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Why do we not see rotation in the peptide bond between the carbonyl carbon and

Why do we not see rotation in the peptide bond between the carbonyl carbon and - Peptide Forum

Why do we not see rotation in the peptide bond between the carbonyl carbon and - Peptide Forum. Ask and discuss questions on peptide protocols, custom peptide synthesis, peptide identification and peptide sequencing.


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Old 02-14-2013, 03:18 PM
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Default Why do we not see rotation in the peptide bond between the carbonyl carbon and



amide nitrogen? Why do we not see rotation in the peptide bond between the carbonyl carbon and amide nitrogen?

a)Because it is a double bond
b)Because it is a single bond
c)Because of bond resonance
d)Because it is a covalent bond
e)Because of hydrogen bonding
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Old 04-03-2013, 09:16 AM
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Smile Re: Why do we not see rotation in the peptide bond between the carbonyl carbon and

c)Because of bond resonance
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Old 04-17-2013, 09:27 AM
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Post Re: Why do we not see rotation in the peptide bond between the carbonyl carbon and

Resonance is the reason why:
Peptide bonds are really made up of 2 resonance contributing structures
1) O=C-N
2) O-C=N
(both Cs are attached to C(alpha))

Just think of it as both bonds having a partial double bond properties.
If you built the models using double bonds you would notice that the whole structure would be planar at that bond and would not allow for rotation due to overlapping orbitals.
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