Facile Synthesis of Effcient and Selective Ruthenium Olefin Metathesis Catalysts with Sulfonate and Phosphate Ligands

A series of novel, air-stable ruthenium NHC catalysts with sulfonate and phosphate anions have been prepared easily in one pot at high yields using commercially available precursors. The catalysts were found to be effective for ring-opening metathesis polymerization, ring-closing metathesis, and cross-metathesis. The catalysts showed higher cis-selectivity in olefin cross-metathesis reactions as compared to earlier known ruthenium-based olefin metathesis catalysts, with allylbenzene and cis-1,4-diacetoxybutene as substrates

Efficient and Highly Aldehyde Selective Wacker Oxidation

A method for efficient and aldehyde-selective Wacker oxidation of aryl-substituted olefins using PdCl_2(MeCN)_2, 1,4-benzoquinone, and t-BuOH in air is described. Up to a 96% yield of aldehyde can be obtained, and up to 99% selectivity can be achieved with styrene-related substrates

Primary Alcohols from Terminal Olefins: Formal Anti-Markovnikov Hydration via Triple Relay Catalysis

Alcohol synthesis is critical to the chemical and pharmaceutical industries. The addition of water across olefins to form primary alcohols (anti-Markovnikov olefin hydration) would be a broadly useful reaction but has largely proven elusive; an indirect hydroboration/oxidation sequence requiring stoichiometric borane and oxidant is currently the most practical methodology. Here, we report a more direct approach with the use of a triple relay catalysis system that couples palladium-catalyzed oxidation, acid-catalyzed hydrolysis, and ruthenium-catalyzed reduction cycles. Aryl-substituted terminal olefins are converted to primary alcohols by net reaction with water in good yield and excellent regioselectivity

Supramolecular assembly using geometrically-defined metals and topologically-directed Pyridyl Carboxylates

Ph.DDOCTOR OF PHILOSOPH

Spacer directed metallo-supramolecular assemblies of pyridine carboxylates

N,O-donating spacers are members of a class of ambidentate donors used in supramolecular self-assemblies. The skeletal adaptability and coordination flexibility of these ligands enable them to support a myriad of discrete molecular systems and extended network materials. This review focuses on pyridinecarboxylates as a representative of N,O-hetero-donating spacers and describes their recent developments in the coordination assemblies and highlights their functions and potential applications

Formal Intermolecular Hydroamination of Unbiased Olefins for Primary Amine Formation

A Pd/Ir dual metal tandem catalyst system was found to be active in catalyzing the one-pot, two-step formal hydroamination of unbiased olefins such as 1-dodecene with an ammonia source to give branched primary amines in high yields of >85 % by using only 1 mol-% of the Ir catalyst. This is the first report of the formal one-pot intermolecular hydroamination of olefins to obtain primary amines.ASTAR (Agency for Sci., Tech. and Research, S’pore)Accepted versio

Formal hydration of non-activated terminal olefins using tandem catalysts

The hydration of terminal olefins to secondary alcohols has been achieved using a Pd(II)/Ru(II) catalyst combination with high regioselectivity and yields. Both vinyl arenes and aliphatic olefins can be hydrated easily with the tandem catalyst system using a low catalyst loading of 1 mol%.ASTAR (Agency for Sci., Tech. and Research, S’pore)Accepted versio

Efficient and Highly Aldehyde Selective Wacker Oxidation

A method for efficient and aldehyde-selective Wacker oxidation of aryl-substituted olefins using PdCl₂(MeCN)₂, 1,4-benzoquinone, and <i>t</i>-BuOH in air is described. Up to a 96% yield of aldehyde can be obtained, and up to 99% selectivity can be achieved with styrene-related substrates

Isolation of cationic digold-frame with free carboxylic acid pendants

10.1039/b823028eDalton Transactions255009-501

Na+ and Ca2+ ion selective pyridylcarboxylate rings of Pd(II) and Pt(II)

10.1039/b821379hDalton Transactions295637-564