The complexes [Fe 2 {µ-CN(Me)(R)}(µ-CO)(CO)(NCMe)(Cp) 2 ][SO 3 CF 3 ] (R ) Xyl, 1a; R ) Me, 1b; R ) CH 2 Ph, 1c; Xyl ) 2,6-Me 2 C 6 H 3 ), containing a labile NCMe ligand, react under mild conditions with a variety of terminal alkynes HCtCR′ (R′) SiMe 3 , Me, Bu n , Tol, Ph, H; Tol ) 4-MeC 6 H 4 ) to give the bridging vinyliminium complexes [Fe 2 {µ-σ: 7). Insertion of the alkyne into the metal-carbyne carbon bond is regiospecific, resulting only in the product containing the R′ group on the carbon bound to Fe. Similarly, insertion of the disubstituted alkynes R′CtCR′ (R′ ) Me, Et) affords the analogous compounds [Fe 2 {µ-σ:). The molecular structure of complex 2a has been elucidated by an X-ray diffraction study.
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