4,4'-(Hexaยฏuoroisopropylidene)-bis-(phthalic anhydride) (1) was reacted with L-leucine (2) in toluene solution at reยฏuxing 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
Synthesis and characterization of novel optically active polyesters with high thermal stability
โ Scribed by Sara Ehsani; Shahram Mehdipour-Ataei; Ali Mahmoodi
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 719 KB
- Volume
- 120
- Category
- Article
- ISSN
- 0021-8995
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๐ SIMILAR VOLUMES
Tetrachlorophthalic anhydride (1) was reacted with L-leucine (2) in toluene solution at refluxing temperature in the presence of triethylamine and the resulting imide-acid (4) was obtained in quantitative yield. The compound (4) was converted to the N-(tetrachlorophthaloyl)-L-leucine acid chloride (
A multimode step-index polymer optical fiber has been developed based on a highly crosslinked polycarbosiloxane as the core material and a fluorinated polyolefin (poly(fluoroethylene-co-fluoropropylene) -FEP) cladding layer. The combination offered a system with a high thermal stability, both optica
Novel dial monomer having a n-conjugated benzoxazole ring, 2-(4-nitrophenyl)-6-IN,N-bis(2-hydroxyethyl)amino]benzoxazole was successfully synthesized to improve the thermally stability of nonlinear optical chromophores. Several polyurethanes bearing pendant benzoxazole chromophores were obtained by
## Abstract A new diacid monomer **9** was synthesized in five steps. Starting from the reaction of Lโleucine with phthalic anhydride in acetic acid provided (2__S__)โ4โmethylโ2โphthalimidylpentanoic acid (**3**) in good yield. The compound **3** was converted to (2__S__)โ4โmethylโ2โphthalimidylpen