d-a-d bow-shaped Bola (bola) liquid crystal compound
A liquid crystal compound, D-A-D technology, applied in the fields of liquid crystal materials, organic chemistry, chemical instruments and methods, etc., can solve the problems of undiscovered public reports and so on
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[0053] Example 1: Using brominated alkanes and phenolic derivatives as raw materials, after a series of reactions, the Bola compound 9-CONH was synthesized 2 -C 6 h 12 C 4 f 9 , the specific preparation steps are as follows.
[0054] (i) Synthesis of compound 2
[0055] In a 500 mL round bottom flask, the compound 4-hydroxybenzonitrile (16.2 g, 136 mmol) was dissolved in ammonia water (120 mL, 20%) and methanol (60 mL), under vigorous stirring, iodine (69.0 g, 272 mmol) and potassium iodide (90.2 g, 544 mmol) in water (150 mL) were added dropwise, stirred at room temperature for 2 hours, extracted with ethyl acetate (200 mL×3), and washed with water (50 mL× 3), and finally the organic layer was dried with anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure, and recrystallized with absolute ethanol to obtain 23.2 g of a yellow solid. Yield 66%, melting point: 83-84 o C;
[0056] The NMR data are: 1 H NMR (CDCl 3 , 400 MHz): δ = 7....
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