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Synthesis and characterization of novel optically active poly(urethane urea)s: Effect of left/right rotation conformation

✍ Scribed by Zhi-Qiang Wang; Yu-Ming Zhou; Xiao-Yun Ye; Jing Chen; Yan-Qing Sun


Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
338 KB
Volume
111
Category
Article
ISSN
0021-8995

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4,4'-(HexaΒ―uoroisopropylidene)-bis-(phthalic anhydride) (1) was reacted with L-leucine (2) in toluene solution at reΒ―uxing temperature in the presence of triethylamine and the resulting imideacid (4) was obtained in quantitative yield. The compound (4) was converted to the diacid chloride (5) by rea