4-Nitrobenzaldehyde → trans-4-Nitrostilbene
Reaction equation
[N+:1]([C:4]1[CH:29]=[CH:28][C:7]([CH2:8]P(C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=[CH:6][CH:5]=1)([O-:3])=[O:2].[N+]([C:33]1[CH:40]=[CH:39][C:36]([CH:37]=O)=[CH:35][CH:34]=1)([O-])=O>O1CCCC1>[CH:33]1[CH:40]=[CH:39][C:36](/[CH:37]=[CH:8]/[C:7]2[CH:6]=[CH:5][C:4]([N+:1]([O-:3])=[O:2])=[CH:29][CH:28]=2)=[CH:35][CH:34]=1Participants
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
In an embodiment of the invention, a method for preparing the aforesaid alignment film in a laboratory level is illustrated as an example. 10 g of 4-nitrobenzyl bromide is mixed with 12 g of triphenylphosphine and dissolved in 150 ml of a dry tetrahydrofuran solution, heated to 75° C. and agitated under reflux for 48 hours, to obtain 8.2 g of a dry white p-nitrobenzyl triphenylphosphine. The p-nitrobenzyl triphenylphosphine is mixed with 2.6 g of p-nitrobenzaldehyde in a 150 ml tetrahydrofuran solution, and agitated under room temperature for about 24 hours to obtain 4.2 g of p-nitrostilbene. The resultant p-nitrostilbene is mixed with 14.7 g of tin dichloride, dissolved in a mixed solution of 30 ml/40% hydrochloride acid and 100 ml acetone, agitated under the room temperature for about 2 hours and refluxed for 8 hours to obtain p-aminostilbene. The p-aminostilbene is mixed with 9,9′-bianthracyl tetracarboxylic dianhydride in a dry NMP (N-methyl-pyrrolidone) solution under agitation for 24 hours, under protection of nitrogen gas, to obtain the precursor of the polyimide alignment film involved in the embodiment. The precursor is heated to 230° C. to obtain the final alignment film, which is a light sensitive alignment film.
Sources & evidence
- ORD record
- ord-b5942e82e3f6416684b84e60eb02697a
- Source dataset
- uspto-grants-2016_04
- Patent number
- US09323107B2
Reaction notes
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