Formation of blue diquinolinyl methine dyes by irradiation of N-acylated primaquine in chloroform solution with ultraviolet light

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Abstract
Irradiation of N-acylated primaquines 1b–d in chloroform solution with ultraviolet light afforded blue diquinolinyl methine dyes 3b–d. The structures of compounds 3b–d are supported by spectral data, synthesis of 3c from 1c with orthoformate, and chemical reduction of 3d affording known dimer 5d.