Abstract:
Disclosed are aromatic spiroketal diphosphine ligands, preparation methods and uses thereof. The ligands have the structure of formula (I), in which R1, R2, R3, R4, R5, R6, R7, R8, X and n are defined as such described in the specification. The aromatic spiroketal diphosphine ligands are prepared from aromatic spiroketal compounds. Also disclosed are the preparation methods of aromatic spiroketal compounds. The preparation methods are simple and can produce racemic or chiral aromatic spiroketal diphosphine ligands. The ligands can be used as catalysts of asymmetrical catalytic reactions having economical practicability and industry application prospect
Abstract:
The invention describes a novel type of nickel-based complex and its preparation method. The invention also concerns the use of said complex in a process for the transformation of olefins.
Abstract:
A composition is capable of curing via condensation reaction. The composition uses a new condensation reaction catalyst. The new condensation reaction catalyst is used to replace conventional tin catalysts. The composition can react to form a gum, gel, rubber, or resin.
Abstract:
Catalyst structures comprising a single palladium metal center and a substituted tri-arylphosphine ligand. Also disclosed are methods of making and using the catalyst structures to facilitate polymerization reactions and Heck coupling reactions.
Abstract:
Catalyst structures comprising a single palladium metal center and a substituted tri-arylphosphine ligand. Also disclosed are methods of making and using the catalyst structures to facilitate polymerization reactions and Heck coupling reactions.
Abstract:
There is disclosed a catalyst composition prepared by reacting together: (a) a source of a Group VIII metal, (b) a compound of the formula (I) R.sup.1 R.sup.2 PR.sup.4 CO.sub.2 R.sup.3 (I) where R.sup.1 and R.sup.2 are independently an unsubstituted or substituted alkyl, cycloalkyl or aryl group, R.sup.3 is hydrogen, an unsubstituted or substituted alkyl, cycloalkyl or aryl group and R.sup.4 is a divalent organic group and (c) a source of an anion which is either non-coordinating or weakly-coordinating to the Group VIII metal. The catalyst compositions are used in the preparation of polyketones from carbon monoxide and one or more olefins. Novel compounds of the formula �(.eta..sup.3 -allyl)Pd(R.sub.1 R.sup.2 PR.sup.4 CO.sub.2 R.sup.3)!A where A is a weakly or non-coordinating anion are useful as such catalysts.
Abstract:
There is disclosed a catalyst composition prepared by reacting together:(a) a source of a Group VIII metal,(b) a compound of the formula (I)R.sup.1 R.sup.2 PR.sup.4 CO.sub.2 R.sup.3 (I) where R.sup.1 and R.sup.2 are independently an unsubstituted or substituted alkyl, cycloalkyl or aryl group, R.sup.3 is hydrogen, an unsubstituted or substituted alkyl, cycloalkyl or aryl group and R.sup.4 is a divalent organic group and(c) a source of an anion which is either non-coordinating or weakly-coordinating to the Group VIII metal.The catalyst compositions are used in the preparation of polyketones from carbon monoxide and one or more olefins. Novel compounds of the formula [(.eta..sup.3 -allyl)Pd(R.sup.1 R.sup.2 PR.sup.4 CO.sub.2 R.sup.3)]Y where Y is a weakly or non-coordinating anion are useful as such catalysts.
Abstract:
Ethylene is oligomerized to even numbered alpha-monoolefins principally in the C.sub.4 to C.sub.40 range with minimal concomittant production of high molecular weight polyethylene by reacting ethylene in a diol solvent in an oligomerization reaction zone at elevated pressure with a nickel complex catalyst composition produced by combining in the reaction zone, (a) a stable preformed complex of nickel, ethylene and hydride in a diol solvent, said complex being prepared by contactng in a diol solvent and in the presence of ethylene, a nickel salt, a base and a boron hydride transfer agent and (b) a suitable bidentate ligand; the stable nickel complex solution and the bidentate ligand being added in separate portions to the reaction zone. These stable complexes of nickel, ethylene and hydride in diol solution are considered to be novel oligomerization catalyst precursor compositions.
Abstract:
A new group of nickel ylides is provided that is highly active at relatively low operating temperatures and pressures in the oligomerization of ethylene. The compounds can be defined by the following Formula I: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 are either alike or different members selected from the group consisting of hydrogen, alkyl radicals having from about one to about 24 carbon atoms, preferably from about one to about 10 carbon atoms; aryl radicals having from about six to about 20 carbon atoms, preferably from about six to about 10 carbon atoms; alkenyl radicals having from about two to about 30 carbon atoms, preferably from about two to about 20 carbon atoms; cycloalkyl radicals having from about three to about 40 carbon atoms, preferably from about three to about 30 carbon atoms; aralkyl and alkaryl radicals having from about six to about 40 carbon atoms, preferably from about six to about 30 carbon atoms; a halogen radical selected from the group consisting of fluorine, chlorine, bromine and iodine, preferably chlorine; a hydroxyl group; an alkoxy or aryloxy group; and a hydrocarbyl group, such as defined above, carrying halogen, hydroxyl or alkoxy or aryloxy; provided that at least one, preferably from about one to about four, of each of R.sub.1 to R.sub.8 is a sulfonato group (--SO.sub.3.sup.-) or an alkyl, aryl, alkenyl, cycloalkyl, aralkyl or alkaryl group carrying a sulfonato group; M is sulfur or oxygen, preferably oxygen; E is phosphorus, arsenic, antimony or nitrogen, preferably phosphorus; and F is phosphorus, arsenic or antimony, preferably phosphorus.
Abstract:
Ethylene is oligomerized to even numbered alpha-monoolefins principally in the C.sub.4 to C.sub.40 range with minimal concomittant production of high molecular weight polyethylene by reacting ethylene in a diol solvent in an oligomerization reaction zone at elevated pressure with a nickel complex catalyst composition produced by combining in the reaction zone, (a) a stable preformed complex of nickel, ethylene and hydride in a diol solvent, said complex being prepared by contacting in a diol solvent and in the presence of ethylene, a nickel salt, a base and a boron hydride transfer agent and (b) a suitable bidentate ligand; the stable nickel complex solution and the bidentate ligand being added in separate portions to the reaction zone. These stable complexes of nickel, ethylene and hydride in diol solution are considered to be novel oligomerization catalyst precursor compositions.