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Unformatted text preview: 6. Why is it more effective to perform an extraction with several small portions of solvent as opposed to one large portion of solvent of equal volume? 7. Answer question # 6 at the end of the reading for technique 19. 8. (Complete your cyclohexanol spectral analysis before proceeding.) Below is the 1 H NMR spectrum for cis-1,3,5-cyclohexanetricarboxylic acid. Draw the structure in the most stable chair conformation then label and assign all nonequivalent hydrogens using your analysis of cyclohexanol as a guide. 9. (Chem 354 only) Explain why the peak centered at 2.1ppm appears as a doublet. Does your explanation confirm that equatorial hydrogens are more deshielded than axial hydrogens as in the reference molecule provide for cyclohexanol? (Hint: Read technique 21.9, and understand how to apply Figure 21.28 in the techniques manual; your argument should include relevant dihedral angles.)...
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- Winter '11
- Organic chemistry