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Cantharidin
【Structural formula】
[Molecular formula and molecular weight] C 10 H 12 O 4 ; 196.
[Source] Reagents
【Properties】White massive crystals
This product is soluble in acetone , chloroform , ethyl acetate and oils, slightly soluble in ethanol , ether and hot water, but insoluble in cold water
Melting point: 214~215℃
【Purity Check】
TLC
1.
Developing agent chloroform- acetone (20:3)
After checking the color development of 0.
2.
Eluent petroleum ether (60 ~ 90 ℃) - ethyl acetate (3: 2)
After checking the color development of 0.
Gas chromatography
Chromatographic column HP-5, 0.
Column temperature 195℃
Inlet temperature 220℃
FID detector temperature 260℃
Differential calorimetry
Start temperature 50℃, end temperature 300℃, heating rate 5℃/min
【Structural identification】226,204
1855, 1790 (C=O), 1490, 1465
EI-MS m/z: 148,138,128,96,70
1 H-NMR (CDCl 3 ) δ: 1.
13 C-NMR (CDCl 3 ) δ: 84.
【Storage】Dry and airtight