chromanones, the t-butylgroup exists mainly in the quasi-axial position, while the phenyl group is still in the quasi-equatorial environment. The preferred conformations of the isopropyl, and of the t-butylgroup in cis- and trans-2-substituted chromanols, are equatorial, whereas trans-3-t-butylchromanol and its benzoate exist mainly as the conformations in which the t-butylgroup is in the axial position