Synthesis and Reactivity of Molybdenum and Tungsten Alkyne Complexes Containing 6‐Methylpyridine‐2‐thiolate Ligands

Abstract A series of M(II) and M(IV) (M=Mo, W) alkyne adducts employing two 6‐methylpyridine‐2‐thiolate (6‐MePyS) ligands was synthesized investigated towards the nucleophilic attack PMe 3 on coordinated alkynes. For this approach, 2‐butyne (C 2 Me ), phenylacetylene (HC Ph), diphenylacetylene Ph ) were used. exploration an intramolecular attack, but‐3‐yn‐1‐ol (HCCCH CH OH) to metal centers. observed in [W(CO)(HC Ph)(6‐MePyS) ] yielding η ‐vinyl compound. Reaction [W(CO)(C )(6‐MePyS) with excess resulted selective coordination one molecule concomitant decoordination nitrogen atom 6‐MePyS ligand. In contrast, W(IV) complexes did not react . While no selectivity reaction Mo(II) compounds , alkynes Mo(IV) replaced by Addition Et N lead anticipated formation 2,3‐dihydrofuran.