The concise synthesis of axially chiral biaryl diphosphine ligands by the rhodium-catalyzed intramolecular [2 + 2 + 2] cycloaddition of hexayne diphosphine oxides has been achieved. These new chiral diphosphine ligands could be employed as a ligand for the rhodium-catalyzed asymmetric catalyses.
It has been established that a cationic rhodium(I)/H8-binap complex is able to catalyze the [2+2+2] cycloaddition of diynes with carbodiimides and carbon dioxide under ambient conditions. Enantio- and/or regioselective variants of these reactions are also disclosed.
We construct a photoinduced methane hydroxylation system by the combination of thylakoid and methane monooxygenase from Methylosinus trichosporium OB3b.
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