title: Grubbs and Hoveyda-Type Ruthenium Complexes Bearing a Cyclic Bent-Allene.
abstract: Stable cyclic bent-allene 1 displaces the chelating ether linkage of the Hoveyda-Grubbs-type ruthenium complex 2 bearing triphenylphosphine. The resulting complex 3 features an unusual cis-arrangement of the phosphine and the cyclic bent-allene, while retaining a distorted square pyramidal geometry around the ruthenium center. Monitoring by (31)P NMR spectroscopy the reaction of cyclic bent-allene 1 with the indenylidene bis(triphenylphosphine)ruthenium dichloride complex 4 allowed for the observation of dissociated triphenylphosphine, and the formation of a ruthenium complex featuring 1 and triphenylphosphine in the desired trans-configuration. However, continued reaction times saw the disappearance of this complex, and after workup complex 5 featuring a cis-arrangement was isolated.
authors.affiliation: UCR-CNRS Joint Research Chemistry Laboratory (UMI 2957), Department of Chemistry, University of California, Riverside, CA 92521-0403 (USA).
authors.forename: Alan
authors.initials: A
authors.lastname: Dehope
authors.forename: Bruno
authors.initials: B
authors.lastname: Donnadieu
authors.forename: Guy
authors.initials: G
authors.lastname: Bertrand