Abstract: Isocyanates of the formula (I) in which X and Y are defined as in formula (I) of claim 1 can be prepared by reacting a compound of the formula (II) or its salts in which X and Y are defined as in formula (I), with 1 to 6 mol of phosgene per mole of compound of the formula (II), in the presence of 2 to 3.5 molar equivalents of a base per mole of compound of the formula (II) and in the presence of an aprotic organic solvent at a reaction temperature in the range from −30 to +60° C. to give the compound of the formula (I). The compounds (I) can be converted by reaction with nucleophiles to give addition products, such as carbamates, ureas and sulfonylureas and corresponding products, e.g. herbicidal sulfonylureas.

Abstract: Herbicidal sulfonylureas of the formula I, ##STR1## in which X is --O--, --O--NR.sup.2 -- or --SO.sub.2 --NR.sup.2 --, Y is --N-- or CH,R.sup.1 is (substituted) alkyl, (substituted) alkenyl or (substituted) alkynyl, or else, where X=O, (substituted) phenyl,R.sup.2 is H, alkyl, alkenyl, alkynyl or cycloalkyl,R.sup.3, R.sup.4 are H, (substituted) alkyl or (substituted) alkoxy, halogen, alkylthio, alkylamino or dialkylamino andR.sup.5, R.sup.

Abstract: The invention relates to an improved process for the preparation of a compound of the formula R.sup.1 -X-SO.sub.2 -NCO in whichX is O or NR.sup.2,R.sup.1 is alkylsulfonyl or phenyl which is optionally substituted by Hal, alkyl and/or alkoxy, andR.sup.2 is alkyl, by reactingR.sup.1 XH with ClSO.sub.2 NCO to give the compound R.sup.1 XCONHSO.sub.2 Cl followed by a rearrangement reaction, which comprises carrying out the process continuously in the presence or absence of an inert solvent.

Abstract: 2-Aminopyrimidines of the formula I ##STR1## in which X and Y are O or S and R.sup.1 and R.sup.2 independently of one another are lower alkyl, alkoxyalkyl or haloalkyl, are obtained by reacting propanediimidates of the formula IIR.sup.1 --X--C(.dbd.NH)--CH.sub.2 --C(.dbd.NH)--Y--R.sup.2 (II)or salts thereof with cyanamide in the presence of a base at pH values above pH 7.

Abstract: Process for the preparation of phosphino compounds Phosphorus-containing compounds of the formula (I)(R.sup.1)(R.sup.2)P(O)--CR.sup.3 R.sup.4 --CHR.sup.5 R.sup.6 (I)in whichR.sup.1 and R.sup.2 are alkyl, alkoxy or optionally substituted phenyl,R.sup.3 and R.sup.5 are H, R, optionally substituted phenyl, ROCO--, RO--CO--RO--, halogen, CN, RO--, RO--RO--R-CO--, H.sub.2 NCO--, RNHCO-- or RRNCO--, in which R is alkyl,R.sup.4 and R.sup.6 have the same meaning as defined for R.sup.1 and R.sup.2 or are a divalent radical--CO--R.sup.7 --COin whichR.sup.7 is oxygen, NR* or sulfur, and R* is H, optionally substituted phenyl or alkyl,are precursors for plant protection agents and fire retardants. According to the invention they can be prepared in high yields and high purity by reacting a compound (R.sup.1)(R.sup.2)P--OR.sup.8, in which R.sup.8 is alkyl or optionally substituted phenyl, with an alkene of the formula R.sup.3 R.sup.4 C.dbd.CR.sup.5 R.sup.

Abstract: Process for the preparation of pyrazolecarboxylic acid derivatives of the formula I ##STR1## in which R.sup.1 independently of one another is haloalkyl or halogen,R.sup.2 is alkyl or alkynyl,R.sup.3 is an alkali metal or alkaline earth metal, hydrogen, alkyl or alkoxyalkyl andn=1 or 2, by reaction of a compound of the formula II ##STR2## in which Z is chlorine or bromine, with an enol ether of the formula III ##STR3## in which R.sup.5 is alkyl, to give a compound of the formula IV ##STR4## and its subsequent aromatization to give the compound I, wherein the reaction of the compound II with the compound III to give the compound IV is carried out in a 2-phase system (aqueous/organic) in the presence of an inorganic base at temperatures of 40.degree.-100.degree. C. and at pH values of 7-10 and then the compound IV formed is aromatized, without prior isolation, under acidic conditions in a 2-phase system (aqueous/organic) to give the compound of the formula I.

Abstract: Known herbicides of the formula (I) ##STR1## in which R.sup.1 is alkyl, alkenyl or alkynyl, which are optionally substituted by halogen, alkoxy or alkoxycarbonyl,R.sup.2 is H, alkyl, alkenyl, alkynyl or cycloalkyl,R.sup.3 and R.sup.4 are H or alkyl,R.sup.5 and R.sup.6 are H, alkyl or alkoxy, each of which can be substituted by halogen, alkoxy or alkylthio, or are halogen, alkylthio, alkylamino or dialkylamino,or, if R.sup.2 or R.sup.3 is H, their salts with bases, can be obtained when compounds of the formula IIR.sup.1 --SO.sub.2 --NR.sup.2 --SO.sub.2 --NR.sup.3 --CO--OR.sup.7(II)in whichR.sup.1, R.sup.2 and R.sup.3 are as defined above,are reacted with compounds of the formula III ##STR2## in which R.sup.4, R.sup.5 and R.sup.6 are as defined above andR.sup.7 is alkyl, haloalkyl or optionally substituted phenyl,in an inert organic solvent, to give the compounds of the formula I.

Abstract: Known herbicides of the formula (I) ##STR1## in which R.sup.1 is alkyl, alkenyl or alkynyl, which are optionally substituted by halogen, alkoxy or alkoxycarbonyl,R.sup.2 is H, alkyl, alkenyl, alkynyl or cycloalkyl,R.sup.3 and R.sup.4 are H or alkyl,R.sup.5 and R.sup.6 are H, alkyl or alkoxy, each of which can be substituted by halogen, alkoxy or alkylthio, or are halogen, alkylthio, alkylamino or dialkylamino,or, if R.sup.2 or R.sup.3 is H, their salts with bases, can be obtained when compounds of the formula IIR.sup.1 -SO.sub.2 -NR.sup.2 -SO.sub.2 -NHR.sup.3 (II)in whichR.sup.1, R.sup.2 and R.sup.3 are as defined above,are reacted with compounds of the formula III ##STR2## in which R.sup.4, R.sup.5 and R.sup.6 are as defined above andR.sup.7 is alkyl, haloalkyl or optionally substituted phenyl,in an inert organic solvent, to give the compounds of the formula I.

Abstract: The present invention relates to a process for the preparation of arylalkylmethylsilanes of the formula I ##STR1## where X is CH.dbd.CH, N.dbd.CH, CH.dbd.N or S,R.sup.1 and R.sup.2 independently of one another are H, halogen, (C.sub.1 to C.sub.4)alkyl, (C.sub.1 to C.sub.4)alkoxy, (C.sub.1 to C.sub.4)alkylthio, (C.sub.1 to C.sub.4)haloalkyl, (C.sub.1 to C.sub.4)haloalkoxy or (C.sub.1 to C.sub.4)haloalkylthio,R.sup.3 is (C.sub.1 to C.sub.6)alkyl andm and n are 0, 1 or 2,which comprises reacting dichloromethylsilane II ##STR2## first with an arylmagnesium halide of the formula III ##STR3## where R.sup.1, R.sup.2, m, n and X are as defined in Formula I and Hal is halogen, at temperatures of from -78.degree. to 0.degree. C., and subsequently with an alkylmagnesium halide of the formula IVR.sup.3 --Mg Hal (IV),where R.sup.3 is as defined in formula I and Hal is halogen, if appropriate in the presence of a solvent.

Abstract: Aminopyrimidines of the formula (I) ##STR1## in which X and Y are in each case oxygen or sulfur andR.sup.1, R.sup.2 are independently of one another (C.sub.1 -C.sub.4)alkyl, (C.sub.1 -C.sub.4)alkoxy-(C.sub.1 -C.sub.2)alkyl or halo(C.sub.1 -C.sub.4)alkyl,are intermediates for the preparation of herbicides from the sulfonylurea group. According to the invention, compounds of the formula I can be prepared in a one-step process without pH control, which comprises the reaction of a propanediimidate of the formulaR.sup.1 X--C(.dbd.NH)--CH.sub.2 --C(.dbd.NH)--YR.sup.2or its salt with an alkali metal or alkaline earth metal salt of the cyanamide, in which a solution of the compounds in an alcohol of the formula R.sup.4 --OH, in which R.sup.4 is (C.sub.1 -C.sub.6)alkyl, or, simultaneously, separate solutions of the compounds in each case in an alcohol R.sup.4 --OH are added to an inert organic solvent which is higher-boiling in comparison to the alcohol at temperatures above 100.degree. C.

Abstract: The invention relates to a gentle process for the separation of enol ethers from mixtures containing water-soluble alcohols by extraction, wherein an aqueous solution of a base is used as the extraction agent in a phase ratio of the amounts of the aqueous phase: enol ether/alcohol mixture of at least 0.5:1 and the extraction is carried out in several stages or continuously with a theoretical number of stages of at least two. The process is particularly suitable for separating off enol ethers which readily decompose during distillation.

Abstract: The invention relates to a process for the preparation of compounds of the formula I ##STR1## in which X and Y denote O or S; R.sup.1 and R.sup.2 denote (substituted) alkyl, R.sup.3 denotes H or a --COR.sup.4 radical in which R.sup.4 is alkyl, halogenoalkyl, alkoxy, halogenoalkoxy, (substituted) phenyl or (substituted) phenoxy, wherein a propanediimidate of the formula II ##STR2## or a salt thereof is reacted, in an inert solvent and in the presence of a base, with a carbonic acid imine derivative of the formula III ##STR3## in which R.sup.5 denotes halogen, alkoxy, alkylthio, phenoxy or phenylthio.

Abstract: Process for the preparation of aminopyrimidinesPyrimidines of the formula I ##STR1## in which X and Y denote oxygen or sulfur and R.sup.1 and R.sup.2 denote C.sub.1 -C.sub.4 -alkyl, (C.sub.1 -C.sub.4 -alkoxy)-C.sub.1 -C.sub.2 -alkyl or halo-C.sub.1 -C.sub.4 -alkyl, are obtained through reaction of propanediimidates of the formula II ##STR2## or salts thereof with cyanurates of the formula R.sup.3 --O--CN in which R.sup.3 denotes C.sub.1 -C.sub.4 -alkyl, phenyl, phenyl which is substituted by 1, 2 or 3 radicals from the series comprising halogen, C.sub.1 -C.sub.4 -alkoxy and C.sub.1 -C.sub.4 -alkyl radicals, .alpha.- or .beta.-naphthyl or halo-C.sub.1 -C.sub.4 -alkyl, in an organic solvent which is inert under the reaction conditions. The one-step process permits efficient preparation of the compounds of the formula I, which can be used as intermediates for the preparation of herbicidal sulfonylureas.

Abstract: Process for the preparation of pyrimidines Pyrimidines of the formula I ##STR1## in which X and Y, independently of one another, denote oxygen or sulfur, R.sup.1 and R.sup.2, independently of one another, denote (C.sub.1 --C.sub.4) alkyl, (C.sub.1 --C.sub.4 -alkoxy)-C.sub.1 --C.sub.2 -alkyl or halo-C.sub.1 --C.sub.4 -alkyl, and R.sup.3 denotes C.sub.1 --C.sub.4 -alkyl, phenyl or phenoxy which may both be substituted by one, two or three radicals from the series comprising halogen, C.sub.1 --C.sub.4 -alkoxy and C.sub.1 --C.sub.4 -alkyl radicals, halo-C.sub.1 --C.sub.4 -alkyl or C.sub.1 --C.sub.4 -alkoxy, are obtained in a process in which propanediimidates of the formula II ##STR2## or salt thereof, are reacted with N-cyanoamides of the formula NC--NR.sup.4 --CO--R.sup.3 in which R.sup.4 denotes hydrogen or a cation, in an inert solvent. The compounds of the formula I are suitable as intermediates for the preparation of herbicidal sulfonylureas.

Abstract: A highly selective, inexpensive and quantitative process is described for the preparation of 5-phenylsulfinyl-1H-2-(methoxycarbonylamino)-benzimidazole (oxfendazole) through reaction of 5-phenylmercapto-1H-2-(methoxycarbonylamino)-benzimidazole with hydrogen peroxide in the presence of one or more aliphatic C.sub.1 -C.sub.6 -alcohols with addition of a strong, nonoxidizing mineral acid.

Abstract: The invention relates to a new process for the preparation of compounds of the formula (I) ##STR1## in which R.sub.1 denotes alkyl and R.sub.2 denotes H, acetyl or propionyl, by addition of compounds of the formula II ##STR2## onto compounds of the formula III, using radical-formers, the radical-formers being used being compounds of the general formula IV ##STR3## in which R.sub.3 denotes alkyl or phenyl and R.sub.4 denotes alkyl, the reaction being carried out at temperatures in the range from 50.degree. to 100.degree. C., and, for the preparation of compounds of the formula I where R.sub.2 is H, then splitting off the radical R.sub.2.sup.'. Using this process, the compounds of the formula I are obtained in high yield and particular purity.