Transition-Metal-Promoted Ring-Opening Reactions of Vinylcyclopropenes. 1,2,3,5-Eta-Penta-2,4-dienediyl and 1,5-Eta-Penta-2,4-dienediyl (1-Metallacyclohexa-2,4-diene) Complexes of Rhodium(III) and Iridium(III) and Their Conversion

摘要

1, 2, 3-Triphenyl-3-vinyl-1-cyclopropene (2) reacts with MCI (PMe3)2 (M = Rh, Ir) to give novel complexes 3a, b containing the 1, 2, 3, 5-n-penta-2, 4-dienediyl ligand, one of which, the iridium species 3b, has been crystallographically characterized. In contrast, reaction of 2 with the bulkier reagent RhC1 (P-i-Pr3)2 yields directly the (cyclopentadienyl) hydridorhodium complex 6. Reaction of 3z with (acetylacetonato) thallium affords the (1,5-n-penta-2, 4-dienediyl) rhodium (1-rhodacyclohexa-2, 4-diene) complex 8 which has also been crystallographically characterized.