摘要:
The present invention relates to the manufacture of the compounds of formula (I) said compounds of formula (I) being valuable intermediates in the manufacture of Dolastatin 10 analogues, which are useful in the treatment of cancer.
摘要:
The present invention relates to the manufacture of the compounds of formula (I) said compounds of formula (I), or their lithium salts, are valuable intermediates in the manufacture of Dolastatin 10 analogues, which are useful in the treatment of cancer.
摘要:
The present invention relates to a process for making a compound of formula (I) The process involves the use of an enzyme. Compounds of formula (I) are intermediates in the manufacture of Dolastatin 10 analogues, which are useful in the treatment of cancer.
摘要:
A process for the racemization of atropisomeric bis(phosphine oxide) compounds of formula I: in their (S) or (R) or non-racemic form, is useful for preparing optical active bisphosphine ligands, that form optical active complexes with transition metals. Racemization is thermal and carried out in high or low boiling solvent, under normal or elevated pressure at 105 to 3.5×107 Pa. Heating is performed in a system that allows heating up to 400° C. (reactor, autoclave, aluminum block, round-bottom flask with heating/stirring mantle and the like) or by microwave irradiation or in the melt at a temperature from 260 to 400° C.
摘要:
The invention is concerned with novel water-soluble racemic or optically active compounds of formulae ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently signify lower alkyl or lower alkoxy;m and n are 0, 1 or 2; andX signifies hydrogen, an alkali :metal, the equivalent of an earthalkali metal or an ammonium ion;with the provision that R.sup.3 is in position 4 or 5 and R.sup.4 is in position 4' or 5'. The invention is also concerned with complexes of such compounds with a metal of Group VIII. These complexes are, useful as catalysts for asymmetric hydrogenation and for enantioselective hydrogen displacement in prochiral allylic systems.
摘要:
A process for the manufacture of 3-phytyl-2,5,6-trimethylhydroquinone-1-acetate, and optionally therefrom tocopheryl acetate, comprises either C-alkylating 2,3,6-trimethylhydroquinone-1-acetate with isophytol or phytol in the presence of a sulphur(VI) containing catalyst of the formula R1SO2OH, wherein R1 signifies hydroxy, halogen, lower alkyl, halogenated lower alkyl or aryl, in an aprotic organic solvent, or O-alkylating 2,3,6-trimethylhydroquinone-1-acetate with a phytyl halide in a polar aprotic organic solvent in the presence of a base, and subjecting the so-obtained 4-O-phytyl-2,3,6-trimethylhydro-quinone-1-acetate to a rearrangement reaction, and in each case optionally submitting the so-obtained 3-phytyl-2,5,6-trimethylhydroquinone-1-acetate to a ring closure reaction to produce tocopheryl acetate. The invention also includes the novel compound 3-phytyl-2,5,6-trimethylhydroquinone-1-acetate and certain stereoisomers thereof, and also the further novel compound 4-hydroxy-2,3,6-trimethyl-5-[3-(4,8,12-trimethyltridecyl)-but-3-enyl]phenyl acetate which itself is one of several isomers of 3-phytyl-2,5,6-trimethylhydroquinone-1-acetate formed by isomerization under the influence of heating, e.g. during its distillation as part of the isolation and purification procedure following its manufacture as indicated above. (All-rac)-α-tocopherol, which may be derived from its acetate, is known to be the most active industrially important member of the vitamin E group.
摘要:
A dispensing device including a container for a supply of items forming a web. The dispensing device includes a recess formed in an outer wall of the container, a braking unit overlapping the recess. The braking unit includes two lips which work together when items are dispensed and a linear slit between the two lips which enables the items to pass between the two lips, the two lips being fitted with bristles which constitute active elements of the two lips, unattached ends of the bristles of one of the lips extend into, and mesh with, an area of unattached ends of the bristles of the opposite lip. The items are camisole-shaped and sequentially joined bags having a body with a bottom part and handles at the upper part. The bottom part of the body of one of the bags is connected to the leading edge of the handles of the next bag. A nozzle for dispensing the bags is connected to the recess, the nozzle including a hollow cover in the base of which there is an oblong and virtually linear opening, the distance between the edges of the opening being considerably larger than the thickness of a bag. The braking unit is attached to the hollow cover in such a way that it overlaps the linear opening in the hollow cover.
摘要:
The invention relates to a multiple insertion head for mounting components (300) onto substrates, said insertion head comprising a carrier (200) which is arranged in such a way that it can rotate about a rotational axis (D) and is provided with a plurality of receiving tools (210) that are arranged in such a way that they can be displaced in a mounting direction at an angle to the rotational axis (D), said receiving tools being used to receive the components (300). Each receiving tool (210) is provided with at least one active drive and/or sensor, ensuring that the components (300) are rapidly positioned with the highest precision.