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Unformatted text preview: Kevin Cheng March 7, 2008 The Friedel-Crafts Reaction Lab In this lab, AlCl 3 was made in solution using aluminum and the HCl produced by t-butyl chloride, and subsequently the AlCl 3 served to catalyze the alkylation of biphenyl, also in solution, to give a di- substituted benzene product. The H NMR spectrum had peaks indicating a ratio of 9:2:2 hydrogens of three different types, with the 9 spike in the range for RCH 3 hydrogens and the other two peaks lying in the aromatic hydrogen range. This ratio suggested that the biphenyl product was disubstituted with t-butyl groups opposite from each other to yield a total of 18 equivalent hydrogens from the t-butyl groups and 8 aromatic hydrogens, which can be broken down into separate groups of four equivalent hydrogens, confirming the two peaks in the spectrum. The C[H] NMR spectrum supported this proposition because it had the four peaks in the aromatic carbon range expected from having the biphenyl be symmetrically substituted from opposite ends, and also there was a peak with a low ppm value indicative of the six...
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