Process for preparing aromatic fluorides

Details Process for preparing aromatic fluorides Process for preparing aromatic fluorides

C - Chemistry, Metallurgy

07

C

260/653.6

C07C 25/13 (2006.01) C07B 39/00 (2006.01) C07C 17/093 (2006.01)

Patent

CA 1289152

Abstract of the Disclosure An improved process is disclosed for preparing aromatic fluorides by diazotization-fluorination in hydrogen fluoride wherein the diazotized reaction mixture includes an oxidizing agent such as nitrosonium ion from excess diazotization agent. The improvement includes, prior to decomposing the diazonium fluoride, adding to the diazotized reaction mixture a member selected from hydrazine, aromatic hydrazine, semi-carbazide, thio- semicarbazide, acid salts thereof, sulfur dioxide, sodium sulfite, and sodium bisulfite to remove at least a portion of the oxidizing agent. Urea was found to be ineffective.

563426

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