Abstract: The invention relates to compounds of the formula (I) in which R represents a radical (CH2)mOn(X)YAr  in which m represents the number 0 or 1, n represents the number 0 or 1, X represents a radical (NH)a, CH2 or SO2, where a represents the number 0 or 1, Y represents a radical (CH2)b—(CH═CH)c—(CH2)d, where c=0 or 1 and b+c+d ≦8, Z represents a hydrogen or halogen atom, Ar represents an optionally substituted aryl or heteroaryl radical and W represents a hydrogen atom or an acyl radical, and their acid addition salts. The compounds of the formula (1) have antibiotic properties.

Abstract: A process for the preparation of a compound of the formula ##STR1## wherein alk.sub.1 and alk.sub.2 are individually alkyl of 1 to 8 carbon atoms comprising reacting a compound of the formula ##STR2## with a dehydrating agent to obtain the corresponding compound of formula I.

Abstract: A compound in all possible racemic and optically active forms of the formula ##STR1## wherein .dbd.X is .dbd.O or imino having antiandrogenic activity and novel intermediates and processes for their preparations.

Abstract: A novel process for the resolution of D,L-cis and D,L-trans 2,2-dimethyl-3-(2,2 -dihalovinyl)-cyclopropane-1-carboxylic acids of the formula ##STR1## wherein X is selected from the group consisting of fluorine, chlorine and bromine comprising salifying the said acid with an optically active base selected from the group consisting of D-ephedrine, L-ephedrine, D-N-methyl-ephedrine, L-N-methylephedrine, D-pseudo-ephedrine and L-pseudo-ephedrine to form the corresponding salt, recovering the said salt and subjecting the latter to acid hydrolysis to obtain the corresponding resolved acid which are intermediates for the synthesis of esters having a remarkable insecticidal activity.