HCID 14967807, compound → HCID 14967808, compound

Participants

Reaction Steps

15 g (0.024 mol) of 4,8-dibromo-1,5-ditoluene-p-sulfonamidonaphthalene (J. S. Whitehurst, J. Chem. Soc., 221-226 (1951)) are dissolved in 75 ml of concentrated H2SO4 and the solution is left to stand for 24 h, excluding light. The solution is then poured on to 450 g of ice, whereupon a violet solution forms from which the product precipitates as HSO4 salt after a few minutes. The precipitate is isolated by suction filtration and the filter cake is squeezed out to give a pale beige-violet crude product that is further processed immediately.

Provenance & Evidence