Oxidation of alpha aryl alcohols
Abstract
Abstract A METHOD FOR THE OXIDATION OF ALPHA ARYL ALCOHOLS OR ETHERS THEREOF TO CARBONYLS, I.E. ALDEHYDES, KETONES OR ESTERS, IS DISCLOSED. THE REACTION COMPRISES OXIDATION OF THE ALPHA ARYL ALCOHOL OR ETHER UNDER MILD CONDITIONS COMPRISING A TEMPERATURE OF ABOUT 30* TO 300*C. AND A PRESSURE FROM 1 TO ABOUT 500 ATMOSPHERES, SUFFICIENT TO MAINTAIN A LIQUID PHASE REACTION SYSTEM. THE PRODUCT IS PRODUCED BY SELF-OXIDATION OF THE ALPHS ARYL OXY REACTANT OR BY OXIDATION IN THE PRESENCE OF AN OLEFIN. THE CATALYST FOR THIS REACTION IF A GROUP VIII NOBLE METAL WHICH IS COMPLEXED WITH A BIPHYLIC LIGAND, TYPICALLY PALLADIUM OR RUTHENIUM COMPLEXED WITH TRIPHENYLPHOSPHINE. REACTION IN THE PRESENCE OF A STRONG ACID OR BASE WILL PRODUCE AN ESTER OF AN AROMATIC ACID AND CARBINOL. SIDE REACTIONS SUCH AS DECARBONYLATION CAN BE SUPPRESSED BY PERFORMING THE REACTION IN THE PRESENCE OF CARBON MONOXIDE OR AN ALKALI METAL HYDROXIDE. DEHYDRATION OF THE ALCOHOL CAN ALSO BE REDUCED BY THE PRESENCE OF AN ALKALI METAL HYDROXIDE IN THE REACTION MEDIUM.
Inventors
- 👤 D Fenton
Bibliographic Details
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