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US 6,441,248 B1Granted
Preparation of biphenols by oxidative coupling of alkylphenols using copper catalyst
AssigneeWiley Organics, Inc.
InventorGregory Kaplan
Life of this patent
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Abstract
This invention relates to a method for producing biphenols by oxidative coupling of dialkylphenols which proceeds in two stages using a copper amine complex which is catalytically effective in each stage.
Claims10
A two-step process for preparing tetraalkylbiphenols which comprises:
- oxidizing a 2,4-dialkyl phenol and/or a 2,6 dialkylphenol with oxygen in the presence of a copper-amino complex to produce a tetraalkyldiphenoquinone, and reducing the tetaalkyldiphenoquinone with a 2,4-dialkylphenol and/or a 2,6-dialkylphenol in the presence of the copper-amino complex to produce the tetraalkylbiphenol.
Dependencies are inferred from the claim text.