Source of materialThe title compounds were synthesized as described previously [1] with some minor changes as follows: The crude product (0.201 g, 0.16 mmol) was dissolved in a mixture of acetone/ MeOH (8 ml; 1:1, v/v) at 323 K. After addition of KOH (0.100 g, 1.78 mmol), the solution was filtered hot and an excess of tetrabutylammonium bromide (0.218 g, 0.68 mmol) was added. Crystals were obtained by slow evaporation of the solution at 278 K.
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