Liquid crystal compound, liquid crystal composition containing liquid crystal compound and liquid crystal display component
A technology of liquid crystal compounds and liquid crystal compositions, applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve problems such as low driving voltage
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[0100] The method for preparing the compound shown in the formula I provided by the present invention can be synthesized according to the following scheme:
[0101] 1) When R represents a substituted or unsubstituted alkyl or alkenyl, the reaction process is as follows:
[0102]
[0103] Its preparation comprises the following steps:
[0104] a. to and As a raw material, in the presence of a base catalyst, a substitution reaction occurs to obtain
[0105] b. to and RI as raw materials, in the presence of BuLi catalyst, a substitution reaction occurs to obtain the compound shown in formula I.
[0106] 2) When R represents a substituted or unsubstituted alkoxy group, the reaction process is as follows:
[0107]
[0108] Its preparation comprises the following steps:
[0109] ① Prepared by the above method and B(OCH 3 ) 3 As a raw material, in the presence of a BuLi catalyst, a substitution reaction occurs to obtain
[0110] ② to As a raw material, in the...
Embodiment 1
[0116] The compound structural formula is shown in the following formula I-2-1:
[0117]
[0118] Its preparation route is as follows:
[0119]
[0120] The specific operation process of preparation:
[0121] Step 1: Intermediate 1-a
[0122] Throw 0.5 mol of cyclopentylmethyl bromide, 0.5 mol of 2,3-difluorophenol, 0.6 mol of anhydrous potassium carbonate, and 1.0 LDMF into a 2L three-necked flask, stir and heat to 80°C for 4 hours. After the reaction is complete, add 1.5L of water and 0.5L of ethyl acetate and stir to separate the liquids. The organic phase is washed with 0.5L×2 water, dried with anhydrous sodium sulfate, and the liquid is spin-dried, and distilled under reduced pressure to obtain 80g of intermediate 1- a, GC: 96%, yield Y=75%.
[0123] Step 2: Target compound I-2-1
[0124] Add 0.2mol of intermediate 1-a and 250mL of tetrahydrofuran into a 1L three-necked flask, start stirring, fill with nitrogen to replace the air, place in a low-temperature tank...
Embodiment 2
[0126] The structural formula of the compound is shown in the following formula I-6-1:
[0127]
[0128] Its preparation route is as follows:
[0129]
[0130] The specific operation process of preparation:
[0131] Step 1: Intermediate 2-a
[0132] Using cyclopropylmethyl bromide instead of cyclopentylmethyl bromide as raw material, refer to step 1 in Example 1 to synthesize intermediate 2-a;
[0133] Step 2: Target compound I-6-1
[0134] Using 4-iodo-1-butene instead of iodoethane as raw material, the target compound I-6-1 was synthesized with reference to step 2 in Example 1.
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