Metallabenzenes and valence isomers. 5. Synthesis and structural characterization of a rhodabenzvalene: A rare eta(2)-cyclopropene/sigma-vinylrhodium(I) complex

摘要

Treatment of cis-1,2-diphenyl-3-(2-lithioethenyl)cyclopropene (2) with (Me3P)(2)Rh(CO)Cl gives the corresponding rhodabenzvalene 5, which contains rare eta(2)-cyclopropene and sigma-vinylic linkages to Rh. The successful preparation of this metallacycle can be attributed to the synergistic combination of intramolecular pi-bonding of the cyclopropene and sigma-vinylic linkage to the Rh atom, both of which in turn inhibit decomposition of the other respective moiety. [References: 26]