N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
122
4 13 C NMR
13 C Chemical Shifts of Cyclic Ethers (δ in ppm)
13 C Chemical Shifts of Acetals, Ketals, and Ortho Esters (δ in ppm)
O
O
CH 3
CH 3
O
O
H 3 C
H 3 C
O
O CH 3
CH 3
O
H 3 C
O
O
CH 3
CH 3
H 3 C
H 3 C
O
O
CH 3
CH 3
O
O
O
O
O
O
O
O
O
O
O
O
N
H
O
S
O
O
O
O
O
O
39.5
67.6
68.6
53.7
24.9
94.8
27.5
67.5
93.7
50.4
58.3
14.8
51.1
115.0
15.2
112.9
59.5
48.1
64.5
95.0
99.9
121.0
119.7
75.3
145.6
109.9
121.8
108.8 147.8
100.7
28.5
126.3
98.4
68.1
68.5
46.7
27.0
22.9
72.6
68.4
69.5
64.8
141.1
144.1
27.7
22.6
19.4
101.1
99.4
24.9
26.5
O
O
O
O
O
O
O
O
O