Problem4

Problem4 - such that the signal observed in a separate...

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Problem Set 4 Chemistry 154A/254A: Quantum Chemistry Professor Song-I Han Teaching Assistant: Wang, Xiqing (Francis) Office: Chemistry 3223 Office: Chem 1126/ Dahlquist Lab (1 th floor) Office hours: Tue, Th 4-5 pm Office hours: Wed 1-2 pm and Fr 4-5pm Email: [email protected] Email: [email protected] temporarily Mark Lingwood ( [email protected] ) 1. Look up the 13 C NMR spectrum of Acetone on SDBS. The spectrum on SDBS was taken with broadband 1 H decoupling. Draw what you would expect if you took a spectrum without any 1 H decoupling. 2. The following data was obtained during an inversion recovery experiment to determine the T 1 . Using this data, find the T 1 as accurately as possible. The given integral of the observed signal is normalized
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Unformatted text preview: such that the signal observed in a separate experiment, a simple 90º pulse, is set to 1 (M = 1). Delay (s) Integral-1 0.5-0.624 1-0.318 1.5-0.071 2 0.131 3 0.427 4 0.622 5 0.751 6 0.836 7 0.892 8 0.929 3. Use the following two molecules for this question. a) Compare the multiplet structures for the 13 C NMR of carbons 1 and 5. b) Rank the 13 C T 1 ’s of carbons 1-4 (not carbon 5), from longest to shortest. c) Compare the 13 C T 1 ’s of carbons 1 and 5. d) Imagine that you take a 1 H NMR of one of these compounds, and the NH 2 protons are not visible. What could you do to your sample to make these protons visible?...
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This note was uploaded on 08/06/2008 for the course CHEM 154A taught by Professor Han during the Winter '08 term at UCSB.

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