Synthesis of bis(σ-aryl)dirhodium(III) caprolactamates by oxidative arylation with arylboronic acids

摘要

Recently discovered stable bis(σ-phenyl)dirhodium(III) caprolac-tamate and its substituted derivatives are conveniently prepared in high yields from dirhodium(II) caprolactamate and commercially available arylboronic acids in a copper-catalyzed process. We recently reported the discovery of bis(phenyl)dirhodiu-m(III) caprolactamate (1), and characterized this novel di-nuclear paddlewheel complex as the first unequivocal example of a dirhodium(III) compound. Extensive analyses established that 1 does not have a metal-metal bond. Although dimeta-l(III) compounds exist, few have metal-carbon bonds with the most extensive listings being those of ruthenium and osmium. Diruthenium(III) organometallic structures have been constructed from 1-alkynes and stable diruthenium(III) compounds, and they have shown potential as molecular wires.