Shaving aid with physiological cooling effect

A shaving aid comprising an effective amount of a compound capable of stimulating the cold receptors of the nervous system in the surface tissues of skin when brought into contact therewith, said compound having the formula:

• ##STR6## where R.sub.1, when taken separately is H, C.sub.1 -C.sub.7, alkyl or C.sub.3 -C.sub.6 cycloalkyl;
• R.sub.2, when taken separately, is C.sub.3 -C.sub.8 alkyl or C.sub.1 -C.sub.8 aikylcycloalkyl, alkylcycloalkylalkyl, cycloalkyl or cycloalkylalkyl, with the proviso that R.sub.2 is branched at an alpha carbon atom relative to the N atom when R is H or at an alpha or beta carbon atoms when R is alkyl or cycloalkyl, this condition to be satisfied, in the case of cyclic groups, when the carbon atoms alpha or beta to the N atom is part of the cycle;
• R.sub.1 and R.sub.2, when taken together, represent a straight or branched chain alkylene group forming with the N atom to which they are attached a 5-10 membered heterocycle, and preferably having branching at an alpha or beta carbon atom relative to the N atom.
• R.sub.1 and R.sub.2, when separate groups and when taken together provide a total of at least 5 carbon atoms, and
• X represents R.sub.3 CO--, R.sub.4 SO.sub.2 --, or R.sub.5 R.sub.6 NCO-- where;
• R.sub.3 is H, C.sub.1 -C.sub.4 alkyl, C.sub.3 -C.sub.4 cycloalkyl, C.sub.2 -C.sub.4 hydroxyalkyl, C.sub.2 -C.sub.8 carboxyalkyl or C.sub.3 -C.sub.8 alkylcarboxyalkyl with the proviso that when R.sub.3 is C.sub.6 alkyl it is primary in structure;
• R.sub.4 is C.sub.1 -C.sub.6 alkyl or C.sub.3 -C.sub.6 cycloalkyl, with the proviso that when R.sub.4 is C.sub.5 or C.sub.6 alkyl it is primary in structure;
• R.sub.5 and R.sub.6, when taken separately, are each H, C.sub.1 -C.sub.6 alkyl, C.sub.3 -C.sub.6 alkylcyctoalkyl, cycloalkyl, or cycloalkylalkyl, C.sub.2 -C.sub.8 hydroxyalkyl, C.sub.2 -C.sub.8 carboxyalkyl or C.sub.3 -C.sub.8 alkylcarboxyalkyl;
• or together represent a straight or branched chain C.sub.3 -C.sub.10 alkylene group optionally containing an ether oxygen atom;
• and where:
• R.sub.1, R.sub.2 and X provide a total of from 7-16 carbon atoms.