The invention comprises esters of the general formula wherein R is 1-phenyl-cyclopentyl, 1-phenyl-cyclohexyl, 4-phenyl-4-tetrahydropyranyl, 1-phenyl-cyclopropyl, diphenylmethyl, phenyl-cyclohexyl - methyl, phenyl - (2 - thenyl)-methyl, phenyl - furfuryl - methyl, or 1-(alpha - cyclohexyl - p - methoxybenzyl) - 4-piperazinyl, and their hydrochlorides and acid citrates; and their preparation by esterification of 2 - (21 - diethylaminoethoxy) - ethanol with either the appropriate carboxylic acid halide RCOHal, with or without the use of a hydrogen chloride acceptor, or the methyl or ethyl ester of the appropriate carboxylic acid RCOOH. It is stated that other methods of esterification may be used. Salts are prepared by reacting the esters with either hydrogen chloride or citric acid in a medium such as ether or acetone. In examples, which describe the preparation of all of the above esters, the first of the above esterification methods is carried out in boiling toluene or boiling pyridine and the second by adding sodium to the reaction components of which the amino alcohol is in excess and distilling off the methanol or ethanol formed together with the excess amino alcohol. The products are useful as spasmolytics. Methyl-phenyl-furfuryl-acetate is obtained from furfuryl chloride and the sodium salt of phenyl acetonitrile followed by saponification of the phenyl-furfuryl-acetonitrile and esterification of the carboxyl group with excess of diazomethane in an ethereal medium. Ethyl - 1 - (alpha - cyclohexyl - p - methoxybenzyl) - 4 - piperazine - carboxylate is obtained from monocarbethoxy-piperazine and alphacyclohexyl-p-methoxy benzyl chloride.