8. One stereoregular form of polystyrene (A) has a 'H NMR spectrum containing a triplet centered at about 1.4 ppm and a quintet at about 1.9 ppm. Another stereoregular form (B) has an octet at about 1.6 ppm and a quintet at about 2.3 ppm. (Both spectra also exhibit phenyl proton resonances further downfield.) Interpret the spectra and determine which corresponds to isotactic and which to syndiotactic. (Syndiotactic polystyrene was first reported by N. Ishihara and co-workers in a 1986 paper. You may wish to locate the paper and check your answer.)

8. One stereoregular form of polystyrene (A) has a 'H NMR spectrum containing a triplet centered at about 1.4 ppm and a quintet at about 1.9 ppm. Another stereoregular form (B) has an octet at about 1.6 ppm and a quintet at about 2.3 ppm. (Both spectra also exhibit phenyl proton resonances further downfield.) Interpret the spectra and determine which corresponds to isotactic and which to syndiotactic. (Syndiotactic polystyrene was first reported by N. Ishihara and co-workers in a 1986 paper. You may wish to locate the paper and check your answer.)

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Butanal and methylpropanal give slightly different mass spectra. Both give a molecular ion peak at m/z methylpropanal only gives three. State the species responsible for the four other peaks in the mass spectrum of butanal and write equations to show their 72, but butanal gives four other peaks whereas formation from the molecular ion.