Metallabenzenes and Valence Isomers. 5. Synthesis and Structural Characterization of a Rhodabenzvalene: A Rare η2-Cyclopropene/σ-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.