New Optically Active Dopants Based on Chiral Dioxanes

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Abstract
With the exception of natural products and their derivatives, chiral dopants for ferroelectric and nematic applications with chiral rings were scarcely reported in the literature. Especially six membered rings were not investigated so far. We now report on the synthesis and physical properties of chiral dioxanes. They exhibit a medium spontaneous polarization in ferroelectric and a small helical pitch in nematic mixtures. A possibility to invert the sign of the spontaneous polarization without change of the helix sense is demonstrated. Some representatives exhibit an almost temperature independent helical pitch.