Synthesis and characterization of new organosoluble poly(ether imide)s derived from various novel bis(ether anhydride)s - Polyimides and Other High Temperature Polymers - page 48

(a)
(b)
(c)
Scheme I. Synthesis of various diols (1A-1C, 1E and 1F). (From Refs. 38-43.)
methanol, filtered out and dried. The crude product was then recrystallized from
acetonitrile twice to obtain yellow crystals of bis(ether dinitrile) (2A, Scheme II),
in 83% yield [38, 39].
The synthesis methods for bis[4-(3,4-dicyanophenoxy) phenyl]diphenyl-
methane (2B), 1,1-bis[4-(4-dicyanophenoxy) phenyl]-4-tert-butylcyclohexane