Abstract: The invention relates to a process for the preparation of hydroxybenzaldehydes by oxidation of hydroxybenzylic alcohols through oxygen or oxygen-containing gas, said process being carried out in aqueous alkaline medium in the absence of any catalyst whatsoever, at a temperature comprised between 25.degree. and 50.degree. C. and in the presence of an alkaline hydroxide in such a quantity that the molar ratio of alkaline hydroxide to hydroxybenzylic alcohol used is comprised between 2.25 and 10.

Abstract: The invention relates to a process for preparation of hydroxyarylglyoxylic acids starting from hydroxyarylglycolic acids, by catalytic oxidation in an aqueous alkaline medium to pH higher than, or equal to, 11.5, through oxygen or oxygen-containing gas, characterized in that it is carried out in homogeneous phase at a temperature lower than, or equal to, 30.degree. C., and in the presence of cupric ions, and in that at the end of the reaction, the desired acid is isolated from the reactional medium through acidification to pH of about 0.5.The sodium parahydroxyphenylglyoxylate is obtained when acidification is stopped at pH=5, at the end of the reaction.

Abstract: The process for manufacturing thienyl-2 acetic acid from acetylthiophene comprises condensing acetylthiophene at a temperature below 120.degree. C. with an excess of a C.sub.4 to C.sub.8 aliphatic primary amine or with a cyclic amine, in the presence of an acid catalyst and removing the water formed, so as to obtain the corresponding imine. The imine is reacted with excess sulfur at a temperature equal to or below 100.degree. C. in a basic and aprotic solvent to produce the corresponding thioamide. The thioamide is hydrolyzed by the action of an excess of a strongly alkaline base in a C.sub.4 to C.sub.8 alcohol or in ethylene glycol, if necessary in the presence of water, so as to obtain an alkali salt of thiophene-2 acetic acid. Finally the latter is treated with a strong acid in aqueous solution to liberate the thienyl-2 acetic acid.

Abstract: A method of preparation of 6-aza uracile, comprising the steps of:A. Cyclization of semi-carbazone of glyoxylic acid by heating this latter with an excess of a trialkyl-silylation agent taken as a solvent and isolating the resulting product, namely the O-disilylated derivative of 6-aza uracile (or di-3,5 (trialkylsiloxy)1,2,4 triazine) andB. subjection of the product resulting from step a) to an acid hydrolysis.