Abstract:
The invention relates to novelligands of the phosphanylbenzothiophenyl-dihydroisoxazoline, phosphanyl-dihydrooxazolyl-indole and phosphanyl-dihydrooxazolyl-benzofuran type, especially compounds of formula (I) and mixtures of such compounds, wherein X is oxygen, sulfur, selenium or NO, wherein a is unsubstituted or substituted aryl, or alkyl or substituted alkyl and to processes for their preparation, to novel precursors and intermediates, to complexes with the said ligands, to their preparation and to their use as catalysts in organic synthesis (especially asymmetric organic synthesis).
Abstract:
The invention relates to synthesis methods for the preparation of statin derivatives, which methods proceed by way of a key intermediate of formula I wherein X is halogen, acyloxy, activated hydrocarbyloxy, activated hydrocarbylthio or N(CH 3 )OCH 3 , R a is a hydroxy-protecting group, and R b is a carboxy-protecting group, and, as well as to the compound of formula I, to further intermediates and methods for their preparation by Friedel-Crafts acylation.
Abstract:
There is described a process for the preparation of compounds of formula (1) starting from the reaction of the compounds of formulae (24), (25) and (26) to form the compound of formula (23), wherein in each case R1, R2 and R3 are each independently of the others an unsubstituted or substituted organic radical; R4 is hydrogen, unsubstituted or substituted C1-C8alkyl, C1-C8alkoxy, phenoxy or benzyloxy, or halogen; Y1 and Y2 are each independently of the other hydrogen or a protecting group, or Y1 and Y2 together are a protecting bridge; and X1 is hydrogen, an organic radical or a cation; and also novel intermediates.
Abstract:
The present invention relates to the use of metal complex compounds having hydrazide ligands as oxidation catalysts. Further aspects of the invention are formulations comprising such metal complex compounds, novel metal complex compounds and novel ligands. The metal complex compounds are used especially for enhancing the action of peroxides, for example in the treatment of textile material, without at the same time causing any appreciable damage to fibres and dyeings. There is also no appreciable damage to fibres and dyeings if these metal complexes are used in combination with an enzyme or a mixture of enzymes.
Abstract:
A process for the preparation of an 1, 1 -disubstituted oxirane is disclosed, wherein an organic sulphide is reacted in a polar solvent with an educt containing a leaving group attached to a primary or secondary carbon atom, and/or the sulfonium salt formed in this way is reacted with a ketone in presence of a base and a polar solvent. Oxiranes of the type obtained may be further converted into the corresponding a-hydroxyketone or a-aminoketone, either in one step by subjecting to aerobic oxidation in the presence of a transition metal catalyst, or in two steps by hydrolyzation in the presence of an aqueous acid to the corresponding dialcohol and subsequent selective oxidation. Further described are some novel epoxide intermediates. The a-hydroxyketones and a-aminoketones thus obtainable are useful inter alga as photoinitiators.
Abstract:
A process for the preparation of compounds of formula (1), by enzymatic acylation to form compounds of formulae (3a) and (3a') and then reacting the compound of formula (3a) with a compound introducing the radical of formula -CH 2 -COOR 8 , R 8 being an organic radical, and then reducing, and optionally hydrolysing, the resulting compound of formula (4).
Abstract:
The present invention relates to the use, as oxidation catalysts, of metal complex compounds having tetradentate ligands of formula (2) wherein all subsitutents have the meanings as defined in Claim 1. The present invention relates also to formulations comprising such metal complex compounds, to novel metal complex compounds and to novel ligands.
Abstract:
There is described a process for the preparation of compounds of formula (1) starting from the reaction of the compounds of formulae (24), (25) and (26) to form the compound of formula (23), wherein in each case R 1 , R 2 and R 3 are each independently of the others an unsubstituted or substituted organic radical; R 4 is hydrogen, unsubstituted or substituted C 1 -C 8 alkyl, C 1 -C 8 alkoxy, phenoxy or benzyloxy, or halogen; Y 1 and Y 2 are each independently of the other hydrogen or a protecting group, or Y 1 and Y 2 together are a protecting bridge; and X 1 is hydrogen, an organic radical or a cation; and also novel intermediates.