Cyanophthalanil, trimerization

Trimerization of p-Cvanophthalanil. p-Cyanophthalanil was synthesized as the model compound to study the effectiveness of PTSA in promoting trimerization of a chemical structure which would be found in the polyimide precursors. 

Catalytic trimerization of p-cyanophthalanil with 5 mole percent p-toluenesulfonic acid at 250-300°C and M-.97 to 5.52 MN/m (720-800 psi) for 90 hours gave a 979 yield product, with a m.p. >3h0°C. The infrared spectrum showed the disappearance of the nitrile band at 22W cm and the broadening of the s-triazine bands at 1520 and 1380 cm ... 

Polvimide/Graphite Fiber Reinforced Composite. Since aromatic nitrile-terminated imide oligomers are similar in nature as p-cyanophthalanil and possess the same functionality as terephtiijilonitrile, they ould be able to trimerize smd form the s-triazine ring containing polymers under the similar reaction conditions. 

Figure 5. (a) IR spectrum of p-cyanophthalanil (PCPLAL) (b) IR spectrum of trimerized product of PCPLAL (c) IR spectrum of PCPLAL trimerized product after refluxing with 10% NaOH for 4 hr. 

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See also in sourсe #XX -- [ ]

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