摘要:
Prostaglandins and intermediates thereof can be prepared readily, efficiently and industrially advantageously by separating an (E)-hydroxyvinyltin compound from the (E, Z)-enantiomer thereof prepared by the reaction of a hydroxy-1-algin with a tin halide, converting the same into a vinylcopper complex of general formula (VI) conducting the conjugate addition of the complex with alpha , beta -unsaturated cyclopentenone, and deblocking the product.
摘要:
The invention concerns novel compounds having the elements of group 11, 12 or 14 and a tridentate ligand, a method for preparing them and their use in particular as polymerisation catalyst.
摘要:
Dual cure organotin salts of strong organic acids, the use of such salts as catalysts and an improved process for producing the catalysts are provided. The catalysts are capable of effectively catalyzing esterification and transesterification reactions and urethane, silicone, melamine, ester and acrylic forming reactions and can simultaneously catalyze more than one reaction in a mixture of urethane, silicone, amino, ester and acrylic polymer forming reactants to produce a polymer mixture.
摘要:
A process for producing hydroxyalkyl monoacrylate of the present invention, comprises the steps of: reacting acrylic acid or an acrylic acid derivative with alkane diol for esterification and/or transesterification therebetween in the presence of a reaction catalyst comprising a stannoxane compound; recovering said reaction catalyst from a liquid reaction product by extraction; and recycling the recovered reaction catalyst to a reaction system for said esterification and/or transesterification. The process of the present invention is an industrially useful process for producing hydroxyalkyl monoacrylate, which is excellent in reactivity, selectivity for an aimed product, stability of a reaction catalyst used and stability of a reaction substrate and product, and is improved so as to effectively recover and reuse the reaction catalyst.
摘要:
Die Erfindung betrifft Monovinylzinntrihalogenide der allgemeinen Formel I sowie ein Verfahren zu deren Herstellung aus 1,3-Diketonen, Zinn-II-halogeniden und Halogensäuren.
摘要:
A quinolone- or naphthyridonecarboxylic acid derivative having a skeleton represented by general formula (I) at the 7-position and being useful as an antibacterial or a salt thereof, wherein R3 represents at least one group selected from among hydrogen, halogen, optionally substituted lower alkyl, lower alkoxy, lower alkylthio, nitro, cyano, optionally protected hydroxy and optionally protected amino; R4 represents at least one group selected from among hydrogen, optionally substituted lower alkyl, lower alkylidene and a group which forms a cycloalkane ring together with the carbon atom to which R4 is bonded; and R5 represents hydrogen, optionally substituted lower alkyl or cycloalkyl.