The present invention relates to an oligomerization catalyst including a transition metal or transition metal precursor, a halogen-substituted organic ligand, and a heteroatom ligand, and to a method for selectively preparing 1-hexene or 1-octene from ethylene using the catalyst.

It is an object of the present invention to provide a method for producing a terminal-modified polybutadiene or terminal-modified hydrogenated polybutadiene that does not become colored or white and turbid, without using an organotin compound. The production method of the present invention includes reacting an acrylate or methacrylate represented by formula (I), a diisocyanate compound represented by formula (II), and a polybutadiene or hydrogenated polybutadiene having a hydroxyl group at a polymer terminal, represented by formula (III), in the presence of at least one selected from an organoaluminum compound and an organozinc compound (with the proviso that zinc naphthenate is excluded). ##STR00001##

The invention provides a molecular transition metal complex selected from Formula 1, as described herein; an ethylene-based polymer; and a process to form the ethylene-based polymer, said process comprising polymerizing ethylene in the presence of at least one molecular transition metal complex selected from Formula 1, as described herein, and wherein either Z.sub.1 or Z.sub.2 is dative covalent (coordinate) to the metal (M).

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The current invention describes new metathesis catalysts, a method for their preparation and their use in metathesis reactions.

A process for producing isomerized olefins, branched aldehydes, branched alcohols, branched surfactants and other branched derivatives through isomerization, hydroformylation, hydrogenation, surfactant forming reactions and other derivative forming reactions.

The present invention relates to the technical field of chiral synthesis, and specifically provides the synthesis and use of a new type of oxa-spirodiphosphine ligands. The bisphosphine ligand is prepared with oxa-spirobisphenol as a starting material after triflation, palladium catalyzed coupling with diaryl phosphine oxide, reduction of trichlorosilane, further palladium catalyzed coupling with diaryl phosphine oxide, and further reduction of trichlorosilane. The oxa-spiro compound has central chirality, and thus includes L-oxa-spirodiphosphine ligand and R-oxa-spirodiphosphine ligand. The racemic spirodiphosphine ligand is capable of being synthesized from racemic oxa-spirobisphenol as a raw material. The present invention can be used as a chiral ligand in the asymmetric hydrogenation of unsaturated carboxylic acids. The complex of the ligand with ruthenium can achieve an enantioselectivity of greater than 99% in the asymmetric hydrogenation of methyl-cinnamic acid.

The invention relates to a process for oligomerization of ethylene, preferably for selective trimerization of ethylene to hex-1-ene, comprising simultaneously bringing ethylene into contact with the components of a catalytic composition based on chromium.

This invention relates to a Cu-BTC MOF which is water stable. The Cu-BTC MOF has been modified by substituting some of the BTC ligand (1,3,5, benzene tricarboxylic acid) with 5-aminoisophthalic acid (AIA). The resultant MOF retains at least 40% of its as synthesized surface area after exposure to liquid water at 60° C. for 6 hours. This is an unexpected result versus the MOF containing only the BTC ligand. This MOF can be used to abate contaminants such as ammonia in gas streams and especially air streams.

The present disclosure relates to a method for regenerating a waste organic zinc catalyst by performing surface modification using a dicarboxylic acid and a zinc compound. When using the method for regenerating an organic zinc catalyst according to the present disclosure, the organic zinc catalyst can be regenerated using a convenient method which modifies the dicarboxylic acid and the zinc compound in an alternately repeated manner.

This present invention relates to a catalyst composition for a production process of δ-lactone from carbon dioxide and 1,3-butadiene that can efficiently catalyze the synthesis reaction of δ-lactone with good selectivity of δ-lactone, wherein said catalyst composition comprising: a) palladium metal complexes as shown in structure (I) [Formula should be inserted here] wherein, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently represents a group selected from a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an amine group, or optionally an alkenyl group, an alkynyl group, a phenyl group, a benzyl group, or a cyclic hydrocarbon group comprising a hetero atom; and b) phosphorus compound selected from a phosphine group having a general formula [Formula should be inserted here], wherein R.sup.5 is selected from an alkyl group, a cycloalkyl group, or an aryl group. ##STR00001##