Preparation of polyphenols by oxidation of hydroxybenzaldehydes

Patent · Tue Mar 06 00:00:00 EST 1984

OSTI ID:6358104

Formanek, K; Michelet, D; Petre, D

Optionally aldehyde substituted polyphenols are prepared by oxidizing, with hydrogen peroxide, a hydroxybenzaldehyde bearing at least one aldehyde substituent ortho- and/or para- to the nuclear hydroxyl group, in an aqueous reaction medium and in the presence of an alkali or alkaline earth metal base, the process being characterized in that the pH of the reaction medium is continuously maintained at a value no greater than 7 throughout the course of the oxidation reaction. The subject process is well suited for the preparation of, e.g., hydroxy-p-vanillin from guaiacol, and the novel compound 2,4,6-triformylphenol.

• Assignee: Rhone-Poulenc Industries (France)
• Patent Number(s): US 4435601
• OSTI ID: 6358104
• Resource Relation: Patent Priority Date: Priority date 7 Jul 1981, France; Other Information: PAT-APPL-281248
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
PHENOL
OXIDATION
POLYPHENOLS
CHEMICAL PREPARATION
AQUEOUS SOLUTIONS
CHEMICAL REACTION KINETICS
HYDROGEN PEROXIDE
METHYLATION
OXYGEN
PH VALUE
AROMATICS
CHEMICAL REACTIONS
DISPERSIONS
ELEMENTS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
KINETICS
MIXTURES
NONMETALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PEROXIDES
PHENOLS
REACTION KINETICS
SOLUTIONS
SYNTHESIS
020400* - Petroleum- Processing