Synthesis and Reactivity of Trinuclear Gold(III) Dithiolate Complexes. X-ray Structure of [Au(C6F5)(S2C6H4)]3 and [Au(C6F5)(S2C6H4)(SC6H4SPPh3)]
摘要:
Q(2)[Zn(S-S)(2)] or [SnMe(2)(S-S)] (Q = NBu(4) or PPN, S-S = S2C6H4, S2C6H3CH3, or C3S5 (dmit)) reacts with trans-[Au(C6F5)Cl-2(tht)] affording trinuclear species [Au(C6F5)(S-S)](3) (1-3). When [AuX(3)(tht)] (X = Cl or Br) are used instead, [AuBr(S-S)], (4-6) and [AuCl(dmit)](n) (7) are obtained. Complex 1 further reacts with PPh(3) to give [Au(C6F5)(S2C6H4)(SC(6)H(4)SPPh(3))]. Complexes 1-3 react with neutral (pyridine) or anionic (Cl, Br, or SCN) ligands affording [Au(C6F5)(S-S)(py)] (9a-c) or Q[Au(C6F5)(S-S)X] (10a-c-12a-c) complexes. The structures of 1 and 8 have been established by X-ray crystallography. Complex 1 shows a six-membered Au3S3 ring which adopts a chair configuration and shows a gold-gold distance of 3.515 Angstrom. Complex 8 is a mononuclear square-planar gold(III) complex with a new SC(6)H(4)SPPh(3) thiolate ligand, the P-S bond length being 2.058(5) Angstrom.
Room-Temperature Gold-Catalysed Arylation of Heteroarenes: Complementarity to Palladium Catalysis
作者:Alexander J. Cresswell、Guy C. Lloyd-Jones
DOI:10.1002/chem.201602893
日期:2016.8.26
Tailoring of the pre‐catalyst, the oxidant and the arylsilane enables the first room‐temperature, gold‐catalysed, innate C−H arylation of heteroarenes. Regioselectivity is consistently high and, in some cases, distinct from that reported with palladium catalysis. Tolerance to halides and boronic esters, in both the heteroarene and silane partners, provides orthogonality to Suzuki–Miyaura coupling.
Oxidative 1,2-Difunctionalization of Ethylene via Gold-Catalyzed Oxyarylation
作者:Matthew J. Harper、Edward J. Emmett、John F. Bower、Christopher A. Russell
DOI:10.1021/jacs.7b06668
日期:2017.9.13
Under the conditions of oxidative gold catalysis, exposure of ethylene to aryl silanes and alcohols generates products of 1,2-oxyarylation. This provides a rare example of a process that allows catalytic differential 1,2-difunctionalization of this feedstock chemical.
Gold-Catalyzed Oxidative Coupling of Arenes and Arylsilanes