2-6b 強誘電性液晶ドーパント、光学活性2,4-二置換γ-ブチロラクトンの合成と物性

概要

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Syntheses and properties of optically active 2,4-disubstituted γ-butyrolactones having a different number of methylene chain between a core and a γ-butyrolactone ring, cis-1 - 4, trans-1 - 4, 5, and endo-6 - 8, which are developed for ferroelectric liquid crystals (FLCs) are described. The γ-butyrolactones cis-1 - 4 were synthesized in a stereoselective manner via a Pd-C catalyzed hydrogenation of the endo CC double bond isomers of (4R)-2,4-disubstituted γ-butyrolactone, 5, and endo-6 - 8, respectively. The syntheses of trans-γ-butyrolactones were performed via addition reaction of thiophenol to the endo-α,β-unsaturated γ-butyrolactones as a key step to produce trans-3 and 4 with a moderate stereoselectivity. Properties of FLC mixtures containing the γ-butyrolactones as chiral dopants were estimated. The relationship between the FLC properties and molecular structures of the γ-butyrolactones are discussed.
日本液晶学会の論文
1998-10-12