Bisbiphenyl Phosphines: Structure and Synthesis of Gold(I) Alkene π‑Complexes with Variable Phosphine Donicity and Enhanced Stability

This paper describes the synthesis and characterization of RP­(o-biphenyl)2 phosphine ligands (where R = PhO, Ph, and t-Bu), corresponding gold­(I) chloride precatalysts, gold­(I) triflate catalysts, and gold­(I) π-complexes. All ligands and gold chlorides and three π-complexes were characterized in...

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Veröffentlicht in:Organometallics 2020-07, Vol.39 (14), p.2665-2671
Hauptverfasser: Griebel, Carolin, Hodges, Dwaine D, Yager, Brock R, Liu, Fred L, Zhou, Wentong, Makaravage, Katarina J, Zhu, Yuyang, Norman, Skylar G, Lan, Ruichen, Day, Cynthia S, Jones, Amanda C
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Sprache:eng
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Zusammenfassung:This paper describes the synthesis and characterization of RP­(o-biphenyl)2 phosphine ligands (where R = PhO, Ph, and t-Bu), corresponding gold­(I) chloride precatalysts, gold­(I) triflate catalysts, and gold­(I) π-complexes. All ligands and gold chlorides and three π-complexes were characterized in the solid state. The most significant differences between complexes in the solid state were varying P–Au bond lengths, a consistent reflection of the different electronic character of each phosphine. NMR spectroscopic data on enol ether π-complexes is consistent with increasing cationic character in the alkene fragment, from R = t-Bu to R = Ph and OPh. The intermolecular alkene exchange process for [LAu­(methoxypropene)]­SbF6 (L = PhO­(o-biphenyl)2P) is faster than that of the analogous complex with t-Bu2(o-biphenyl)­P, presumably due to the higher electrophilicity of the former complex. Examination of a series of vinyl silane π-complexes with triaryl phosphine ligands reveals increasing stability and ease of preparation (Ph3P < Ph2P­(o-biphenyl) < PhP­(o-biphenyl)2). These results reveal that incorporation of a second biphenyl substituent into ligand architectures allows preparation of a series of gold π-complexes with increased stability over a range of phosphine donicity.
ISSN:0276-7333
1520-6041
DOI:10.1021/acs.organomet.0c00278