Abstract
Multiple Bonds Between Main‐Group Elements and Transition Metals, LXXXII. — Dinuclear p‐Benzylidyne Complexes Having a Double Bond between Rhenium AtomsThe dialkylrhenium(V) complex (η5‐C5Me5)Re(O)(CH2Ph)2 (3) reacts with the organotitanium reagents (η5‐C5H5)TiX3 (X Cl, Br) to yield the dinuclear rhenium(IV) complexes (η5C5Me5)2 Re2X3(CC6H5) (4a, b). According to a single‐crystal X‐ray diffraction analysis, 4a′ (C5Me4Et in place of C5Me5) represents one of the few known examples of μ‐alkylidyne complexes that have metal‐to‐metal multiple bonds. The molecule of C2 symmetry has a planar four‐membered Re,Cl,Re′,C‐ring geometry and two trans‐oriented sets of ligands. Very small angles at the bridging chloro ligand and alkylidyne carbon atom result from the short metal‐metal distance (double bond).
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