Homework Help: amino acids

Posted by Kim on Saturday, June 6, 2009 at 4:10am.

For the amino acid Lysine, the nitrogen with the H attached to it is not basic (since you can draw out the resonance for it). But the other nitrogen that has a double bond is not basic. Why is this?? I can draw out the resonance for the double bonded nitrogen as well.. so shouldnt it be considered nonbasic as well. can someone please explain this to me? Thanks

amino acids - DrBob222, Saturday, June 6, 2009 at 5:03pm
I don't have an explanation for you. The site below shows the structure of lysine and I don't see any doubly bonded N atoms. Both amino groups appear to be primary to me.
http://en.wikipedia.org/wiki/Lysine
amino acids - Kim, Saturday, June 6, 2009 at 6:29pm
sorry i was referring to hisidine

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