Chem 278 Pyrolysis Polystyrene.docx

There are also two doublets ppm that suggest the

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ring from the carbon NMR and the IR spectrum. There are also two doublets between 4.5- 6.5PPM that suggest the presence of alkene hydrogens. These support the suggestion of a monosubstituted ring. Styrene is an aromatic ring with 1-propene substituent. The final step was taking a refractive index of the sample. The refractive index obtained was 1.551, which closely resembles styrene’s know RI 1.5469. This fourth property also suggests that molecule from this lab is styrene. After looking at the IR, NMR’s and RI, the evidence suggests that the product of the pyrolysis of polystyrene is styrene. Questions 1. a Polystyrene is chemically very inert, being resistant to acids and bases. b. Styrofoam is very non-polar and unreactive to ions or polar substances. 3. a. Aliphatic C-H = around 3000-2850 cm -1 b. Aromatic C-H = around 3150-3000 cm -1 c. Benzene ring = 1500-1600 cm -1 d. C 6 H 5 group = 500cm -1 e. Attributed to CH 2 bending =1405-1465 cm -1
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Styrene ; 1 H NMR (CDCl 3 ) 7.443 (d, J=7.5Hz, 2H), 7.349 (t, J=15Hz, 2H), 7.270 (t, J= 14.5Hz, 1H), 6.755 (dd, J=11, 1H), 5.280 (d, J=18.5Hz, 1H), 5.258 (d, J=12, 1H); 13 C NMR (CDCl 3 ) 137.598, 136.899, 127.779, 126.205, 113.771, 77.206 1 H NMR 7.443 a 7.349 b 7.270 c 6.755 d 5.280 e 5.258 f 13 C NMR 137.598 A 136.899 B D27.779 C 126.205 D 113.771 E 77.206 F a b c a b f (cis H) e (trans H) d F D C B E A E C
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  • Fall '08
  • CZU
  • Benzene, Nuclear magnetic resonance, Proton NMR, Aromatic hydrocarbon, Carbon-13 NMR

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