and propanol or the mixture thereof may be used in reaction scheme iv hx represents an acid capable of forming a pharmacologically useful salt with the basic nitrogen atom as described above representative examples of the compounds i iii and iv from scheme i ii iii and iv include the following compounds 3r 3 r naphthalen 2 yl 2h tetrazol 2 yl methyl piperidine 3s 3 s naphthalen 2 yl 2h tetrazol 2 yl methyl piperidine 3r 3 s naphthalen 2 yl 2h tetrazol 2 yl methyl piperidine 3s 3 r naphthalen 2 yl 2h tetrazol 2 yl methyl piperidine 3r 3 r naphthalen 2 yl 1h tetrazol 1 yl methyl piperidine 3s 3 s naphthalen 2 yl 1h tetrazol 1 yl methyl piperidine 3r 3 s naphthalen 2 yl 1h tetrazol 1 yl methyl piperidine 3s 3 r naphthalen 2 yl 1h tetrazol 1 yl methyl piperidine 3s 3 r 5 methyl 2h tetrazol 2 yl naphthalen 2 yl methyl piperidine 3s 3 s 5 methyl 2h tetrazol 2 yl naphthalen 2 yl methyl piperidine 3r 3 s 5 methyl 2h tetrazol 2 yl naphthalen 2 yl methyl piperidine 3r 3 r 5 methyl 2h tetrazol 2 yl naphthalen 2 yl methyl piperidine 3r 3 r naphthalen 2 yl 2h 1 2 3 triazol 2 yl methyl piperidine 3s 3 s naphthalen 2 yl 2h 1 2.