Abstract
The Ru[double bond, length as m-dash]P double bond in the 5-coordinate terminal phosphido complex [Ru(eta(5)-indenyl)(PR(2))(PPh(3))] undergoes regioselective [2+2] cycloaddition with simple and activated alkynes to give metallaphosphacyclobutene complexes. These unusual examples of alkyne insertion into a metal-heteroatom bond represent potentially important intermediates in stereoselective routes to new phosphine reagents and ligands.
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