Diethyl Ether → HCID 178496224, 화합물

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Both 1 mmol 1-(5-carboxypentyl)-3-methyl-2-((E)-2-phenylamino-vinyl)-5-sulfo-3-(3-sulfopropyl)-3H-indolium and 1 mmol 1-[2-(2-methoxy-ethoxy)-ethyl]-2,3-dimethyl-5-sulfo-3-(3-sulfo-propyl)-3H-indolium were dissolved in 20 ml acetic acid/acetic anhydride (1/1) followed by the addition of 200 mg sodium acetate. The solution was stirred under reflux for 15 min. After cooling to room temperature, 20 ml diethylether was added. The resulting precipitate (mixture of the diastereomers 550-1 compound 2 and 550-2 compound 2) was extracted by suction, washed with ether and dried.

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