摘要:
The present invention relates to compounds composed essentially of a linear, cyclic or branched polyorganosiloxane having, per molecule, at least 3 siloxy units, including at least one siloxy functional unit of formula: ##STR1## where R.sup.1 represents a C.sub.1 to C.sub.4 alkyl or phenyl radical, X contains an N,N'-di- and/or trisubstituted phenylenediamine functional group, bonded to the silicon via an Si-(hydrocarbon linking unit)-N and/or Si-(hydrocarbon linking unit)-C bond, and a is a number chosen from 0, 1 and 2. The present invention also relates to the use of such compounds as antiozonants for rubbers and in particular for rubber compositions for tires.
摘要:
This invention relates to a method of preparing taxane derivatives of general formula (I) by esterification of protected baccatine III or 10-deacetylbaccatine III by means of an acid of general formula (VII), elimination of protection groupings of the ester obtained, and acylation of the amine function of the side chain. In formulae (I) and (VII): Ar stands for aryl, R is hydrogen or acetyl, R.sub.1 is benzoyl or R.sub.2 -CO--O- in which R.sub.2 is alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, bicycloalkyl, phenyl or heterocyclyl, R.sub.3 and R.sub.4 may be the same or different and represent hydrogen, alkyl, alkenyl, aralkyl, aryl or alkoxy, and R.sub.5 is an alkyl radical substituted by one or more chlorine atoms (2,2,2-trichloroethyl, 2-trichloromethylisopropyl). ##STR1##
摘要翻译:本发明涉及一种通过通式(Ⅶ)的酸对保护的巴胺三醇或10-脱乙酰基浆果赤霉素III进行酯化反应制备通式(I)的紫杉烷衍生物的方法,消除得到的酯的保护基和酰化 的侧链的胺官能团。 在式(I)和(VII)中:Ar代表芳基,R是氢或乙酰基,R1是苯甲酰基或R2-CO-O-,其中R2是烷基,烯基,炔基,环烷基,环烯基,双环烷基,苯基或杂环基 R 3和R 4可以相同或不同,代表氢,烷基,烯基,芳烷基,芳基或烷氧基,R5是被一个或多个氯原子取代的烷基(2,2,2-三氯乙基,2-三氯甲基异丙基) 。
摘要:
The invention relates to a process and a nucleophilic reagent which is useful for grafting a substituted difluoromethyl group onto a compound containing at least one electrophilic function, characterized in that it comprises: a) a fluorocarboxylic acid of formula Ew--CF.sub.2 --COOH where Ew represents an electron-withdrawing atom or group, at least partially salified with an organic or inorganic cation, and b) a polar aprotic solvent; and in that the content of releasable protons carried by its various components, including their impurities, is at most equal to half the initial molar concentration of the said fluorocarboxylic acid.
摘要:
This invention relates to a method of preparing esters of baccatine III or 10-deacetylbaccatine III of formula (I) by esterification of protected baccatine III or 10-deacetylbaccatine III of formula (II) by means of an activated acid of formula (III). The esters of formula (I) can be used to prepare taxane derivatives having remarkable antileucemia and antitumor properties. In formulae (I), (II) and (III) Ar is an aryl radical, R.sub.1 is a hydrogen atom or an aryl radical or an R.sub.4 --O--CO-- radical (R.sub.4 =alkenyl, alkynyl, optionally substituted alkyl, cycloalkyl, cycloalkynyl, bicycloalkyl, phenyl, heterocyclyle) and R.sub.2 is a hydrogen atom, and R.sub.3 stands for a hydroxy function protection grouping, or R.sub.1 is defined as above and R.sub.2 and R.sub.3 together form a 5 or 6 membered, saturated heterocyclic ring, G.sub.1 is an acetyl radical or a hydroxy function protection grouping, G.sub.2 is a hydroxy function protection grouping, and X is an acyl radical, aryl, radical or halogen atom. ##STR1##
摘要:
The invention relates to a nucleophilic reagent which is useful for grafting a substituted difluoromethyl group onto a compound containing at least one electrophilic function, or for the synthesis of oxysulphide-containing and fluorine-containing organic derivatives, wherein said reagent comprises: a) a fluorocarboxylic acid of formula Ew—CF2—COOH where Ew represents an electron-withdrawing atom or group, at least partially salified with an organic or inorganic cation, and b) a polar aprotic solvent; and in that the content of releasable protons carried by its various components, including their impurities, is at most equal to half the initial molar concentration of the said fluorocarboxylic acid. A synthetic process uses this reagent by heating in order to graft a substituted difluoromethyl group onto various compounds.
摘要:
A compound of the formula I: ##STR1## wherein Ar represents an aryl radical;R.sub.1 represents a hydrogen atom, an aroyl radical, or a radical of the formula R.sub.4 --O--CO;R.sub.2 and R.sub.3 together form a 5- or 6-membered saturated heterocycle;G.sub.1 represents an acetyl radical or a protecting group of the hydroxyl functional group; andG.sub.2 represents a protecting group of the hydroxyl functional group.
摘要翻译:式I的化合物:其中Ar表示芳基; R1表示氢原子,芳酰基或式R4-O-CO的基团; R2和R3一起形成5-或6-元饱和杂环; G1表示羟基官能团的乙酰基或保护基; G 2表示羟基官能团的保护基。
摘要:
This invention relates to a method of preparing taxane derivatives of general formula (I) by esterification of protected baccatine III or 10-deacetylbaccatine III by means of an acid of general formula (VII), elimination of protection groupings of the ester obtained, and acylation of the amine function of the side chain. In formulae (I) and (VII): Ar stands for aryl, R is hydrogen or acetyl, R.sub.1 is benzoyl or R.sub.2 --CO--O-- in which R.sub.2 is alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, bicycloalkyl, phenyl or heterocyclyl, R.sub.3 and R.sub.4 may be the same or different and represent hydrogen, alkyl, alkenyl, aralkyl, aryl or alkoxy, and R.sub.5 is an alkyl radical substituted by one or more chlorine atoms (2,2,2-trichloroethyl, (2-trichloromethylisopropyl). ##STR1##
摘要:
Novel bis(dialkylamide) compounds having the formula: R2R3NOC—R1a—CONR4R5 are particularly useful solvents, for example in plant-protection formulations.
摘要:
The invention relates to silicon oils, more particularly, to a novel method for the preparation of a silicon oil by polymerization and rearrangement of cyclic siloxanes in the presence of an alkaline catalyst and a co-catalyst which is a cryptand (macroheterobicyclic diamine) acting as a polymerization accelerator.
摘要:
This invention relates to a method for preparing taxane derivatives of general formula (I) by esterification at a temperature between −10 and 60° C. of a derivative of baccatine III or 10-deacetyl baccatine III of general formula (II) by means of an acid of general formula (III), followed by replacement of the protective groupings G1, G2 and R2 of the resulting product by hydrogen atoms. In formulae (I), (II) or (III), Ar stands for an aryl radical; R stands for hydrogen or acetyl; R1 is benzoyl or ter.butoxycarbonyl; G1 is a hydroxy function protective grouping, G2 stands for the acetyl radical or a hydroxy function protective grouping, and R2 stands for a hydroxy function protective grouping.