The present invention relates to a novel phenonthroline based pincer complexes and process for preparation thereof. The present invention also provides a one pot process for the conversion of carbon dioxide to methanol in the presence of a molecularly defined pincer-type single-site Ru-catalyst and secondary amine. Further the present invention provides the use of phenonthroline based pincer complexes for the esterification of alcohols and hydrogenation of esters under mild conditions.

The present invention relates to a novel phenonthroline based pincer complexes and process for preparation thereof. The present invention also provides a one pot process for the conversion of carbon dioxide to methanol in the presence of a molecularly defined pincer-type single-site Ru-catalyst and secondary amine. Further the present invention provides the use of phenonthroline based pincer complexes for the esterification of alcohols and hydrogenation of esters under mild conditions.

Disclosed is an industrial method for efficient production of an ,-difluoroaldehyde compound, which includes reaction of an ,-difluoroacetate with hydrogen gas (H.sub.2) in the presence of a ruthenium catalyst and a base. By the adoption of specific reaction conditions (catalyst, base, pressure etc.), it is possible to produce the target ,-difluoroaldehyde compound with a high conversion rate and high selectivity.

Carbon-carbon bond forming reactions are the cornerstone of organic chemistry. A new class of ligands was developed for transition metal catalyzed cross-coupling reactions. These phosphine-urea ligands incorporate a urea subunit into the backbone of the ligand, which is designed to bind to the organometallic coupling partner and simultaneously facilitate and direct transmetalation of the nucleophile. Synthetic routes were designed and executed to synthesize phosphine-urea ligands. These ligands catalyze a wide variety of cross-coupling reactions including Suzuki, Negishi, and Buchwald-Hartwig cross-couplings. Aryl-aryl, alkyl-aryl, and alkyl-alkyl CC cross-couplings are performed successfully with these ligands. In addition, specific chiral phosphine-urea ligands catalyze Negishi cross-couplings enantioselectively from a racemic alkylzinc nucleophile.

Disclosed is an industrial method for efficient production of an ,-difluoroaldehyde compound, which includes reaction of an ,-difluoroacetate with hydrogen gas (H.sub.2) in the presence of a ruthenium catalyst and a base. By the adoption of specific reaction conditions (catalyst, base, pressure etc.), it is possible to produce the target ,-difluoroaldehyde compound with a high conversion rate and high selectivity.

An ethylene/butadiene copolymer comprising statistically distributed ethylene units and butadiene units is provided. The molar fraction of the ethylene units in the copolymer is greater than or equal to 50%, relative to the total number of moles of ethylene and butadiene units. The microstructure of the copolymer is homogeneous.

A process for preparing such a copolymer and also the uses of this copolymer, in particular in rubber compositions for tires is also provided.

The present invention relates to the technical field of organic chemistry, specifically an asymmetrical hydrogenation of an -ketonic acid compound, the technical proposal being as shown by the following formula: ##STR00001## Wherein R.sup.1 is a phenyl, a substituted phenyl, a naphthyl a substituted naphthyl, a C.sub.1-C.sub.6 alkyl or aralkyl, the substitute is a C.sub.1-C.sub.6 alkyl, a C.sub.1-C.sub.6 alkoxy, a halogen, the number of the substituents is 1-3. M is a chiral spiro-pyridyl amido phosphine ligand iridium complex having the following structure, ##STR00002## Wherein, R is hydrogen, 3-methyl, 4-.sup.tBu or 6-methyl

In one aspect, phosphine compounds comprising three adamantyl moieties (PAd.sub.3) and associated synthetic routes are described herein. Each adamantyl moiety may be the same or different. For example, each adamantyl moiety (Ad) attached to the phosphorus atom can be independently selected from the group consisting of adamantane, diamantane, triamantane and derivatives thereof. Transition metal complexes comprising PAd.sub.3 ligands are also provided for catalytic synthesis including catalytic cross-coupling reactions.

Embodiments of the present disclosure provide for biaryl ligands (also referred to herein as biaryl compound), biaryl complexes, methods of making biaryl compounds, methods of making single enantiomers of these biaryl compounds, methods of use (e.g., catalysis), and the like.

Embodiments of the present disclosure provide for biaryl ligands (also referred to herein as biaryl compound), biaryl complexes, methods of making biaryl compounds, methods of making single enantiomers of these biaryl compounds, methods of use (e.g., catalysis) and the like.