Unusual aryl–aryl coupling of 6-bromo-1,2-naphthoquinone to 6,6'-dibromo-1,1',2,2'-tetrahydroxy-4,4'-binaphthyl in the presence of trialkylphosphine and water
Аннотация:
The reaction of 6-bromo-1,2-naphthoquinone with tri(2-cyanoethyl)phosphine or tricyclohexylphosphine leads to the unusual formation of 6,6'-dibromo-1,1',2,2'-tetrahydroxy-4,4'-binaphthyl; its structure was confirmed by NMR spectroscopy and single crystal X-ray diffraction analysis.