... Belges, 75, pp. 391-395, fig. ... The starting material is resorcinol (I), which is converted into 3-bromo-5-nitro-P- resorcilyc acid (11) by way of P-resorcilyc acid ( 3, and 5-nitro-P-resorcilyc acid (4). The brominated compound (11) (') is transformed into 2-bromo- resorcinol (111) by ...