Cinnamic acid
[Synonyms] cinnamic acid, trans-Cirnamic acid
【Structural formula】
[Molecular formula and molecular weight] C 9 H 8 O 2 ; 148.
16
[Source] The dry bark of Lauraceae Cinnamomum cassia Presl
.
【Properties】White powder
.
This product is soluble in methanol
.
Melting point: 132~133℃
.
【Purity Check】
TLC
1.
Thin layer plate silica gel G
Developing solvent hexane - ether - acetic acid (5: 5: 0.
1)
Check under UV lamp (254nm)
2.
Thin layer plate silica gel G
Eluent petroleum ether - cyclohexane - ethyl - carboxylic acid (10:30:15:1)
Check under UV lamp (254nm)
High performance liquid chromatography
Chromatographic column AgilentC 18 , 5um (4.
6mm×250mm)
The mobile phase methanol -0.
1% acetic acid (50:50), 1.
0ml / min
Detection wavelength 285nm
【Structural identification】273,216,205
.
2596, 1684, 1631, 1450, 1344, 1288, 1227, 933, 766
.
EI-MS m/z: 148[M] + , 131, 103, 91, 77, 51
.
1 H-NMR (CD 3 OD) δ: 6.
50 (1H, d, J=16Hz, H-8), 7.
39~7.
42 (3H, m, H-2,4,6), 7.
57~7.
60 (2H, m , H-3, 5), 7.
70 (1H, d, J=16Hz, H-7)
.
13 C-NMR (CD 3 OD) δ: 170.
3 (C-9), 119.
3 (C-8), 146.
3 (C-7), 135.
8 (C-1), 129.
1 (C-2, 6), 129.
9 ( C-3, 5), 131.
3(C-4)
.
【Storage】Dry and airtight
.
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