摘要:
The invention relates to a novel process for the sulfinylation of heterocyclic compounds, which comprises reacting:a compound of the formula RS(O)X, in which R is a linear or branched alkyl group having from 1 to 4 carbon atoms, which is substituted with one or more identical or different halogen atoms and X is a halogen atom, the hydroxyl group or one of the salts thereof, a group --NR.sub.2 R.sub.3, R.sub.2 and R.sub.3 being alkyl or haloalkyl groups of 1 to 4 carbon atoms, or an aryloxy or aralkoxy group, in which the aryl part preferably corresponds to a phenyl group, which is optionally substituted with one or more halogen atoms or alkyl or haloalkyl groups of 1 to 4 carbon atoms,with a heterocyclic compound Het chosen from the group consisting of pyrroles, pyrazoles, imidazoles, oxazoles, isoxazoles, thiazoles, isothiazoles and triazoles, all of these heterocycles Het optionally being substituted with one or more atoms or groups chosen from halogen, amine, alkylamine, dialkylamine, nitrile, aryl, and aryl substituted with one or more halogen atoms and/or one or more alkyl, haloalkyl or SF.sub.5 groups.
摘要:
A process for the preparation of 2,2-difluoro-1,3-benzodioxole from 2,2-dichlorol,3-benzodioxole. 2,2-Difluoro-1,3-benzodioxole is prepared by reaction of 2,2-dichloro-1,3-benzodioxole with potassium fluoride in the presence of an effective quantity of a catalyst selected from potassium hydrogen fluoride, sodium hydrogen fluoride, cesium hydrogen fluoride, rubidium hydrogen fluoride, and quaternary ammonium hydrogen fluoride. 2,2-Difluoro-1,3-benzoxodiole is an intermediate compound which is used particularly for the preparation of products for agricultural chemistry and for the synthesis of pharmaceutical products.
摘要:
This invention relates to new methods for preparing chemical compounds, in particular fungicidal compounds, especially iodinated derivatives of chromones, preferably compounds of formula (I), and intermediate compounds useful for these methods.
摘要:
Novel .beta.-aminovinyl ketones of the general formula ##STR1## wherein R.sup.1 is, in particular, an alkenyl, alkynyl, cycloalkyl or cycloalkenyl group; R.sup.2 is, in particular, an electron-attracting substituent such as nitro, acyl, ester, alkylthio, carbamoyl, thiocarbamoyl or haloalkyl; R.sup.3 is, in particular, an alkyl or alkoxy group or a halogen atom; n is 1 or 2 and m is 0, 1, 2 or 3. A method for preparing such compounds by carrying out a condensation reaction between ketone R.sup.1 --CO--CH.sub.3 and, in particular, benzonitrile substituted by (R.sup.2).sub.n and optionally (R.sup.3).sub.m, in the presence of a strong base, as well as a process employing said .beta.-aminovinyl ketones of general formula (VI) for preparing the corresponding .beta.-diketones, are also disclosed.
摘要:
The invention relates to a process for the preparation of a compound of formula (I) wherein: R1 represents C1-4 haloalkyl, fluorine, chlorine or bromine; and R2 represents hydrogen or C1-4 alkoxy; which process comprises the reaction of the corresponding ortho-nitrohalobenzene of formula (II): wherein R1 and R2 are as hereinbefore defined and X represents a fluorine or bromine atom, with, when X represents a fluorine atom: (a) an alkali metal cyanide, in a non aqueous solvent, optionally in the presence of a catalyst; or when X represents a bromine atom: (b) cuprous cyanide, in a non aqueous solvent, optionally in the presence of a catalyst selected from an alkali metal bromide or an alkaline earth metal bromide; or (c) an alkali metal cyanide, in a non aqueous solvent, in the presence of a catalytic amount of cuprous cyanide and a phase transfer catalyst.
摘要:
A process for preparing a compound of the formula: which comprises reacting a compound of the formula: wherein R1 is C1-6 straight- or branched-chain alkyl, with a compound of the formula: in an aprotic solvent in the presence of base.