Process for preparing aromatic fluorides

Details Process for preparing aromatic fluorides Process for preparing aromatic fluorides

1988-04-05

1989-12-12

Higel, Floyd D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

534558, 534565, 534559, 534581, 570123, 570127, C07C 1722, C07C 2513, C07C 2518, C07D21302

Patent

active

048869201

ABSTRACT:
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 sulfate, and sodium bisulfite to remove at least a portion of the oxidizing agent. Urea was found to be ineffective.

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