STEREOCHEMICAL AND COMPOSITIONAL ASSIGNMENT OF ACRYLONITRILE METHYL METHACRYLATE COPOLYMERS BY DEPT AND INVERSE HETCOR NMR-SPECTROSCOPY/

The acrylonitrile/methyl methacrylate copolymers of different monomer concentration were prepared by photo polymerization using uranyl ion a s initiator. The carbon 13 and proton spectra of these copolymers are overlapping and complex. The complete spectral assignment of the C-13- and H-1-NMR, spectra were done with the help of Distortionless Enhanc ement by Polarization Transfer (DEPT) and two dimensional C-13-H-1 Het eronuclear Single Quantum Correlation (HSQC) experiments. The methylen e, methine and the methyl carbon resonances show both stereochemical ( triad level) and compositional (dyad, triad, tetrad, pentad and hexad. level) sensitivity. 2D Double Quantum Filtered Correlated Spectroscop y (DQFCOSY) experiment was used to ascertain the various geminal coupl ings between the methylene protons. (C) 1998 John Wiley & Sons, Inc.