| 摘要 |
2,2-Difluoro-1,3-dioxane and 2,2-difluoro-1,3-dioxolane compounds (I), with condensed ring, are new. 2,2-Difluoro-1,3-dioxane and 2,2-difluoro-1,3-dioxolane compounds of formula (I), with condensed rings, are new. R<1>-(A<1>-Z<1>)m-A<2>-Z<2>-W (I) W = a condensed ring system of formula (IIA), (IIB) or (IIC). The full definitions are given in the DEFINITIONS (Full Definitions) Field. Independent claims are also included for: (a) new 1,3-dioxan-2-thiones and 1,3-dioxolan-2-thiones (III); (b) liquid crystal (LC) media containing >= 2 LC compounds, including compound(s) (I); and (c) electro-optical displays containing an LC medium of this type.
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