lithium chloride; copper dichloride; bis(benzonitrile)palladium(II) dichloride in acetonitrile 44 h;

(-)-2,3-O-isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphanyl)butane; tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran 6 h; Ambient temperature; Yields of byproduct given;