Ah, straight to the point—good. In the plant, we make chlorobenzene from aniline via the Sandmeyer reaction every week: diazotize, then use CuCl. But for bromo, we often use the Gattermann reaction with CuBr; it’s cheaper at our scale. Skip making cyanobenzene yourself—just buy phenyl cyanide, the yield isn’t worth the hazard handling. You see, our client needed fifty kilos yesterday, so we don’t have time for textbook perfection, only what works reliably in the vat.
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