OPTICALLY ACTIVE TETRAHYDROPYRAN DERIVATIVE, AND LIQUID CRYSTAL COMPOSITION AND LIQUID CRYSTAL ELEMENT BOTH CONTAINING THE SAME.

摘要

A novel optically active tetrahydropyran derivative useful as the liquid crystal material of a display element or an electro-optical element, represented by general formula (I), or general formula (I') (wherein each symbol is as defined in the specification) such as (2R, 5R, 6R)-tetrahydro-6-trifluoromethyl-2-hexyloxy-5-(4''-hexyloxybiphenyl-4' -carbonyloxy)pyran or (2R, 5R, 6R)-tetrahydro-6-trifluoromethyl-2-hexyloxy-5-(4''-hexyloxybiphenyl-4' -carbonyloxy)pyran, and a liquid crystal composition and a liquid crystal element containing the same. The derivative can be improved, especially when formulated into a composition, in rapid response characteristics and is useful as an ingredient of a ferroelectric liquid crystal which induces a large spontaneous polarization.