Synthesis and characterization of novel organosoluble and optically active aromatic polyesters containing L-methionine and phthalimide pendent groups.
5-(4-Methylthio-2-phthalimidylbutanoylamino)isophthalic acid (5) as a novel diacid monomer containing phthalimide and flexible chiral groups was prepared by dehydration of L: -methionine and phthalic anhydride followed by reacting with thionyl chloride and then treating with 5-aminoisophthalic acid (5AIPA) in dry N,N-dimethylacetamide (DMAc). A series of novel polyesters (PEs) containing phthalimide group was prepared by the reaction of diacid monomer 5 with several aromatic diols via direct polyesterification with tosyl chloride/pyridine/dimethylformamide (DMF) system as condensing agent. The resulting new polymers were obtained in good yields and inherent viscosities ranging between 0.21 and 0.51 dLg(-1) were characterized with FT-IR, 1H NMR, elemental and thermogravimetric analysis techniques. These polymers are readily soluble in polar organic solvents such as DMAc, DMF, dimethyl sulfoxide and protic solvents such as sulfuric acid. Specific rotation experiments demonstrate the optical activity induction due to successful insertion of L-methionine in the structure of pendent groups. Thermogravimetric analysis showed that the 10% weight loss temperature in a nitrogen atmosphere were more than 315 degrees C, which indicates that the resulting PEs have good thermal stability.
Organic Polymer Chemistry Research Laboratory, Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran. mallak@cc.iut.ac.ir
Shadpour
S
Mallakpour
Hojjat
H
Seyedjamali
D000081:Acetamides / Q000737:chemistry; D006841:Hydrocarbons, Aromatic / Q000138:chemical synthesis / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation / Q000379:methods; D008715:Methionine / Q000737:chemistry*; D008968:Molecular Conformation; D010795:Phthalic Acids / Q000138:chemical synthesis* / Q000737:chemistry*; D010796:Phthalic Anhydrides / Q000737:chemistry; D010797:Phthalimides / Q000737:chemistry*; D011091:Polyesters / Q000138:chemical synthesis / Q000737:chemistry; D012995:Solubility; D012997:Solvents / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013237:Stereoisomerism; D013461:Sulfur Oxides / Q000737:chemistry; D013696:Temperature; D013818:Thermogravimetry; D014783:Viscosity
C530679:5-(4-methylthio-2-phthalimidylbutanoylamino)isophthalic acid; D000081:Acetamides; D006841:Hydrocarbons, Aromatic; D010795:Phthalic Acids; D010796:Phthalic Anhydrides; D010797:Phthalimides; D011091:Polyesters; D012997:Solvents; D013461:Sulfur Oxides; C037431:phthalimide; C023589:thionyl chloride; C102688:5-aminoisophthalic acid; D008715:Methionine; C013959:dimethylacetamide; C043103:phthalic anhydride