Role of σ,π-Digold(I) Alkyne Complexes in Reactions of Enynes Sofia Ferrer Antonio M. Echavarren 10.1021/acs.organomet.7b00668.s001 https://acs.figshare.com/articles/journal_contribution/Role_of_-Digold_I_Alkyne_Complexes_in_Reactions_of_Enynes/5716255 Gold­(I) acetylide and σ,π-digold­(I) alkyne complexes derived from one prototypical 1,6-enyne and from 7-ethynyl-1,3,5-cycloheptatriene have been prepared and structurally characterized. Their possible role in gold­(I)-catalyzed cycloisomerizations has been studied by experiment and by DFT calculations. Gold­(I) acetylides are totally unproductive complexes in the absence of Brønsted acids. Similarly, no cyclizations were observed by heating σ,π-digold­(I) alkyne digold­(I) at least up to 130 °C. Theoretical studies provide a rationale for the much lower reactivity of digold species in reactions of enynes. 2017-12-19 16:19:06 enyne Br ønsted acids complex digold species DFT calculations Theoretical studies alkyne acetylide