Pyromellitic dianhydride → Pmda 4-aba

HRID 1781964Notes

Reaction equation

HRID 1781964 reaction equation
[CH:1]1[C:6]2[C:7]([O:9][C:10](=[O:11])[C:5]=2[CH:4]=[C:3]2[C:12]([O:14][C:15](=[O:16])[C:2]=12)=[O:13])=[O:8].[CH:17]1[CH:30]=[C:29]2[C:20]([CH:21]=[C:22]3[C:27](=[CH:28]2)[CH:26]=[CH:25][C:24]([CH2:31][CH2:32][CH2:33][C:34]([OH:36])=[O:35])=[CH:23]3)=[CH:19][CH:18]=1>CN1C(=O)CCC1>[CH:4]1[C:3]2[C:12]([O:14][C:15](=[O:16])[C:2]=2[CH:1]=[C:6]2[C:7]([O:9][C:10](=[O:11])[C:5]=12)=[O:8])=[O:13].[CH:17]1[CH:30]=[C:29]2[C:20]([CH:21]=[C:22]3[C:27](=[CH:28]2)[CH:26]=[CH:25][C:24]([CH2:31][CH2:32][CH2:33][C:34]([OH:36])=[O:35])=[CH:23]3)=[CH:19][CH:18]=1

Participants

4

Reactant 2

HCID 6966Pyromellitic dianhydrideHCID 1013804-(2-Anthryl)butanoic acid

Product 1

HCID 131727343Pmda 4-aba

Reagents, catalysts & solvents 1

HCID 13387N-methyl-2-pyrrolidoneSolvent2×

Procedure

20.94 g (0.096 mol) of PMDA, 11.00 g (0.09 mol) of 4-ABA and 3.49 g (0.01 mol) of DAHOB were reacted in 201 g of NMP at room temperature for 5 hours to prepare a polyamic acid solution. The polymerization reaction proceeded easily and uniformly, and the molecular weights were measured in the same manner as in Preparation Example 1 and as a result, a solution of a polyamic acid having a number average molecular weight of 7,038 and a weight average molecular weight of 12,695 was obtained. Further, to this solution, poor solvents BCS and NMP were added so that the polyamic acid concentration would be 5 mass % and the BCS concentration would be 20 mass % to prepare a liquid crystal aligning agent.

Workup

  1. customto prepare a polyamic acid solution
  2. customThe polymerization reaction
  3. customuniformly, and the molecular weights were measured in the same manner as in Preparation Example 1 and as a result
  4. customa weight average molecular weight of 12,695 was obtained
  5. concentrationthe BCS concentration
  6. customto prepare a liquid crystal aligning agent

Sources & evidence

ORD record
ord-00c4384d6b5048e79b0f47e3215b50a5
Source dataset
uspto-grants-2009_03
Patent number
US07498068B2

Reaction notes

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