Influence of the Position of Ring Unsaturation in Steroids and Triterpenes on the Type and Formation of Mesophases II: Influence of the Δ7-Double Bond

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Abstract
Several sterols and triterpenes possessing a Δ7-double bond were investigated for mesomorphic behavior. The acetates and palmitates of cholesta-5, 7-dien-3β-ol and cholest-7-en-3β-ol, exhibited distinct smectic mesophases only. The acetates of 4,4,14α-trimethylcholest-7-en-3β-ol and 4,4-dimethylcholest-7-en-3β-ol showed no mesomorphism while the palmitate of the latter gave a smectic mesophase. The Δ7-double bond seems in general to favor the formation of smectic rather than cholesteric mesophases.