Process for the preparation of o-hydroxy-benzaldehydes

Details Process for the preparation of o-hydroxy-benzaldehydes Process for the preparation of o-hydroxy-benzaldehydes

1991-04-05

1992-07-14

Lone, Werren B.

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

Organic compounds

Oxygen containing

568431, 568433, C07C 4536

Patent

active

051304937

ABSTRACT:
o-Hydroxy-benzaldehydes can be obtained by oxidation of the o-cresols, on which they are based, with oxygen in the presence of substances having a base reaction in a solvent if chelate complexes of iron, manganese or a mixuture of both with polyaza-macrocycles as chelating agents are employed as catalysts. Copper or a copper compound is advantageously added as a co-catalyst.

REFERENCES:
patent: 4429163 (1984-01-01), Nishizawa et al.
patent: 4453016 (1984-05-01), Au et al.
patent: 4471140 (1984-09-01), Au
patent: 4481374 (1984-11-01), Christidis
patent: 4772754 (1988-09-01), Rohrscheid
patent: 4929766 (1990-05-01), Campo

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