4-Piperidine acetamides

A compound of the formula I ##SPC15##

• wherein
• Y is straight- or branched alkyl having from 1 to 12 carbon atoms, alkenyl having from 3 to 12 carbon atoms, benzyl, .alpha.-methyl-benzyl, p-methyl benzyl, .alpha., p-dimethylbenzyl, .alpha.-napthylmethyl, 2-phenyl- 2-hydroxyethyl or a group R.sub.7 -CH OH-CH.sub.2 - wherein R.sub.7 is hydrogen, alkyl having from 12 to 4 carbon atoms or phenyl.
• R.sub.1 and R.sub.2 are the same or different and each is straight- or branched alkyl having from 1 to 12 carbon atoms or R.sub.1 and R.sub.2, together with the carbon atom to which they are attached, form a cycloalkyl group having from 5 to 12 carbon atoms.
• R.sub.3 and R.sub.5 are independently hydrogen, straight-or branched alkyl having from 1 to 4 carbon atoms, benzyl, .alpha.-methyl benzyl, .alpha., p- dimethylbenzyl or a cycloalkyl group having 5 or 6 carbon atoms.
• R.sub.4 is hydrogen, a hydrocarbyl group having from 1 to 20 carbon atoms and being either unsubstituted or substituted by halogen or interrupted by one or more oxygen or sulphur atoms or a salt of the amine function of a compound of formula I said salt being selected from the phosphate, carbonate, sulphate, chloride, acetate, stearate, malonate, citrate, tartrate or oxalate salt.