Benzene fluoro-chromium

Fluorine atoms in electron-deficient benzene derivatives, such as l-fluoro-2-nitroben-zene,149-150 l-fluoro-4-nitrobenzene.151 153 2-fluorobenzaldchyde,154"156 2-fluoroaceto-phenone,155156 4-fluoroacetophenonc,157 2-fluorobenzophenone.156 2- and 4-fluorobenzoni-trile,158 and 4-fluorophenyl trifluoromethyl sulfone,152,159 are easily substituted by N-nucleophiles. Even fluorine in electron-deficient sandwich complexes, such as tricarbonyl(t/6-fluoro-benzene)chromium (3), is substituted by amines.160161... 

Fluorodecarboxylation of arylchloroformates in the vapour phase to give fluoro-benzene and its analogues can be achieved in high yield using anhydrous HF.199 Reaction occurs quickly at 300—400 °C using chromium and aluminium oxyfluoride. The effects of micelles on the decarboxylation of /i-aminosalicylic acid (224) have been examined.200... 

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