on the NN counterparts. The moieties [CpRu(PP)]+ (PP = (PH3)2, H2PCH2CH2PH2) adopt typically pyramidal structures (i.e. in the absence of bulky and rigid substituents on P) versus planar structures of [CpRu(NN)]+ (NN = (NH3)2, H2NCH2CH2NH2)
Coordinatively Unsaturated Ruthenium Complexes As Efficient Alkyne–Azide Cycloaddition Catalysts
作者:Marina Lamberti、George C. Fortman、Albert Poater、Julie Broggi、Alexandra M. Z. Slawin、Luigi Cavallo、Steven P. Nolan
DOI:10.1021/om2012425
日期:2012.1.23
16-electron rutheniumcomplexes with the general formula Cp*Ru(L)X (in which L = phosphine or N-heterocycliccarbene ligand; X = Cl or OCH2CF3) was explored in azide–alkyne cycloaddition reactions that afford the 1,2,3-triazole products. The scope of the Cp*Ru(PiPr3)Cl precatalyst was investigated for terminal alkynes leading to new 1,5-disubstituted 1,2,3-triazoles in high yields. Mechanisticstudies were