Chemistry Reference
In-Depth Information
(a)
PPM
4.2
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
(b)
OAc
OAc
O
OAc
OAc
OAc
O
O
OAc
OAc
OAc
O
O
OAcOAc
O
PPM
175.0 165.0 155.0 145.0 135.0 125.0 115.0 105.0
95.0
85.0
75.0
65.0
55.0
45.0
35.0
25.0
15.0
(a)
1
H-NMR spectrum of the peracetyl polyhydroxy triglyceride deriva-
tive of milkweed oil. (b)
13
C-NMR spectrum of the peracetylated poly-
hydroxy triglyceride derivative of milkweed oil.
Figure 10.2
ring-opening with generation of an a-hydroxyl formate ester with or without
a strong acid catalyst. We opted not to use any catalyst. What was actually
observed in the reaction process under gentle reflux, as the reaction pro-
gressed and was sampled for FT-IR spectroscopy, was the non-appearance of
the expected hydroxyl group absorbance in its characteristic 3500-3300 cm
1
region as the epoxy ring absorption (820-840 cm
1
) diminished. The
