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Simple Mercury-Free Synthesis and Characterization of Symmetric and Unsymmetric Mono- and Dialkynyl (tpy)Au(III) Complexes

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journal contribution
posted on 2020-07-28, 20:07 authored by Sina Witzel, Marte S. M. Holmsen, Matthias Rudolph, Martin C. Dietl, Sigurd Øien-Ødegaard, Frank Rominger, Mats Tilset, A. Stephen K. Hashmi
A highly efficient mercury-free route, providing [C^N] cyclometalated symmetric dialkynyl gold­(III) complexes with 2-(p-tolyl)­pyridine (tpy) as bidentate ligands and using alkynyllithium reagents, was developed. With 1,9-decadiyne, an unprecedented representative of a di­(bidentate) gold­(III) complex, for the first time became accessible. By using Grignard instead of the alkynyllithium reagents, we succeeded in synthesizing a range of novel monoalkynyl gold­(III) complexes in excellent yields (74–92%) and diastereoselectivity. Treating [(tpy)­Au­(CCTMS)2] with Bu4NF in THF gave a complete deprotection, and with K2CO3 in methanol, there was a selective deprotection of the TMS group trans to the pyridyl N atom, providing [(tpy)­Au­(CCH)­(CCTMS)] as the major product. This new type of cyclometalated gold­(III) complex bears two different alkynes as ancillary ligands. The further functionalization of the monoalkynyl (tpy)­gold­(III) complexes was investigated, offering a universal unprecedented and diastereoselective access to unsymmetrical dialkynyl (tpy)­gold­(III) complexes.

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