Novel ferroelectric liquid crystals and dopants for induced ferroelectric phases containing 3,4-epoxy-2-octanols as chiral unit

New monomer liquid crystals containing a chiral 2,2- or 2,3-disubstituted oxirane ring

“…), giving 22.56 g (yield 32%) of 9-6, mp 151-153 (19). A solution of 66.98 g (0.41 mol) of 1-bromohexane (16) in 300 ml of anhydrous tetrahydrofuran was added to a suspension of 9.92 g (0.41 mol) of Mg turnings in 100 ml of anhydrous tetrahydrofuran in 45 min under an inert atmosphere. The mixture was then heated to reflux for 1 h and afterwards cooled to −10 • C. 3.06 g (0.016 mol) of CuI was added and then a solution of 9.23 g (0.16 mol) of propargyl alcohol (18) in 100 ml of anhydrous tetrahydrofuran in 30 min.…”

“…A great diversity of chiral groups have been used in combination with mesogenic cores to induce chirality in liquid crystals. Comparatively little attention has been devoted to the oxirane ring as a chiral building block [9][10][11][12][13][14][15][16]. 2,3-Disubstituted and 2,2-disubstituted oxirane rings (I and II, respectively) present distinct structural features.…”

“…2,3-Disubstituted and 2,2-disubstituted oxirane rings (I and II, respectively) present distinct structural features. In fact, the conformation and steric hindrance of their polar cyclic structure comprising one or two chiral centers can affect significantly the rotational freedom around the long molecular axis, thereby possibly resulting in very different mesophase structures and properties [16].…”

Structural coloured epoxy resin patterns prepared using thermochromic epoxy liquid crystal mixtures

“…48 The synthesis and phase transition behaviour of several series of chiral epoxy liquid crystals have been studied. [49][50][51][52][53][54][55][56][57][58] However, no chiral epoxy liquid crystals have been used for the preparation of epoxy resin-based CLCN films. Herein, two pairs of epoxy liquid crystals with a cholesteric phase were synthesized, and the CLCN films with a structural colour were prepared using their mixtures.…”