摘要:
A process for preparing unsymmetric biphenols, comprising: a) adding a first substituted phenol to the reaction mixture; b) adding a second substituted phenol having different substitution than the first phenol to the reaction mixture; c) adding selenium dioxide to the reaction mixture; d) adding a solvent; and e) heating the reaction mixture such that the first substituted phenol and the second phenol having different substitution are converted to an unsymmetric biphenol.
摘要:
A process for preparing a 2,2′-selenobiaryl ether or a 4,4′-selenobiaryl ether, proceeds by a) adding a first phenol to the reaction mixture, b) adding a second phenol to the reaction mixture, c) adding selenium dioxide to the reaction mixture, d) adding a base having a pKb in the range from 8 to 11 to the reaction mixture, and e) adjusting the reaction temperature of the reaction mixture such that the first phenol and the second phenol are converted to said 2,2′-selenobiaryl ether or said 4,4′-selenobiaryl ether.
摘要:
A process for preparing a 2,2′-biphenol, proceeds by a) adding a first phenol to a reaction mixture, b) adding a second phenol to the reaction mixture, c) adding selenium dioxide to the reaction mixture, d) adding an acid having a pKa in the range from 0.0 to 5.0 to the reaction mixture, and e) heating the reaction mixture such that the first phenol and the second phenol are converted to said 2,2′-biphenol.
摘要:
An electrochemical method for coupling anilines. When coupling two different anilines, the difference of the oxidation potential of the substrates is in the region of between 10 mV to 450 mV, and the aniline with the highest oxidation potential is added in excess. The method allows biaryldiamines to be electrochemically produced, and can avoid the need for multi-step syntheses using metallic reagents.
摘要:
An electrochemical treatment of differently protected aniline or napthylamine results in the preparation of unsymmetrical 2, 2′-diaminebiaryls provided with different protecting groups. The treatment involves the protecting groups prior to the C, C coupling step. The co-reactants generally have different oxidation potentials which results from the selection of the protecting groups. The treatment also enables controlled access to the individual amino functions of the 2, 2′-diaminobiaryls by subsequent selective deprotection.
摘要:
Electrochemical process for coupling two phenols of different oxidation potential, and novel biphenols which can be prepared by this electrochemical coupling.
摘要:
The invention relates to an electrochemical method for the selective coupling of a phenol to a naphthol which differ in their oxidation potential. The invention also relates to compounds which can be produced by electrochemical coupling.
摘要:
An electrochemical method for C—C coupling a phenol and an aniline in a reaction vessel containing a suitable solvent or solvent mixture and a conductive salt to produce biaryls having both hydroxyl and amino functions, wherein the difference in the oxidation potentials ΔE of the substrates ranges from 10 mV to 450 mV and the substrate with the highest oxidation potential is in excess, which method dispenses with multi-step syntheses using metallic reagents.