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zhiyuan3yu5

  • 3 years ago

Sometimes the 1-phenylethylamine tartrate salt crystallizes as fine needles rather than the desired prisms. The 1-phenylethylamine recovered from these needles has been found to have a specific rotation of -20.1 degrees. What percent of (-)-1-phenylethylamine is this amine mixture? What is the percent of (+)-1-phenylethylamine?

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  1. aaronq
    • 3 years ago
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    do you have the data of the light rotation of the mixture?

  2. zhiyuan3yu5
    • 3 years ago
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    [a]D of pure (-) 1-phenylethylamine is -40.2 degrees

  3. aaronq
    • 3 years ago
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    actually 3/4 and 1/4 3/4 x -40 = - 30 1/4 x 40 = 10 = -20

  4. zhiyuan3yu5
    • 3 years ago
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    okay that makes sense. thank you. do you think you can help me with another problem related to optical purity?

  5. aaronq
    • 3 years ago
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    il give it a try, but i don't promise anything

  6. zhiyuan3yu5
    • 3 years ago
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    ok

  7. zhiyuan3yu5
    • 3 years ago
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    after the formation and separation of diastereomers and treating the diastereomer salt with excess strong base, what other experimental method can be used to yield (-)-1-phenylethylamine of higher optical purity?

  8. zhiyuan3yu5
    • 3 years ago
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    this is basically the lab : http://www.chem.ucla.edu/~bacher/Specialtopics/Resolution.html

  9. aaronq
    • 3 years ago
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    im not sure, but in the link you send me is says "The (1R,2R)-amine-(2R,3R)-acid salt crystallizes from hot water, while the (1S, 2S)-amine-(2R,3R)-acid and the cis salts stay in solution." have you figured out the stereochem of that you're separating

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