Abstract: New piperazino derivatives of formula ##STR1## in which R is a phenyl radical substituted with at least one sulphonamido group or a substituted nitrogenated heterocyclic ring, and A is CO, CH.sub.2, SO.sub.2, possessing inhibiting activity towards carbonic anhydrase.The new products are prepared from compounds of formula R-A-X in which X is OH, SH, halogen, OR"" or SR"" in which R"" is methyl, ethyl, phenyl, carbomethoxy, carboethoxy, and from a piperazino derivative of formula ##STR2## The R' group can also be introduced on termination of the reaction, by removing and substituting a protective group present at the nitrogen.

Abstract: A process for preparing 7-chloro-5-(2-chlorophenyl)-1,3-dihydro-2H-1,4-benzodiazepin-2-one of the formula: ##STR1## utilizing 2',5-dichloro-2-aminobenzophenone, phthalimidoglycine and hydrazine in a single passage and in a single reaction medium under critical reaction conditions.

Abstract: The application describes a process for preparing 2-phenyl derivatives of benzoxazolyl propionic acid of formula ##STR1## in which X is H, Cl, Br, F, or a linear or branched alkyl or 1 to 6 carbon atoms. The process starts from 3-nitro-4-hydroxyphenyl-.alpha.-methyl-acetonitrile which is hydrolysed in the presence of a strong acid, the 3-nitro-4-hydroxyphenyl-.alpha.-methylacetic acid thus obtained is hydrogenated in the presence of Pd on carbon, and the 3-amino-4-hydroxyphenyl-.alpha.-methylacetic acid deriving therefrom is first reacted with benzoyl chloride or with para-substituted benzoyl chloride in the presence of an alkaline base, and then with 85% phosphoric acid to complete the formation of the oxazolinic ring.