摘要:
The instant invention is directed to a process for the production of an aromatic isocyanate containing aromatically bound sulfochloride groups, comprising:(I) reacting(a) an isocyanate or carbamic acid chloride which contains at least one aromatically bound isocyanate group and/or at least one aromatically bound carbamic acid chloride group, successively or simultaneously at 0.degree. to 170.degree. C. with(b) a sulfonating agent and(c) an organic compound containing at least one aromatically bound trihalo methyl group and(II) removing hydrogen chloride from the reaction mixture at 20.degree. to 170.degree. C.
摘要:
A process for the simultaneous preparation of an aromatic sulphonic acid halide and an aromatic carboxylic acid halide or the corresponding carboxylic acid is disclosed wherein an aromatic sulphonic acid or acid anhydride is reacted with an aromatic trihalogenomethyl compound in the presence of a Bronsted acid or Lewis acid at a temperature of 20.degree. to 300.degree. C., if appropriate in the presence of a solvent. Generally, at least half an equivalent of aromatic trihalogenomethyl compound is employed per equivalent of sulphonic acid.
摘要:
Acid halides of the formula (R.sup.1, R.sup.2, R.sup.3)C--CO--Hal are obtained by reacting alkyl halides of the formula (R.sup.1, R.sup.2, R.sup.3)C--Hal with carbon monoxide under a pressure of 5 to 1,000 bar and at a temperature of -20.degree. C. to +100.degree. C. in the presence of 0.001 to 0.3 mol of AlCl.sub.3 and/or FeCl.sub.3, if appropriate in the presence of a further Bronsted or Lewis acid, per mol of the alkyl halide. The process is carried out, if desired in the presence of a solvent which is customary for Friedel-Crafts or Friedel-Crafts-related reactions and, if appropriate in the presence of a hydrogen halide. The acid chloride can be isolated from the reaction mixture or further reacted.
摘要:
Dialkyl carbonates can be prepared by reaction of carbon monoxide with alkyl nitrites in continuous gas phase reaction, in which a platinum metal halide catalyst on aluminum oxides, aluminum oxide hydrates or aluminum hydroxides as support and, if desired, an additive comprising an antimony, bismuth, aluminum, copper, vanadium, niobium, tantalum, tin, iron, cobalt, nickel compound or a mixture of a plurality thereof on this catalyst are used and hydrogen halide is replaced during the course of the reaction batchwise or continuously in at least the amount which is discharged from the reactor together with the reaction mixture. This results in the formation of dialkyl carbonates in almost quantitative selectivity, while the corresponding dialkyl oxalates can not in most cases be detected. The abovementioned supports are characterized by a BET surface area of more than 1 m.sup.2 /g.
摘要:
Substituted benzaldehydes are prepared by reaction of the substituted benzenes from which they are derived with carbon monoxide and hydrogen chloride in the presence of metal halides, the process being performed in the presence of 0.5 to 10 mols of hydrogen chloride per mol of metal halide at a partial pressure of carbon monoxide from 1 to 100 bars and a temperature from -20.degree. C. to +100.degree. C. and, if desired, in the presence of an inert diluent. The substituted benzaldehyde which contains, as a substituent, alkyl with at least 2 carbon atoms, cycloalkyl or optionally substituted benzyl, is prepared by reacting the appropriately substituted benzene with the additional presence of a benzene which does not contain the substituents mentioned, but which is identical in respect of further substituents which are optionally present with the benzene from which it is derived.
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:
An N-alkylated formamide of the formula ##STR1## wherein R.sup.1 denotes alkylR.sup.2 denotes alkyl with at least 9 carbon atoms or the group ##STR2## wherein A denotes straight-chain or branched alkanediyl,R.sup.1 denotes lower alkyl andn denotes an integer from 2 to 6,a process for the preparation of the same and its use in the replacement of a hydroxyl group in an organic compound by chlorine or bromine the improvement wherein the replacement is carried out in the presence of an N-alkylated formamide.
摘要:
In the preparation of 3,5-dichloro-.alpha.-methylstyrene by isopropylation of an m/p-dichlorobenzene mixture, isomerization of the resulting alkylation mixture, subsequent side chain bromination of the alkylation mixture and dehydrobromination of the resulting bromination mixture, the improvement which comprises reacting an excess of an m/p-dichlorobenzene mixture which contains at least 50% by weight of m-dichlorobenzene with isopropyl halide, isomerizing the resulting alkylation mixture under pressure in the presence of aluminum chloride until thermodynamic equilibrium has been attained, separating off the isomerized alkylation mixture from the unreacted m/p-dichlorobenzene mixture, and recycling the unreacted mixture for further reaction.
摘要:
Monomethyl-substituted methylene compounds are obtained by reacting methylene compounds of the formula ##STR1## in which R.sup.1 and R.sup.2 independently of one another represent --CN, --CO--R.sup.3, --SO.sub.2 --R.sup.3 or --NO.sub.2 andR.sup.1 can additionally denote -aryl(R.sup.1).sub.n,whereinR.sup.3 denotes --OH, alkyl, aralkyl, aryl, alkoxy, aralkoxy or aryloxy, or amino which is substituted by alkyl and/or aralkyl and/or aryl, and furthermoretwo radicals R.sup.3 together can be an alkylene group, the radical of an aliphatic diol or of an aliphatic diamine or the group --NH--CO--NH-- and n represents 1, 2 or 3,with formaldehyde and with hydrogen in the presence of a condensation catalyst and a hydrogenation catalyst at elevated temperature, the methylene compound being introduced into the liquid phase of the mixture of reactants in the course of the reaction.
摘要:
3-Nitro-acetoacetanilides of the formula ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 independently of one another represent hydrogen, alkyl, cycloalkyl or aryl, it being possible for two of the said radicals to form a cycloaliphatic ring together with the carbon atom on which they are substituents, andR.sup.4 and R.sup.5 independently of one another denote hydrogen, alkyl, aralkyl, aryl, alkoxy, alkylthio, aralkoxy, aralkylthio, aryloxy, arylthio, halogen, nitro or amino disubstituted by alkyl, aralkyl or aryl, andR.sup.4 and R.sup.5, when they are adjacent, can be parts of a fused cycloaliphatic or aromatic ring,are described as well as methods for its preparation such as by reaction of an acetoacetic acid compound with a 3-nitro-aniline under condensation conditions, or, by reaction of an enamine with 3-nitro-phenyl isocyanate. The 3-nitro-acetoacetanilides are useful intermediates in the preparation of coupling components for color photography.