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US 4,361,708 AGranted
Formation of biphenols
AssigneeThe Dow Chemical Company
InventorRobert M. Strom
Life of this patent
Estimating the term…
Abstract
Substituted biphenols are produced by heating substituted phenols in nitrobenzene solvent in the presence of a heterogeneous oxidative coupling catalyst without the addition of oxygen-containing gas.
Claims9
A process for producing biphenol carbon-carbon coupled condensation products of a substituted phenol of the formula:
- ##STR2## wherein each R is hydrogen, halogen, or R.sub.1 ;
- and each R.sub.1 is a substituent having up to 10 carbons selected from the group consisting of hydrocarbon, halohydrocarbon, and hydrocarbonoxy comprising contacting the substituted phenol at an elevated temperature with nitrobenzene under an inert atmosphere in the presence of a heterogeneous oxidative coupling catalyst capable of catalyzing the coupling reaction selected from the group consisting of platinum, palladium, ruthenium, rhodium, irridium, metals of group VII and IB of the Periodic Table, chromium, molybdenum, zinc and mixtures thereof present in a valence suitable for causing the carbon-carbon coupling of the pheolic compound.
Dependencies are inferred from the claim text.