Labelled compounds of potential biological interest VI. Preparation of some labelled local anaesthetic aminoethers

2′-(2-Diisopropylaminoethoxy)-butyrophenone (ketocaine) and 1-butoxy-2-(2-diisopropylaminoethoxy)-benzene show a good anaesthetic effect on topical application. The synthesis of both of these compounds specifically labelled with 14C is described. The preparation of ketocaine generally labelled with tritium and specifically labelled with deuterium is also reported.