What is the problem of turning the color of carboxyl acid and chlorine?

I studied analysis, and I didn't quite understand.Why does the reaction use toluene as a solvent? Do toluene not react with melchrine?

The reaction of DMF participation is not a few uncommon. Why do you use DMF? Direct acid+chlorine chloride back, and then distilled OK

Carboxylic acid is used as a galmchloride, and there is no need to add dmf catalyst

This gyrode reaction is the best without solvent, and then try toluene, the temperature can be 100

Real -time monitoring reaction, after finishing, do not wait until it is dark before dealing with it

Darkness does not mean that things are completely broken.EssenceEssence