A fhaightear trí dhiazotization agus a chur in ionad p-toluidine {. ar dtús, cuir an tuaslagán uiscí aigéad sulfarach leis an p-toluidine brúite agus é te, fuaraigh é go 5 chéim, agus cuir an tuaslagán sóidiam nítrite go mall le húdarú poléarach an pháipéir bhig de chuid an pháipéir bhig le díomhaoin {{}} nitrite. Add the synthesized cuprous bromide to hydrobromic acid, heat to boiling, then slowly add the diazonium salt mentioned above and distill it until no oil is produced. Wash, dry, filter, distill at atmospheric pressure, and collect the 183-185℃fraction to obtain the finished product. The cuprous bromide hydrobromic acid solution can be prepared by heating and refluxing a mixture of copper sulfate, copper shavings, sodium bromide dihydrate, concentrated sulfuric acid, and water for 3-4 hours until the solution turns light yellow, which is the cuprous bromide hydrobromic acid solution.