Phosphorus oxychloride → 2,7-Di-(pyrrolidinomethyleneamino)-5,10-dioxo-4,5,9,10-tetrahydro-4,9-dioxapyrene

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Reaction Steps

A suspension of 2,7-diamino-5,10-dioxo-4,5,9,10-tetrahydro-4,9-dioxapyrene (500 mg) in tetrahyrofuran (4 ml) was added to a mixture of phosphorus oxychloride (0.7 ml) and N-formylpyrrolidine (2 ml) and tetrahydrofuran (4 ml), the temperature of the mixture being kept at 5° C. The resulting mixture was stirred for 30 minutes at room temperature, heated at 80° C. for 1 hour and worked up as described in Example 1, paragraph 1. Yield 68%, melting point 275° C. (decomposition) (CHCl3 /methanol).

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