Back to results
US 6,271,420 B1Granted
Preparation of quinonediimines from phenylenediamines using hydrogen peroxide and a catalyst
AssigneeFlexsys America L.P.
InventorRaymond A. Lohr
Life of this patent
Estimating the term…
Abstract
A phenylenediamine compound can be converted, with high selectivity, into its corresponding quinonediimine by reacting the phenylenediamine with hydrogen peroxide in the presence of a catalyst.
Claims22
A process for preparing a quinonediimine by reacting a corresponding phenylenediamine with hydrogen peroxide in the presence of a catalyst.
A process for preparing a quinonediimine by reacting the corresponding phenylenediamine with hydrogen peroxide in the presence of a catalyst wherein the phenylenediamine is an ortho- or para-phenylenediamine of the following Formula I:
- wherein R1, R2 and R3 are the same or different and are selected from hydrogen, hydroxyl, halogen, alkyl, alkoxy, aryl, aralkyl, alkaryl, cycloalkyl, heteroocycle, acyl, aroyl, carbamyl, carboxylic acids, esters, ethers, ketones, alcohols, thiols, alkylthiols, and cyano, and further wherein the resulting corresponding quinonediimine is of the following Formula IIa or IIb:
- wherein R1, R2 and R3 are the same as in the compound of Formula I, wherein the reaction takes place in a homogenous solvent system or in a two-phase solvent system comprising a water insoluble organic solvent and water.
Dependencies are inferred from the claim text.