N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
4.13 Natural Products
151
4.13 Natural Products
4.13.1 Amino Acids
13 C Chemical Shifts (δ in ppm; solvent: water)
+
H 3 N
OH
O
H 2 N
O
–
O
+
H 3 N
OH
O
+
H 3 N
OH
O
+
H 3 N
OH
O
H 2 N
O
–
O
+
H 3 N
O
–
O
+
H 3 N
O
–
O
H 2 N
O
–
O
+
H 3 N
O
–
O
+
H 3 N
OH
O
H 2 N
O
–
O
OH
O
+
H 3 N
O
–
O
+
H 3 N
O
–
O
H 2 N
H 2 N
O
–
O
+
H 3 N
O
–
O
+
H 3 N
O
–
O
41.5
36.6
50.1
59.6
52.8
40.1
37.1
15.3
25.9
12.1
25.1
22.1
22.7
58.7
30.0
30.3
32.9
17.9
17.8
17.9
18.5
19.2
20.3
51.9
61.9
54.4
40.7
37.1
15.9
25.6
12.4
25.1
21.8
22.9
60.9
52.7
63.2
55.9
45.5
39.8
16.7
25.2
12.3
25.6
22.5
23.7
62.3
16.5
17.5
21.7
42.8
38.8
46.0
39.3
41.6
34.8
32.2
171.2
175.7
174.0
172.7
174.0
172.8
(pH 0.45)
(pH 0.49)
(pH 0.43)
(pH 1.34)
(pH 0.37)
(pH 0.28)
(pH 4.53)
(pH 5.03)
(pH 4.96)
(pH 5.64)
(pH 7.00)
(pH 6.04)
(pH 12.01)
(pH 12.56)
(pH 12.52)
(pH 12.60)
(pH 13.00)
(pH 12.84)
173.6
179.4
177.0
175.4
176.3
175.0
182.7
182.7
185.7
184.1
185.4
184.1