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A novel triptycene-based dianhyride as a shape-persistent building block with high internal free volume was conveniently synthesized via solvothermal method. Subsequently, three all-aromatic polyimides, PIa, PIb and PIc, were prepared by a one-step polycondensation of triptycene-2,3,6,7-tetracarboxylic dianhydride with 2,2′-bis(trifluoromethyl)benzidine, m-tolidine and 3,3′,5,5′-tetramethylbenzidine,...
This paper presents the amination reactions of electron deficient aryl chlorides promoted by Mg(OH) 2 without transition metals. Only using stoichiometric amount of nano sized Mg(OH) 2 , good to moderate isolated yields could be achieved in N-methylpyrrolidone (NMP) after 24h at 150°C.
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