Search for physiologically active compounds. Part VII. Synthesis of halo and nitro coumarones

5- and 5:7-dihalo, 5-methoxy-7-halo and 5-methoxy-7-nitro, 5-halo-6-methoxy and 5-nitro-6-methoxy coumarones have been synthesised by condensing the appropriately substituted salicylaldehydes with bromomalonic ester