An organic reductant, in particular an organo silicon reductant suitable for activating supported catalysts of the type MO.sub.nE.sub.m, wherein E is S and/or Se, in particular MO.sub.n, wherein M is W, Mo or Re, is described as well as its use in metathesis reactions. The reduced catalysts are able to metathesize olefins at low temperatures and are therefore also suitable for metathesis of functionalized olefins.

The present invention concerns a method for the hydrosilylation of an unsaturated compound comprising at least one ketone function, one aldehyde function, one alkene function and/or one alkyne function, with a compound comprising at least one hydrogen-silyl function implementing an organic catalyst of tri-coordinated germanium.

Novel catalytic compositions are disclosed comprising novel unsymmetrical metallocene catalytic compounds. Also disclosed are uses of such catalytic compositions in olefin polymerisation reactions, as well as processes of polymerising olefins. When compared with the prior art compositions, the catalytic compositions of the invention are markedly more active in the polymerisation of olefins.

Provided herein are methods of catalytic hydrosilylation, including triggerable methods, using metal-ligand complexes as catalysts, characterized by formula ML.sub.xD.sub.y; wherein: M is a metal; x is equal to the oxidation state of M; each D is independently a neutral coordinating ligand; y is zero or an integer selected from the range of 1 to 4; and each L is independently a mono-anionic ligand. L may be a η.sup.1,η.sup.2-β,β-disubstituted-ω-alkenyl ligand.

Provided is a mononuclear ruthenium complex that comprises a ruthenium-silicon bond that is represented by formula (1) and that exhibits excellent catalyst activity in each of a hydrosilylation reaction, a hydrogenation reaction, and reduction of a carbonyl compound. ##STR00001## In formula (1), R.sup.1-R.sup.6 either independently represent an alkyl group, an aryl group, an aralkyl group or the like that may be substituted with a hydrogen atom or X, or represent a crosslinking substituent in which at least one pair comprising one of R.sup.1-R.sup.3 and one of R.sup.4-R.sup.6 is combined. X represents a halogen atom, an organoxy group, or the like. L represents a two-electron ligand other than CO and phosphine. When a plurality of L are present, the plurality of L may be the same as or different from each other. When two L are present, the two L may be bonded to each other. n and m independently represent an integer of 1 to 3 with the stipulation that n+m equals 3 or 4.

The present invention relates to a novel metallocene compound, a catalyst composition including the same, and a method of preparing an olefinic polymer by using the same. The metallocene compound according to the present invention and the catalyst composition comprising the same can be used for producing olefinic polymers, have outstanding polymerizing ability, and can produce olefinic polymers of ultra high molecular weight. In particular, when the metallocene compound according to the present invention is employed, an olefinic polymer of ultra high molecular weight can be obtained because it shows high polymerization activity even when it is supported on a carrier and maintains high activity even in the presence of hydrogen because of its low hydrogen reactivity.

This invention relates to molecular catalysts and chemical reactions utilizing the same, and particularly to catalysts and catalytic methods for reduction of molecular nitrogen. The molecular catalytic platform provided herein is capable of the facile reduction of molecular nitrogen under useful conditions such as room temperature or less and atmospheric pressure or less.

Silica-coated alumina activator-supports, and catalyst compositions containing these activator-supports, are disclosed. Methods also are provided for preparing silica-coated alumina activator-supports, for preparing catalyst compositions, and for using the catalyst compositions to polymerize olefins.

Novel compositions and systems for closure of wounds are disclosed. The compositions provide devices of improved flexibility and elasticity and are readily applied to wound sites or over wound closure devices. The present invention is also directed to a novel platinum catalyst for use in such compositions. The catalyst provides for rapid curing on topical surfaces such as skin and bonds to such surfaces in about 2-5 minutes.

Novel compositions and systems for closure of wounds with antimicrobial effectiveness are disclosed. The compositions provide devices of improved flexibility and elasticity and are readily applied to wound sites or over wound closure devices. The present invention is also directed to a novel platinum catalyst for use in such compositions. The catalyst provides for rapid curing on topical surfaces such as skin and bonds to such surfaces in about 2-5 minutes.