Process for the preparation of halobenzaldehydes

Details Process for the preparation of halobenzaldehydes Process for the preparation of halobenzaldehydes

1996-01-26

1997-07-15

Geist, Gary

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

Organic compounds

Oxygen containing

568437, C07C 4536

Patent

active

056485514

ABSTRACT:
The invention relates to a process for the preparation of halobenzaldehydes of the formula (I): ##STR1## in which Hal is fluorine, chlorine, bromine or iodine and z=1, 2, 3 or 4, by catalytic gas-phase oxidation of a substituted toluene of the formula (II), ##STR2## by oxygen, which comprises carrying out the oxidation in the presence of a catalyst of the formula (III)

REFERENCES:
patent: 4390728 (1983-06-01), Daniel
patent: 4885412 (1989-12-01), Pennington et al.
patent: 5136104 (1992-08-01), Saito et al.
Chemical Abstracts, vol. 080. No. 21; May 27, 1974; Columbus, Ohio, US; abstract No. 119931; Chopra B et al; "Oxidation of chlorotoluenes on bismuth oxide-molybdenum oxide"; p. 360.

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