Hydrochloric Acid → HCID 21252623, compound

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Reaction Steps

In a preferred specific form of the invention 9-nitroanthracene is reacted with hydrated tin chloride and acetic acid in the presence of concentrated HCl to produce an aqueous solution of 9-aminoanthracene hydrochloride salt, and the solution is stirred in air at room temperature while 5% aqueous ammonia solution is added slowly until the pH rises to 1.8 to 2.0, the solution is stirred at this pH for at least 5 minutes and then further 5% aqueous ammonia is added slowly to bring the pH up to the range 5.8 to 6.0 and the stirring is continued at that pH for 3 to 6 hours and then further 5% aqueous ammonia is added to bring the pH into the range 8.5 to 9.0 with continued stirring, and the yellow solid which precipitates out is recovered.

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