The conformational analysis of saturated heterocycles. Part XLIII. 1-t-Butylpiperidine-4-spiro-2′-aziridine, -oxiran, and -thiiran
Abstract
The title compounds have been prepared and the conformational equilibria for the oxiran and thiiran (4, 5; a ⇌ b) elucidated by electric dipole moment measurements. The relative steric requirements of CH2-groups and of O- and S-atoms in three membered rings are discussed.