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Synthesis and characterization of polyimides from imidazole-blocked 2,5-bis[(n-alkyloxy)methyl]-1,4-benzene diisocyanates and pyromellitic dianhydride

โœ Scribed by Jin Chul Jung; Sang-Bong Park

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
668 KB
Volume
34
Category
Article
ISSN
0887-624X

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โœฆ Synopsis

SY N

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Optically active 2,2ะˆ-bis(2-trifluoro-4-aminophenoxy)-1,1ะˆ-binaphthyl and its corresponding racemate were prepared by a nucleophilic substitution reaction of 1,1ะˆ-bi-2-naphthol with 2-chloro-5-nitrotrifluorotoluene and subsequently by the reduction of the resulting dinitro compounds. A series of opt