A tetraanionic OCO pincer ligand metal-oxo-alkylidene complex is prepared from a trianionic pincer ligand supported metal-alkylidyne. The metal can be tungsten or other group 5-7 transition metal. The tetraanionic pincer ligand metal-oxo-alkylidene complex, a trianionic OCO pincer ligand metal complex, or a trianionic ONO pincer ligand metal complex can be used to polymerize cycloalkenes. The poly(cycloalkene)s are predominantly cis-alkene macrocyclics.

The present invention provides a complex of formula (1), ##STR00001##
wherein, M is palladium or nickel, R.sub.1 and R.sub.2 are independently organic groups having 1-20 carbon atoms, or R.sub.1 and R.sub.2 are linked to form a ring structure with the phosphorus atom, R.sub.3 is selected from the group consisting of substituted and unsubstituted aryl, substituted and unsubstituted heteroaryl, and substituted and unsubstituted metallocenyl, R.sub.4 is an organic group having 1-20 carbon atoms, n is 0, 1, 2, 3, 4 or 5, and X is an anionic ligand. The invention also provides a process for the preparation of the complex, and its use in carbon-carbon or carbon-nitrogen coupling reactions.

Organosilicon Lewis acids supported on activated oxides and metal oxo complexes grafted on the organosilicon Lewis acids as heterogeneous catalysts and the related compositions, methods and systems are described. These organosilicon Lewis acids and the grafted metal oxo complexes catalyze industrially important chemical reactions including, respectively, CF bond activation and olefin metathesis reactions such as homocoupling and polymerizations.

The present invention provides a complex of formula (1),

##STR00001##

wherein, M is palladium or nickel, R.sub.1 and R.sub.2 are independently organic groups having 1-20 carbon atoms, or R.sub.1 and R.sub.2 are linked to form a ring structure with the phosphorus atom, R.sub.3 is selected from the group consisting of substituted and unsubstituted aryl, substituted and unsubstituted heteroaryl, and substituted and unsubstituted metallocenyl, R.sub.4 is an organic group having 1-20 carbon atoms, n is 0, 1, 2, 3, 4 or 5, and X is an anionic ligand. The invention also provides a process for the preparation of the complex, and its use in carbon-carbon or carbon-nitrogen coupling reactions.

A complex of formula (1), ##STR00001##
wherein, M is palladium or nickel, R.sub.1 and R.sub.2 are independently organic groups having 1-20 carbon atoms, or R.sub.1 and R.sub.2 are linked to form a ring structure with the phosphorus atom, R.sub.3 is selected from the group consisting of substituted and unsubstituted aryl, substituted and unsubstituted heteroaryl, and substituted and unsubstituted metallocenyl, R.sub.4 is an organic group having 1-20 carbon atoms, n is 0, 1, 2, 3, 4 or 5, X is an anionic ligand. A process for the preparation of the complex, and its use in carbon-carbon or carbon-nitrogen coupling reactions is also provided.

A tetraanionic OCO pincer ligand metal-oxo-alkylidene complex is prepared from a trianionic pincer ligand supported metal-alkylidyne. The metal can be tungsten or other group 5-7 transition metal. The tetraanionic pincer ligand metal-oxo-alkylidene complex, a trianionic OCO pincer ligand metal complex, or a trianionic ONO pincer ligand metal complex can be used to polymerize cycloalkenes. The poly(cycloalkene)s are predominantly cis-alkene macrocyclics.

Catalyst compositions based on Ruthenium- or Osmium-based complex catalysts and specific co-catalysts are provided for selectively hydrogenating nitrile rubbers in the presence of such catalyst compositions.

Catalyst materials for olefin metathesis reactions. The catalyst materials comprise a ruthenium phosphinimine complex. The ruthenium phosphinimine may be synthesized without bound N-heterocyclic carbene (NHC) or phosphine ligands, thereby providing significant advantageous in conversion, selectivity, and stability compared to existing ruthenium-based catalysts.

P-chirogenic organophosphorus compounds of general formula (I), a process for the synthesis of the compounds of formula (I), and intermediate products of general formulae (II), (III) and (IV), as shown below, are involved in the synthesis of compounds (I). ##STR00001## Metal complexes comprising compounds (I) as ligands are also described. The compounds and complexes are useful in asymmetric catalysis by transition metal complexes or organocatalysis, especially for asymmetric hydrogenation or allylation. Compounds of general formula (I) may be useful as agrochemical and therapeutic substances, or as reagents or intermediates for fine chemistry.

A catalytically active substance includes a copper (I) sulfide mineral particle, and an alkyne functionalized molecule bound to a surface of the copper (I) sulfide mineral particle. In an example method, a copper (I) sulfide mineral is reacted with an alkyne functionalized molecule to form a catalytically active substance. The catalytically active substance is reacted with an azide functionalized molecule to couple the catalytically active substance with the azide functionalized molecule.