00:02
This is the answer to chapter 19, problem number 67, from the smith organic chemistry textbook.
00:10
And this problem says lysine and tryptophan are two amino acids that contain an additional nitrogen atom in their side chains.
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Lysine is classified as basic.
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Triptophan is not basic.
00:25
And so we are asked to explain why this difference in classification occurs.
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And so i've drawn lysine and tryptophan here.
00:36
I guess i should maybe label them.
00:38
So this one on the left is lysine.
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And on the right is tryptophan.
00:49
Triptophan.
00:51
Actually, is it a ph? it is.
00:53
So lysine and triptophan.
00:55
And so basically what we need to look at is the lone pair on each of these nitrogens in the side chains.
01:02
So this is what we're talking about, what i've green arrowed here.
01:06
And in lysine, that loan pair is localized...