| 摘要 |
PURPOSE:To efficiently obtain the subject compound useful as a raw material for producing a polyimide having low dielectric constant, excellent moldability and processability by subjecting 3,5-dinitrotrifluoromethylbenzene to self condensation reaction in the presence of a nitrite in an aprotic polar solvent. CONSTITUTION:3,5-Dinitrotrifluoromethylbenzene of formula I is reacted in the presence of a nitirde (e.g. sodium nitrite) in an aprotic polar solvent such as 1,3-dimethyl-2-imidazolidinone in a reactor under heating while introducing a nitrogen gas under stirring at 130 deg.C for 10 hours. The reaction mixture is discharged into water, precipitated solid constituted is filtered and dried to give a crude reactional product. Then the crude reactional product is purified by sludging with methanol to give the objective compound of formula II useful as an intermediate for 3,3'-diamino-5,5'-bis(trifluoromethyl)diphenyl ether useful as a raw material of producing polyimides, etc.
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