Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The addition of alkylzinc iodides to 1-(phenoxycarbonyl)-2,3-dihydropyridinium salts. A synthesis of 2-alkyl-Δ 3 -piperidines. ... Several 2-alkyl-1-(phenoxycarbonyl)-Δ 3 -piperidines were prepared by the addition of alkylzinc iodides to 1-(phenoxycarbonyl)-2,3-dihydropyridinium salts.