Synthesis of Ruthenium Boryl Analogues of the Shvo Metal-Ligand Bifunctional Catalyst.

Synthesis of Ruthenium Boryl Analogues of the Shvo Metal-Ligand Bifunctional Catalyst.
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DOI:
10.1021/om1005808
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发表时间:
2010
期刊:
影响因子:
2.8
通讯作者:
Clark TB
Clark TB
中科院分区:
化学2区
文献类型:
--
作者:
Koren-Selfridge L;Query IP;Hanson JA;Isley NA;Guzei IA;Clark TB

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近年来,金属硼基配合物由于其在许多金属催化的硼化反应中作为关键中间体的作用而在文献中受到显著关注。已知配体骨架对这些金属硼基络合物的观察到的反应性具有显著影响。一种合成策略,以获得钌硼类似物的Shvo金属配体催化剂进行了描述。在50 °C下加热Shvo催化剂(1)的前体与双(邻苯二酚合)二硼,得到钌硼基络合物3 [2,5-Ph 2 - 3,4-Tol 2(η5-C4 COBcat)Ru(CO)2Bcat](Bcat =邻苯二酚合硼基)。在苯酚的存在下,向配合物1中加入双(邻苯二酚)二硼,在22 °C下以30%的分离产率产生钌硼基配合物5 [2,5-Ph 2 - 3,4-Tol 2(η5-C4 COH)Ru(CO)2Bcat]。配合物5的单晶X射线分析证实了指定的结构。通过原位生成配合物3 [2,5-Ph_2 - 3,4-Tol_2(η_5-C_4COBcat)Ru(CO)_2Bcat],再加入苯酚,改进了钌硼基配合物5的合成方法,产率为51%。
Metal boryl complexes have received significant attention in the literature in recent years due to their role as key intermediates in a number of metal-catalyzed borylation reactions. The ligand scaffold is known to have a significant impact on the observed reactivity of these metal boryl complexes. A synthetic strategy to access ruthenium boryl analogues of the Shvo metal–ligand catalysts is described. Heating a precursor to Shvo’s catalyst (1) with bis(catecholato)diboron at 50 °C provided ruthenium boryl complex 3 [2,5-Ph2-3,4-Tol2(η5-C4COBcat)Ru(CO)2Bcat] (Bcat = catecholatoboryl). Addition of bis(catecholato)diboron to complex 1 in the presence of a phenol results in ruthenium boryl complex5 [2,5-Ph2-3,4-Tol2(η5-C4COH)Ru(CO)2Bcat] at 22 °C in 30% isolated yield. A single crystal X-ray analysis of complex 5 confirmed the assigned structure. An improved synthesis of ruthenium boryl complex 5 was developed by the in situ formation of complex 3 [2,5-Ph2-3,4-Tol2(η5-C4COBcat)Ru(CO)2Bcat] followed by addition of the phenol, resulting in a 51% yield.
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