Acetic Anhydride → methyl 6-((4(4-cyano-5-(dicyanomethylene)-2-oxo-2,5-dihydro-1H-pyrrol-3-yl)phenyl)(2-ethylhexyl)amino)hexanoate

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Reaction Steps

In a three-neck flask 6-((2-ethylhexyl)(phenyl)amino)hexyl acetate (7.0 g, 0.020 mol) was added to dimethylformamide (100 ml), stirred, and then added with acetic anhydride (2.9 g, 0.028 mol) and 4-cyano-5-dicyanomethylene-3-hydroxy-2-oxo-3-pyrroline disodium salt (5.6 g, 0.024 mol). The temperature was decreased to 0° C., POCl3 was slowly added thereto for 30 min, and then the mixture was allowed to react at room temperature for 6 hours with stirring. A solid product was precipitated with water, filtered, and then dried, thus obtaining 4.0 g of a dark blue solid.

Provenance & Evidence