摘要:
A process for the preparation of 3-substituted 4-cyanopyrrole compounds of the formula (I) ##STR1## in which Ar has the meaning given in the description, by reaction in a 1st stage of bromides (II)Ar--Br (II)with acrylonitrile in the presence of a solvent and a suitable reaction auxiliary to give acrylonitrile derivatives (III)Ar--CH.dbd.CH--CN (III)and in a 2nd stage with a phenylsulphonylmethyl isocyanide (IV)Ph--SO.sub.2 --CH.sub.2 --CN (IV)in the presence of a solvent and optionally in the presence of a suitable reaction auxiliary, characterised in that the 1st stage is carried out in the presence of a palladium catalyst and the 2nd stage in the presence of a 1.2- to 1.8-fold molar excess of alkali metal alcoholate or alkali metal hydroxide.
摘要:
A process for the preparation of a hydroxybenzaldoxime O-ether of the formula ##STR1## in which R.sup.1 represents alkyl, comprising(a) in a first step, hydrogenating a nitro-benzaldoxime O-ether of the formula ##STR2## using the calculated amount of hydrogen in the presence of a catalyst and in the presence of a diluent, and(b) in a second step, reacting the amino-benzaldoxime O-ether of the formula ##STR3## thus obtained with a diazotizing agent in acidic, aqueous solution, and, without isolation, thermally hydrolyzing the resultant diazonium salt of the formula ##STR4## in which X.crclbar. represents an equivalent of an inorganic anion, in acidic, aqueous solution.
摘要:
A process for the preparation of a hydroxybenzaldoxime O-ether of the formula ##STR1## in which R.sup.1 is alkyl, alkenyl or alkinyl, comprising reacting an aminobenzaldoxime O-ether of the formula ##STR2## in which R.sup.1 has the abovementioned meaning, with a diazotizing agent in acidic, aqueous solution, and thermally hydrolyzing the resulting diazonium salt of the formula ##STR3## in which X.crclbar. in an equivalent of an inorganic anion andR.sup.1 has the abovementioned meaning,in acidic, aqueous solution without intermediate isolation.The products are intermediates for agricultural and pharmaceutical chemicals.Novel amino-benzaldoxime O-ethers of the formula ##STR4## wherein R.sup.1 has the above-mentioned meaning.
摘要:
The known .beta.-hydroxyethyl-(1,2,4-triazole) derivatives of the formula ##STR1## in which R.sup.1 represents alkyl, halogenoalkyl, alkenyl, alkinyl, optionally substituted cycloalkyl, optionally substituted cycloalkenyl, optionally substituted aryl, optionally substituted aralkyl, optionally substituted aralkenyl or an optionally substituted heterocyclic radical andR.sup.2 represents hydrogen, alkyl, halogenoalkyl, alkenyl, alkinyl, optionally substituted cycloalkyl, optionally substituted cycloalkenyl, optionally substituted aryl, optionally substituted aralkyl, optionally substituted aralkenyl or an optionally substituted heterocyclic radical,are prepared by a new process, which comprises stirring a .beta.-hydroxyethyl-(1,3,4-triazole) derivative of the formula ##STR2## in which R.sup.1 and R.sup.2 have the abovementional meanings, in the presence of a base and in the presence of an aprotic, dipolar diluent.
摘要:
Known .beta.-hydroxyethyl-(1,2,4-triazole) derivatives of the formula ##STR1## in which R represents alkyl, halogenoalkyl, optionally substituted cycloalkyl or optionally substituted phenyl,Z represents halogen, alkyl, cycloalkyl, alkoxy, alkylthio, halogenoalkyl, halogenoalkoxy, halogenoalkylthio, optionally substituted phenyl, optionally substituted phenoxy, optionally substituted phenylalkyl or optionally substituted phenylalkoxy andm represents the number 0, 1, 2 or 3,are prepared by a new process, which comprises reacting oxiranes of the formula ##STR2## in which R, Z and m have the abovementioned meaning, with 1,2,4-triazole of the formula ##STR3## in the presence of a cylcic amid of the formula ##STR4## in which R.sup.1 represents alkyl with 1 to 4 carbon atoms andn represents the number 3, 4 or 5,as diluent, and in the presence of a base.
摘要:
The present invention relates to a process for preparing fluoromethyl-substituted heterocycles of the formula (I) in which R1, R2, R3 and A are each as defined in the disclosure, by fluorinating the corresponding chloromethyl-substituted precursors.
摘要:
The present application relates to a plurality of novel processes for preparing 2-(2-hydroxyphenyl)-2-(alkoxyimino)-N-methylacetamide derivatives, to novel intermediates for their preparation, and to processes for preparing these intermediates.
摘要:
The present invention provides processes for preparing 2-(2-hydroxyphenyl)-2-(alkoxyimino)-N-methylacetamides, to intermediates for this preparation, and to processes for preparing those intermediates.
摘要:
The invention relates to a process for preparing substituted arylpyrazoles of the general formula (I) in which R1, R2, R3 and R4 are each as defined in the description, and to novel intermediates for preparing these arylpyrazoles.