C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 25/13 (2006.01) C07C 17/00 (2006.01) C07C 17/361 (2006.01) C07C 17/33 (1990.01)
Patent
CA 2070386
Process for the preparation of fluorobenzenes and fluoro- toluenes Abstract A process for the preparation of fluorobenzenes and fluorotoluenes of the formula (I), in which X is H or a methyl group, R1, R2 and R3 are, independently of each other, at least one of the radicals H, F, Cl and C1-C3- alkyl, at least one of these radicals being fluorine, and S1 and S2 are, independently of each other, H and/or radicals which reduce the electron density at the benzene nucleus, but preferably H, characterized in that benzal- dehydes of the formula (II) in which R1, R2, R3, S1 and S2 have the meaning given above, are reacted of a catalyst, activated by treatment with hydrogen, comprising at least one transition metal of subgroups VII to VIII of the Periodic-Table, at 150 to 600°C.
Leupold Ernst I.
Litterer Heinz
Sistig Frank P.
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
Leupold Ernst I.
Litterer Heinz
Sistig Frank P.
LandOfFree
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