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Synthesis and characterization of novel thermally stable and optically active poly(amide-imide)s derived from N,N′-(4,4′-diphthaloyl)-bis-L-leucine diacid and aromatic diamines

✍ Scribed by Der-Jang Liaw; Feng-Chyuan Chang; Jui-Hsiang Liu; Kun-Li Wang; Khalil Faghihi; Kueir-Rarn Lee; Juin-Yih Lai

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
126 KB
Volume
104
Category
Article
ISSN
0021-8995

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✍ Shadpour Mallakpour; Elaheh Kowsari 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 137 KB 👁 1 views

## Abstract 3,3′,4,4′‐Diphenylsulfonetetracarboxylic dianhydride (**1**) was reacted with __L__‐leucine (**2**) in acetic acid and the resulting imide‐acid (**3**) was obtained in high yield. The diacid chloride (**4**) was prepared from diacid derivative (**3**) by reaction with thionyl chloride.