N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
252
5 1 H NMR
252
5 1 H NMR
Cyclohexane-d 12
10
9
8
7
6
5
4
3
2
1
0
1.40 1.35
1.38
Dimethyl sulfoxide-d 6
10
9
8
7
6
5
4
3
2
1
0
2.55 2.50 2.45
2.50
3.31 (H 2 O)
Methanol-d 1
10
9
8
7
6
5
4
3
2
1
0
3.40 3.35 3.30
3.35
Methanol-d 4 
10
9
8
7
6
5
4
3
2
1
0
3.35 3.30 3.25
4.84
3.31
Pyridine-d 5
10
9
8
7
6
5
4
3
2
1
0
4.91 (H 2 O)
8.73 7.58
7.21
Tetrahydrofuran-d 8
10
9
8
7
6
5
4
3
2
1
0
1.75 1.70
3.60 3.55
1.72
3.58