Abstract: 2,4-Dinitrophenyl urea is obtained in a technologically simple manner with high yield, if 2,4-dinitro-1-chlorobenzene 1s reacted with cyanamide, advantageously in an excess amount, at a temperature at from about 55.degree. to 75.degree. C. to yield 2,4-dinitrophenyl cyanamide which is subsequently hydrolyzed without intermediate isolation in an aqueous acid medium at a temperature of from about 40.degree. to 75.degree. C. 2,4-Dinitrophenyl urea serves as starting compound for the preparation of 5-amino-benzimidazolones which may be employed, for example, when preparing azo compounds.

Abstract: A new process, which can be carried out on the technical scale, had been found for the preparation of 2-alkoxy-6-bromo-naphthalenes, especially suitable as starting compounds for the synthesis of estrogens, which comprises brominating 2-hydroxy-naphthalene-1-carboxylic acid with bromine, decarboxylating the 6-bromo-2-hydroxynaphthalene-1-carboxylic acid by heating the reaction mixture at 100 - 125.degree. C, and alkylating the 6-bromo-2-hydroxy-naphthalene formed. The process can be conducted easily and with high yields.

Abstract: The process for the preparation of tolutriazoles by diazotation of toluylene-o-diamines and subsequent ring closure to form the tolutriazole ring, was improved and the tolutriazoles are now obtained in a simpler way and in a pure form. The improvement comprises dissolution of the tolutriazoles without preceding isolation after their synthesis by means of an alkaline agent, preferably a sodium hydroxide solution of 20 - 33% strength, and subsequent precipitation at a pH of from 4.5 to 6 by addition of a mineral acid, preferably nitric acid or hydrochloric acid, and avoids a subsequent technically complicated and expensive purification process as well as the use of organic solvents. The tolutriazoles obtained according to this novel process are sufficiently pure for the use as corrosion inhibition.

Abstract: An improved process for the manufacture of aromatic sulfonic acid halides from aromatic diazonium compounds, wherein aromatic diazonium compounds are reacted in a strongly hydrochloric or hydrobromic solution in the presence of copper or copper compounds with an alkali metal hydrogeno-sulfite, which avoids the use of liquid or gaseous sulfur dioxide and of organic solvents according to known processes which makes the process, if carried out on a technical scale, expensive and strongly contaminates the waste water.

Abstract: A process for preparing 4-amino-2,5-di-(C.sub.1 -C.sub.4) alkoxybenzonitriles which comprises brominating 1-acylamino-2,5-dialkoxybenzenes, converting the 1-acylamino-2,5-dialkoxy-4-bromobenzenes so obtained by the reaction with copper-I-cyanide to the 4-acylamino-2,5-dialkoxy-benzonitriles and subsequently hydrolyzing the acylamino group; the known compounds are prepared by means of this process in better yields and in a technically simpler way.