Abstract: The a'lithiations and subsequent electrophilic substitutions of two series of piperidides are reported. In the cases of 2, 4, 6-triisopropylbenzopiperidide (5) and 4-tert- butyl-2, 4, 6-triisopropylbenzopiperidide (6) lithiations and electrophilic substitutions give a'- substituted products, as shown in Table I, which cannot be cleaved. 2, 2- Diethylbutanopiperidide (19), 4-phenyl-2, 2-diethylbutanopiperidide (20), and N, N-diethyl ...