Chemistry Reference
In-Depth Information
H
O
H
H
O
H
_
_
+
N
+
N
HO
H
3
N
C
C
C
C
O
H
3
N
C
C
C
C
OH
CH(CH
3
)
2
H
O
CH(CH
3
)
2
H
O
most acidic (pH 1)
about pH 6 (dipolar ion)
_
H
O
H
HO
_
N
H
2
N
C
C
C
C
O
CH(CH
3
)
2
H
O
most basic (pH 10)
17.40
With four different amino acids there are 4!, or 4 x 3 x 2 x 1 = 24, possible structures.
They are as follows:
CASL ACSL SCAL LCAS
CALS ACLS SCLA LCSA
CSAL ASCL SACL LACS
CSLA ASLC SALC LASC
CLSA ALCS SLCA LSCA
CLAS ALSC SLAC LSAC
17.41
Hydrogen peroxide oxidizes thiols to disulfides (Sec. 7.17). See also eq. 17.10.
CH
3
H
O
N
H
2
N
C
C
C
CH
2
C
OH
SH
H
O
H
O
CH
2
H
2
O
2
S
N
H
2
N
C
C
C
C
OH
S
CH
3
H
O
H
O
CH
2
N
H
2
NCC
C
C
OH
CH
3
H
O
17.42
a.
Use eq. 17.11, with R
1
= H and … = OH:
F
NHCH
2
CO
2
H
NO
2
NO
2
mild
+N
H
2
CH
2
CO
2
H
base
NO
2
NO
2
b.
Lysine contains two primary amino groups. Each group can react with 2,4-
dinitrofluorobenzene:
