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Lab Report 3 - Friedel Crafts Reaction

Lab Report 3 - Friedel Crafts Reaction - Kevin Cheng March...

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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
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