Unprecedented reactions of alkynes with η2-CS2 metal complexes

Abstract

Alkynes react with [Mo(η⁵-C₅H₅)₂(η²-CS₂)](1) to afford heterocycle derivatives [(η⁵-C₅H₅)₂[graphic omitted]R][(2) R = CF₃; (3) R = CO₂Me] and [(η⁵-C₅H₅)₂[graphic omitted]R][(4) R = CO₂Me], and both (2) and (3) react with HCC–CN to yield [(η⁵-C₅H₅)[graphic omitted]R}][(5) R = CO₂Me; (6) R = CF₃], while treatment of (1) with HCC–CN gives an unprecedented metallacycle [(η⁵-C₅H₅)₂Mo(C₁₀H₃N₃S₂)](7), corresponding to the addition of three alkynes to CS₂; the structures of (4), (5), and (7) have been established by X-ray crystallography.