circular chromatography

circular chromatography

[′sər·kyə·lər ‚krō·mə′täg·rə·fē]
(analytical chemistry)
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Purification of compounds was carried out by silica gel circular chromatography (Chromatotron model 7924, Harrison Research) or by flash chromatography.
The resulting oil is purified by silica gel circular chromatography (Chromatotron model 7924, [H.sub.ar]rison Research, eluent: MeOH/C[H.sub.2][Cl.sub.2]).
Compound 6 (1040 mg, 4.8 mmol) was obtained as yellow oil after silica gel circular chromatography (0-15% AcoEt/Hex), yield = 72%.
Compound 7 was obtained as a yellow oil after silica gel circular chromatography (0-1% MeOH/C[H.sub.2][Cl.sub.2]), yield = 70%.
Following general procedure I with azide 6, compound 8a was obtained as a white powder after silica gel circular chromatography (1% MeOH/C[H.sub.2][Cl.sub.2]), yield = 88%.
Following the same procedure as 6, but with diacetylcaffeic acid 10 instead of cinnamic acid 1, compound 11 was obtained as white crystals after silica gel circular chromatography (0-30% AcOEt/Hex), yield = 65%.
Following the same procedure as 7, but with diacetylcaffeic acid 10 instead of cinnamic acid 1, compound 12 was obtained as a white solid after silica gel circular chromatography (0-1% MeOH/C[H.sub.2][Cl.sub.2]), yield = 71%.