Abstract: A compound which is a 2-aminoalkyl-5-arylalkyl-1,3-dioxane of general formula (I) ##STR1## in which m represents 0 or 1;n represents 1, 2, 3 or 4;R.sub.1 represents hydrogen or methyl;R.sub.2 represents hydrogen, methyl or an alkanoyl group of the general formula COR' in which R' represents a hydrogen atom or a linear or branched C.sub.1 -C.sub.4 -alkyl group, or an alkoxycarbonyl group of the general formula COOR" in which R" represents a linear or branched C.sub.1 -C.sub.4 -alkyl group; and Ar represents either a phenyl group optionally carrying one or two substituents selected from halogen, C.sub.1 -C.sub.4 alkyl, methoxy and trifluoromethyl, or a naphthalen-1-yl or naphthalen-2-yl group optionally carrying a substituent selected from halogen, methyl, methoxy and cyclopropylmethoxy groups,in the form of a cis- or trans-stereoisomer, and in the form of a free base or an acid addition salt thereof and its therapeutic use.

Abstract: Diphenylazomethine derivatives of formula (I) ##STR1## wherein R.sub.1 is hydrogen or methyl and R.sub.2 is an --OH,--OM (M=alkaline metal or alkaline earth metal), --NH.sub.2 or --O(C.sub.1-4 alkyl) group, and which are in the form of cis or trans isomers or mixtures thereof, have central nervous system activity and can be used as antidepressants and anticonvulsants.

Abstract: Process for preparing diphenylazomethines of formula (II) ##STR1## by decarboxylation of diphenylazomethines of formula (I) ##STR2## in which X.sub.1 and X.sub.2 each denote, independently of each other, a hydrogen atom or a halogen atom or a methyl radical,R.sub.1 is H or linear or branched (C.sub.1-4) alkyl radical,R.sub.2 is the radical COOH, a linear or branched (C.sub.1-4) alkyl radical, the radical CONH.sub.2 or a linear or branched COO(C.sub.1-4) alkyl radical, andR.sub.3 denotes a hydrogen atom or the methyl radical.

Abstract: Benzylidene derivatives of the formula: ##STR1## in which each of X.sub.1, X.sub.2, X.sub.3 and X.sub.4 independently of one another represents hydrogen, halogen, a linear or branched alkyl radical of 1 to 4 carbon atoms, CF.sub.3, NO.sub.2, phenyl, methoxy, or amino, at least two of the substituents X.sub.1, X.sub.2, X.sub.3 and X.sub.4 being different from hydrogen, and R represents a linear or branched alkyl radical of 1 to 16 carbon atoms or an alkenyl radical of 2 to 8 carbon atoms, which may be produced by reaction of the corresponding ketones with an amine, are active on the central nervous system, especially as anti-convulsants.

Abstract: Benzylidene derivatives of the formula: ##STR1## in which each of X.sub.1, X.sub.2, X.sub.3 and X.sub.4 independently of one another represents hydrogen, halogen, a linear or branched alkyl radical of 1 to 4 carbon atoms, CF.sub.3, NO.sub.2, phenyl, methoxy, or amino, at least two of the substituents X.sub.1, X.sub.2, X.sub.3 and X.sub.4 being different from hydrogen, and R represents a linear or branched alkyl radical of 1 to 16 carbon atoms or an alkenyl radical of 2 to 8 carbon atoms, which may be produced by reaction of the corresponding ketones with an amine, are active on the central nervous system, especially as anti-convulsants.