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Unformatted text preview: structure of these peptide linkage units is usually written as: Q H II I -C-N-Complete the Lewis structure for the above peptide unit by adding in the lone pairs. An important structural feature ofthis peptide unit is that it is planar because the C-N bond has partial double-bond character, which prevents the rotation about the C-N that could occur if it were strictly a single bond. Draw a resonance structure for the peptide unit with formal charges that explains this partial double bond character. Based on your resonance structures, what would you predict about the multiplicity of the C=Q bond? What geometrical feature could you measure to determine the approximate mUltiplicity of the C-N and C=Q bonds, and what would you predict for it's value for these two bonds? , , ' 0 ' t+ f"" o c. h-d'" \' , f)J'" NL ..... G-N , . - _._ ---------...
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This note was uploaded on 12/05/2011 for the course CHEMISTRY 31 taught by Professor Roy during the Fall '09 term at Duke.
- Fall '09