The preparation and the juvenilization effect of some derivatives of 3,7-dimethyl-9-(5-methyl-2-oxolanyl)-2,6-nonadenoic, 3,7-dimethyl-9-(5-methyl-2-oxolanyl)-2-nonenoic (methyl, ethyl and isopropyl ester, monomethyl and dimethylamide) and 3,7-dimethyl-9-(-methyl-2-oxolanyl)-2,4-nonadenoic acid (methyl, ethyl and isopropyl ester) have been described.