Base-promoted intramolecular hydroalkylation of the carbon−carbon triple bond in the ruthenium
bis(arene) complexes [(p-cymene)Ru(η
6-C6H5C⋮CR)][OTf]2 (1, R = Et; 2, R = Ph; OTf = O3SCF3) generates
the strained [3]ruthenocyclophane complexes 3 and 4,
in which a propenyl (−CH2CRCH−) group bridges the
two arene ligands. The presence of the propenyl bridge
results in a bent-metallocene structure for the [3]ruthenocyclophane cation in 4, with an angle of 11.8°
between the arene ligands.
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