摘要:
The present invention relates to dichloromaleic acid diamides of the formula ##STR1## in which R represents an optionally substituted aliphatic radical with up to 8 carbon atoms, a cycloalkyl radical with 3 to 6 carbon atoms or a substituted phenyl radical which possess fungicidal properties and are produced by reacting a dichloromaleic acid halide of the formula ##STR2## in which X is halogen with an amine of the formulaH.sub.2 N--Rin a diluent and in the presence of an acid-binding agent.
摘要:
A process for the preparation of a sulfonic acid chloride of the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are identical or different and denote hydrogen, a lower alkyl or cycloalkyl radical, halogen, aryl, aralkyl, aryl-ether or one of the radicals ##STR2## or where ADJACENT RADICALS R.sup.1 and R.sup.2 are linked to form a cycloaliphatic or aromatic carbocyclic ring which is optionally substituted by a sulfonic acid chloride groupWhich comprises contacting an aromatic compound of the formula ##STR3## wherein R.sup.1, R.sup.2 and R.sup.3 have the previously assigned significanceWith an approximately equimolar amount of a sulfonating agent, based upon the number of sulfonic acid chloride groups to be introduced and an excess of thionyl chloride, the sulfonating agent and thionyl chloride being initially introduced or added simultaneously with the addition of said aromatic compound.
摘要:
Cyclopropanecarboxamide can be prepared by reaction of a cyclopropanecarboxylic ester with NH.sub.3, in which the ester alcohol has 4-8 C atoms and can be straight-chain or branched and which process is carried out in the presence of catalytic amounts of an alkali metal alcoholate of a monohydric C.sub.1-C.sub.8 alcohol at 60.degree.-200.degree. C. in the absence of a hydrocarbon solvent.
摘要:
.beta.-Amino-acrylic acid esters of the formula(R.sup.1 R.sup.2)NCH.dbd.CR.sup.3 --COOR.sup.4can be obtained by reaction of .beta.-hydroxy-acrylic acid ester alkali metal salts of the formulaMe.sup..sym. .crclbar. OCH.dbd.CR.sup.3 --COOR.sup.4with ammonium salts of the formula(R.sup.1 R.sup.2) NH.sub.2.sup..sym. .crclbar.according to the general reaction equation(R.sup.1 R.sup.2) NH.sub.2 X+MeOCH.dbd.CR.sup.3 --COOR.sup.4 .fwdarw.(R.sup.1 R.sup.2) NCH.dbd.CR.sup.3 --COOR.sup.4 +MeX.dbd.H.sub.2 OR.sup.1, R.sup.2, R.sup.3, R.sup.4, Me.sup..sym. and X.sup..crclbar. having the meaning indicated in the description and the reaction being carried out in an aprotic organic solvent, in which the reaction components are suspended, as the reaction medium and it being possible to replace a part of the aprotic organic solvent by a protic organic solvent which is miscible with the aprotic solvent to give a homogeneous phase.
摘要:
The characteristic of the improved process for the preparation of 1,5-dihydroxynaphthalene and 1,5-diaminonaphthalene is to carry out the alkaline pressure hydrolysis of the disodium salt of naphthalene-1,5-disulphonic acid at temperatures from 270.degree. to 290.degree. C. and under 14 to 20 bar using an excess of sodium hydroxide solution such that the molar ratio NaOH/disodium salt of naphthalenesulphonic acid is at least 12:1. The 1,5-dihydroxynaphthalene which is obtained in this manner, without hazard and in substantially higher purity, is then aminated with ammonia in the presence of ammonium bisulphite to give 1,5-diaminonaphthalene, it being possible to achieve a further increase in the degree of purity of the 1,5-diaminonaphthalene by increasing the molar ratio NH.sub.3 /1,5-dihydroxynaphthalene to at least 6:1.
摘要:
New process for the preparation of 1-aminonaphthalene-2,4,7-trisulphonic acid and, if appropriate, 1,7-Cleve's acid, in which 1-nitronaphthalene is reacted by the Piria method with bisulphites in a manner which is known per se, the sulphamate mixture obtained in this Piria reaction is sulphonated with sulphur trioxide in sulphuric acid to give 1-aminonaphthalene-2,4,7-trisulphonic acid and, if appropriate, this is hydrolysed to 1,7-Cleve's acid by heating in aqueous sulphuric acid.
摘要:
The invention relates to a new process for the preparation of 1-aminonaphthalene-2,4,7-trisulphonic acid and 1-aminonaphthalene-7-sulphonic acid (1,7-Cleve's acid), in which 1-aminonaphthalene or naphthionic acid is sulphonated selectively in the presence of certain additives to give 1-aminonaphthalene-2,4,7-trisulphonic acid and this is hydrolyzed to 1,7-Cleve's acid by warming in aqueous sulphuric acid.
摘要:
P-Toluidine-2-sulphonic acid (5-amino-2-methylbenzenesulphonic acid) is obtained in very pure form and virtually free of p-toluidine-3-sulphonic acid (2-amino-5-methylbenzenesulphonic acid) by reacting p-toluidine at 10.degree.-55.degree. C. with oleum in sulphuric acid. The molar ratio of SO.sub.3 to p-toluidine in this reaction is 1-3.0:1. The reaction mixture is worked up by pouring into water and filtering off the precipitated p-toluidine-2-sulphonic acid.
摘要:
The invention relates to a process for the preparation of 1-amino-8-naphthol-4,6-disulphonic acid (K-acid) as the mono-alkali metal salt by reacting a mixture of naphthylaminetrisulphonic acids and/or salts thereof with an alkali metal salt solution and separating the K-acid as the mono-alkali metal salt, by acidification and crystallization. The product is a known valuable dyestuff intermediate.
摘要:
Novel 5-acyloxy-4(5H)-oxazolonium salts of the formula ##STR1## in which R.sup.1 represents an optionally substituted aliphatic group with up to 12 carbon atoms, an optionally substituted cycloalkyl group with 3 to 10 carbon atoms, an optionally substituted phenyl or naphthyl group or an optionally substituted heterocyclic group andR.sup.2 and R.sup.3 are identical or different and represent a hydrogen atom or an optionally substituted aliphatic group with up to 8 carbon atoms or an optionally substituted phenyl group andX.sup..crclbar. represents the anion of an inorganic or organic acid having a pK.sub.a value of less than 2,are obtained in solution when an acyl cyanide of the general formulaR.sup.1 --CO--CN (II)is reacted with a carboxylic acid anhydride of the general formulaR.sup.2 --CO--O--CO--R.sup.3 (III)whereinR.sup.1, R.sup.2 and R.sup.3 each have the abovementioned meaning,in the presence of one or more inorganic or organic acids having a pK.sub.a value of less than 2, and if appropriate in the presence of a solvent, and if appropriate at a temperature between 0.degree. and 120.degree. C.The novel oxazolonium salts (I) can be used as intermediate products for the preparation of known, herbicidally active 3,4,6-trisubstituted 1,2,4-triazin-5(4H)-ones.