Mixtures of monomers and liquid crystals, composite materials of polymers and liquid crystals, and liquid crystal elements
A mixture, liquid crystal technology, applied in liquid crystal materials, optics, instruments, etc., can solve the problem of uneven concentration
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[0206] Preparation of compound (2-1)
[0207]
[0208] A base is used to etherify a phenol derivative and a halogen derivative, and an appropriate formyl chloride is allowed to act on the obtained compound to obtain the target compound.
[0209] In the formula, R a It has the meaning given by formula (2-1), and n is 1-30.
[0210] Preparation of compound (2-2)
[0211]
[0212] Hydrogen reduction is performed using a catalyst such as palladium in a compound obtained by acting on a Wittig reagent corresponding to a derivative of benzaldehyde. Next, an alcohol derivative is obtained by allowing a reducing agent such as LAH to act on the aldehyde derivative obtained by deprotecting the protecting group. Finally, the desired compound can be obtained by reacting the alcohol derivative with an appropriate formyl chloride.
[0213] In the formula, R a It has the meaning given by formula (2-2), and n is 1-30.
[0214] Preparation of compound (2-3)
[0215]
[0216] ...
example
[0281] Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited by these examples.
[0282] In the examples of this specification, I represents the non-liquid crystal isotropic phase, N represents the nematic phase, and N * Indicates a chiral nematic phase, BP indicates a blue phase, and BPX indicates an optically isotropic liquid crystal phase in which diffracted light of two or more colors is not observed. In this specification, the I-N phase transition point is sometimes referred to as the N-I point. sometimes I-N * The phase transition point is called N * -I point. The I-BP phase transition point is sometimes referred to as the BP-I point.
[0283] Synthesis examples of monofunctional monomers used in the present invention are shown below.
example 1
[0284] Example 1: Synthesis of 8-(4-pentylphenoxy)-octyl acrylate
[0285]
[0286] 4-amylphenol (24.3g, 148.2mmol) was dissolved in dimethylformamide (Dimethylformamide, DMF) (100ml), then 8-chlorooctyl alcohol (24.4g, 148.2mmol), potassium carbonate (41.0g , 296.4mmol), and heated and stirred at 80° C. for 30 hours under a nitrogen atmosphere. After completion of the reaction, water was added to further make the solution acidic, and then toluene was added for extraction. After washing with water and a saturated aqueous sodium chloride solution, it was dried over anhydrous magnesium sulfate, and the solvent was concentrated under reduced pressure. Purification was carried out by silica gel column chromatography to obtain compound (S-01) (28.3 g, 65%).
[0287] Compound (S-01) (15.0 g, 51.3 mmol) was dissolved in tetrahydrofuran (THF) (130 ml), and then triethylamine (8.6 ml, 61.6 mmol) was added. After cooling to 0°C, acryloyl chloride (5.0ml, 61.6mmol) was added dropwi...
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