The catalytic activity of a set of mono- and bimetallic Rh(I) and Ir(I) complexes bearing carbene-linker-carbene (CXC) bis-triazolylidene ligands (with X = O, N) coordinated in a bridging or chelating fashion was evaluated in the hydrothiolation of alkynes. The hydrothiolation of 1-hexyne with thiophenol in the absence of an external base or other additives was selected as a model reaction. All rhodium complexes are highly selective catalysts towards Markovnikov product formation and display superior activity compared to the related iridium derivatives. DFT calculations were carried out to rationalize the reaction mechanism and selectivity of this process. Neutral dinuclear [Rh₂Cl₂(cod)₂(μ-COC)] was found to be the most effective catalyst for this transformation. Its applicability was further studied towards the hydrothiolation of different alkyl and aryl alkynes using predominantly aryl thiols and proved to be one of the most active and selective catalysts towards the α-vinyl sulfide product to date.

中文翻译：

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卡宾-连接基-卡宾（CXC）铑和铱配合物介导的炔烃催化转化为α-乙烯基硫化物

一组带有桥联或螯合方式配位的卡宾-接头-卡宾（CXC）双三唑基亚配体（X = O，N）的单金属和双金属Rh（I）和Ir（I）配合物的催化活性为在炔烃的氢硫醇化反应中进行了评估。在不存在外部碱或其他添加剂的情况下，将1-己炔与苯硫酚进行氢硫醇化反应作为模型反应。与相关的铱衍生物相比，所有铑络合物都是对马尔可夫尼科夫产物形成具有高度选择性的催化剂，并显示出优异的活性。进行DFT计算以合理化该过程的反应机理和选择性。中性双核[Rh ₂ Cl ₂（cod）₂（μ- COC）]被发现是这种转化的最有效催化剂。进一步研究了其适用性，主要使用芳基硫醇对不同的烷基和芳基炔烃进行加氢硫醇化反应，并被证明是迄今为止对α-乙烯基硫化物产物最具活性和选择性的催化剂之一。