Chem 3BL - Lab Report E#18

Chem 3BL - Lab Report E#18 - Kylie 28 September 2010 Chem...

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Kylie 28 September 2010 Chem 3B Lab Experiment #18 Discussion: NMR Spectra: on the following pages The NMR spectra confirmed the relative amount of carbons and hydrogens in the product molecule, and also showed that the two t -butyl groups were located on the same-numbered carbon of each phenyl (4,4). Since they're equidistant from the phenyl-phenyl bond, they result in the tall, single H peak (at 1.33 ppm) that represents the 18 equal hydrogens. The 2 other isomers, which are the result of ortho-additions of the t -butyl groups, would either create more H peaks due to the asymmetrical positions (a) or show a tall H peak closer to the other peaks, with a higher ppm (b). The TLC results of the starting material and the product were very similar, making it difficult to distinguish them from each other. Since hydrogen-bonding or significantly polar molecules were not involved, similar Rf values and lack of separation were expected from the hexane developing chamber.
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Chem 3BL - Lab Report E#18 - Kylie 28 September 2010 Chem...

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