Abstract: A 1,7-diacetylpyrazolotriazole was prepared by acid catalyzed acetylation of 6-methyl-3-[3-(4-nitrophenyl)propyl]-1H-pyrazolo[5,1-C]-1,2,4-triazole. Hydrolysis gave the 7-acetylpyrazolotriazole. Oxidation converted the 7-acetylpyrazolotriazole to a 7-acetoxypyrazolotriazole.

Abstract: A 1,7-diacetylpyrazolotriazole was prepared by acid catalyzed acetylation of 6-methyl-3-[3-(4-nitrophenyl)propyl]-1H-pyrazolo[5,1-C]-1,2,4-triazole. Hydrolysis gave the 7-acetylpyrazolotriazole. Oxidation converted the 7-acetylpyrazolotriazole to a 7-acetoxypyrazolotriazole.

Abstract: Novel 2-pyrimidyl alkanesulfonates are prepared by reacting a 2-hydroxypyrimidine acid salt with an alkanesulfonyl chloride in the presence of an acid acceptor. The novel 2-pyrimidyl alkanesulfonates are advantageously employed to prepare 1-(cyanoalkyl)-4-(2-pyrimidyl)piperazines by reacting them with a novel 1-(cyanoalkyl)piperazine in the presence of an acid acceptor.

Abstract: Novel 1-(cyanoalkyl)-4-guanylpiperazine acid salts are prepared by reacting novel 1-(cyanoalkyl)piperazines with cyanamide in the presence of an acid. The novel 1-(cyanoalkyl)-4-guanylpiperazine acid salts are advantageously employed to prepare 1-(cyanoalkyl)-4-(2-pyrimidyl)piperazines by reacting them with malonaldehyde in an acidic medium.

Abstract: Novel cyanoalkylpiperazines are prepared by reacting piperazine with a haloalkylnitrile in the presence of an acid acceptor. The novel cyanoalkylpiperazines are advantageously employed to prepare 1-(cyanoalkyl)-4-(2-pyrimidyl)piperazines by reacting them with halopyrimidines in the presence of an acid acceptor.

Abstract: A method for preparing a 1-aryl-3-arylamino-2-pyrazolin-5-one comprises reacting an N-aryl-3-arylamino-3-oximinopropionamide with an acylating agent in an inert solvent, then heating in contact with a strong acid catalyst and a dehydrating agent in an inert solvent, and then heating in contact with an acid in water and a lower alkanol.

Abstract: A method for preparing 2-pyrazolin-5-ones from 1,2,4-oxadiazoles is described. The method comprises forming a liquid reaction system of a base catalyst and a 1,2,4-oxadiazole in an organic liquid reaction medium and heating the reaction system to a temperature sufficient to cause the 1,2,4-oxadiazole to be rearranged to a 2-pyrazolin-5-one.

Abstract: Disclosed is a process for the preparation of certain 1-aryl-3-amino-5-pyrazolones by reacting a 3-nitropropionic acid ester with certain aryldiazonium salts to produce intermediate .alpha.-nitrohydrazones and then reducing the intermediate to give the corresponding aminopyrazolones. The aryl group may be, for example, phenyl, 4-methoxyphenyl, or the like, the diazo anion can be, e.g., Br.sup.-, Cl.sup.-, BF.sub.4.sup.-, or SO.sub.4.sup..dbd., and the ester alcohol moiety can be any convenient, unreactive group, preferably alkyl. The aminopyrazolones are useful for the preparation of photographic couplers.