摘要:
A process for transition metal-catalyzed, asymmetric hydrogenation of acrylic acid derivatives of the formula (I) in which R1 is H or an optionally substituted alkyl, aryl or heteroaryl radical, R2 is an optionally substituted alkyl, aryl or heteroaryl radical, and R3 is H or a C1-C6-alkyl radical, which comprises hydrogenating compounds of the formula (I), optionally in a solvent, in the presence of one or more hydrogen donors, using a catalyst system which comprises a transition metal from the group of ruthenium, rhodium and iridium and a combination of a chiral phosphorus ligand of the formula (II) in which Cn, together with the two oxygen atoms and the phosphorus atom, forms an optionally substituted ring having from 2 to 6 carbon atoms and R4 is an optionally substituted alkyl, aryl, alkoxy or aryloxy radical or NR5R6 where R5 and R6 may each independently be H or an optionally substituted alkyl, aryl, aralkyl or alkaryl radical, or, together with the nitrogen atom, may form a ring, and an achiral phosphine ligand of the formula (III) in which R is an optionally substituted alkyl or aryl radical, to the corresponding compounds of the formula (IV) in which R1, R2 and R3 are each as defined above, and also a novel catalyst system for asymmetric transition metal catalysis.
摘要:
An iron (1), comprising: a water reservoir (10), configured to hold liquid water; a heatable soleplate (20), including at least one mist outlet opening (22); water atomization means (30), configured to atomize water from the water reservoir so as to generate a mist of water droplets at a mist generation site (32) mist distribution means (40), configured to distribute the mist from the mist generation site (32) to the at least one mist outlet opening (22), comprising: a distribution channel (42), extending from an air inlet (46), along the mist generation site (32), to the at least one mist outlet opening (22); and an air flow generator (44), disposed in or adjacent said distribution channel and configured to generate an airflow that transports the water droplets, from the mist generation site (32), through the distribution channel (42), to the at least one mist outlet opening (22).
摘要:
A VLIW processor comprising: a plurality of functional units (1, 3); a distributed register file (4) comprising a plurality of segments (5, 7, 9), the distributed register file (4) being accessible by the functional units (1, 3); a communication unit (11) for communication with a memory; a communication network (13) for coupling the functional units (1, 3) and the distributed register file (4); characterized in that the VLIW processor further comprises a spilling device (15) for transferring data between the distributed register file (4) and the communication unit (11).
摘要:
The present invention relates to an improved process for the preparation of lactic acid and or lactate from a magnesium lactate comprising medium. In said process, magnesium lactate is reacted with a hydroxide of sodium, calcium, and/or ammonium at a pH range between 9 and 12, preferably between 9.9 and 11, to form a lactate of sodium, potassium, calcium and/or ammonia and magnesium hydroxide. With the process according to the invention a lactate salt is formed and magnesium hydroxide. It is essential that said so-called SWAP reaction is conducted within a specific pH range: It was found that when conducting the SWAP reaction at a pH range between 9 and 12 magnesium hydroxide particles are formed which can easily be separated from the lactate salt solution formed.
摘要:
A device that is provided with a C-arm 2 for carrying medical devices 5, 6, which C-arm is attached to a carrier 3 so as to be adjustable along its circumference, which carrier is provided with a bearing block 7 that is provided on both sides with at least one row of roller elements 8. The C-arm is hollow and is provided on both sides with at least two oppositely situated internal running surfaces 9 for the roller elements. The device is characterized in accordance with the invention in that the running surfaces are provided with reinforcement elements 11. The invention also relates to a bearing block as described as part of the device in accordance with the invention.
摘要:
An iron (1), comprising: a water reservoir (10), configured to hold liquid water; a heatable soleplate (20), including at least one mist outlet opening (22); water atomization means (30), configured to atomize water from the water reservoir so as to generate a mist of water droplets at a mist generation site (32) mist distribution means (40), configured to distribute the mist from the mist generation site (32) to the at least one mist outlet opening (22), comprising: a distribution channel (42), extending from an air inlet (46), along the mist generation site (32), to the at least one mist outlet opening (22); and an air flow generator (44), disposed in or adjacent said distribution channel and configured to generate an airflow that transports the water droplets, from the mist generation site (32), through the distribution channel (42), to the at least one mist outlet opening (22).
摘要:
The invention relates to a device that is provided with a C-arm 7 for carrying medical devices 5, 6, which C-arm is adjustably attached to a carrier 4. The carrier is provided with a bearing block 11 that is provided with at least one row of roller elements 8 on both sides. The C-arm is constructed so as to be hollow and is provided on both sides with at least two oppositely situated running surfaces 15, 16 for the roller elements. The device is characterized in that a plurality of roller elements of one row is interconnected by means of an interconnecting member 9. The invention also relates to a bearing block of the described kind that forms part of the device in accordance with the invention.