摘要:
Abstract1H NMR Parameters are reported for five 1,4‐dithiepan‐6‐ones. 1,4‐Dithiepan‐6‐one 1‐oxide exists in solution as an equilibrium involving two different twist‐chair conformations, which contrasts with its conformational behaviour in the solid state. Twist‐chair conformers are also adopted by other members of the series, the favoured form varying with ring substitution. The SO bond in 1,4‐dithiepan‐6‐one 1‐oxide and in its 5,5‐dimethyl analogue exhibit a preference for the pseudoaxial site.