Bayer Aktiengesellschaft

Manfred Lenthe

Gerhard Buttner

Udo Allenbach

Karl-Friedrich Christmann

Gerhard Dankert

Kurt Findeisen

Hans-Helmut Schwarz

Hans Kratzer

Andreas Gunther

James R Malone

Artur Judat

Hans-Walter Hohl

In the preparation of a 2-arylamino-4,6-dichloro-s-triazine of the formula ##STR1## in which R.sup.1 is an optionally substituted aryl radical, and

Process for the preparation of 2-arylamino-4,6-dichloro-s-triazines

A process for the isolation of a dihydroxybenzenemonoether from a reaction mixture containing solvent, ether and unreacted dihydroxybenzene, comprising contacting the reaction mixture with at least one hydrocarbon which is not miscible or only partially miscible with the reaction mixture, the ether selectively entering the hydrocarbon. Advantageously the reaction for the preparation of the monoether is carried out in an alcohol, a ketone, a dipolar aprotic solvent or a polyhydroxyalkyl ether, or a mixture thereof with water, the hydrocarbon used as extracting agent has a boiling point between about 80.degree. and 300.degree. C., and the extraction is carried out in the presence of water whereby there is an increase in the selectivity of the extraction.

Process for the isolation of 2,2-dimethyl-7-hydroxy-coumaran

A process for the isolation of a dihydroxybenzene-monoether from a reaction mixture containing solvent, ether and unreacted dihydroxybenzene, comprising contacting the reaction mixture with at least one hydrocarbon which is not miscible or only partially miscible with the reaction mixture, the ether selectively entering the hydrocarbon. Advantageously the reaction for the preparation of the monoether is carried out in an alcohol, a ketone, a dipolar aprotic solvent or a polyhydroxyalkyl ether, or a mixture thereof with water, the hydrocarbon used as extracting agent has a boiling point between about 80.degree. and 300.degree. C., and the extraction is carried out in the presence of water whereby there is an increase in the selectivity of the extraction.

Isolation of dihydroxybenzene-monoethers from reaction mixtures

A process for the preparation of a monoalkyl ether of a hydroxyphenol of the formula ##STR1## in which Z each independently is hydrogen or a substituent which is stable under the reaction conditions,

Preparation of monoalkyl ethers of hydroxyphenols

This invention relates to a new process for the preparation of acyl cyanides of the general formula

Process for the preparation of acyl cyanide compounds

In the preparation of a 7-hydroxycoumaran of the formula ##STR1## in which Z is a hydrogen atom or a substituent which is inert under the subsequent reaction conditions,

Preparation of certain 2-methyl-2,3-dihydro-benzofuran-7-ols

In the preparation of chlorinated N-methyl-imidazoles and N-methyl-imidazolines of the formula ##STR1## in which n represents the number 0, 1, 2 or 3 and

Preparation of chlorinated N-methyl-imidazoles and N-methyl-imidazolines

A process for the preparation of 3,4-dichlorobenzotrichloride, 3,4,5-trichlorobenzotrichloride, 2,4,5-trichlorobenzotrichloride or 2,3,4,5-tetrachlorobenzotrichloride which comprises contacting p-chlorobenzotrichloride of the formula ##STR1## with chlorine or an agent which releases chlorine at a temperature between 0.degree. C. and 180.degree. C. in the presence of an iron (III) chloride or aluminum chloride catalyst or a mixture of iron (III) chloride or aluminum chloride with sulfur dichloride or disulfur dichloride.

Process for the preparation of certain nuclear chlorinated

In the recovery of N,N-dimethylaminoacetonitrile from a mixture thereof with water by extraction with an organic solvent thereby to form an aqueous phase and an organic solvent phase containing the nitrile, separating the organic phase, and recovering the nitrile from the organic solvent, the improvement which comprises employing 1,2-dichlorobenzene as the organic solvent. Recovery of the nitrile from the organic solvent can be accomplished by distilling of the nitrile, the undistilled solvent being recycled for further use.

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Odenthal, Germany

Manfred Lenthe