摘要:
A catalyst is produced by bonding a homogeneous catalyst to the surface of a catalyst support. A catalyst may include a catalyst support, a spacer molecule bonded to the catalyst support, and a homogeneous catalyst bonded to the spacer molecule. A catalyzed reaction can be carried out by providing reactants in a first phase and providing a catalyst as described herein in the first phase.
摘要:
Disclosed herein are phosphine compounds represented by the general formula (4): and corresponding phosphonium salts represented by the general formula (4a): Also disclosed are processes for the preparation of these phosphines and phosphonium salts as well as their use as ligands in catalytic reactions.
摘要:
A phosphine compound represented by general formula (1) wherein R′ and R″ independently are selected from alkyl, cycloalkyl and 2-furyl radicals, or R′ and R″ are joined together to form with the phosphorous atom a carbon-phosphorous monocycle including at least 3 carbon atoms or a carbon-phosphorous bicycle; the alkyl radicals, cycloalkyl radicals, and carbon-phosphorous monocycle being unsubstituted or substituted by at least one radical selected from the group of alkyl, cycloalkyl, aryl, alkoxy, and aryloxy radicals; Cps is a partially substituted or completely substituted cyclopentadien-1-yl group, including substitutions resulting in a fused ring system, and wherein a substitution at the 1-position of the cyclopentadien-1-yl group is mandatory when the cyclopentadien-1-yl group is not part of a fused ring system or is part of an indenyl group. These phosphines can be used as ligands in catalytic reactions.
摘要:
Preceramic polymers are prepared by mixing an organosilicon oligomer or polymer containing a multiplicity of Si--H and/or Si--N functional groups with a borane in an organic solvent for a sufficient time for the reactants to react, wherein the molar ratio of the organosilicon polymer repeat unit to borane is 15 or less.
摘要:
Disclosed herein are phosphine compounds represented by the general formula (4): and corresponding phosphonium salts represented by the general formula (4a): Also disclosed are processes for the preparation of these phosphines and phosphonium salts as well as their use as ligands in catalytic reactions.
摘要:
A catalyst is produced by bonding a homogeneous catalyst to the surface of a catalyst support. A catalyst may include a catalyst support, a spacer molecule bonded to the catalyst support, and a homogeneous catalyst bonded to the spacer molecule. A catalyzed reaction can be carried out by providing reactants in a first phase and providing a catalyst as described herein in the first phase.