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Reactivity of an NHC-Coordinated Trisilacyclopropylidene with Transition Metal Carbonyl Compounds
Organometallics ( IF 2.5 ) Pub Date : 2020-11-25 , DOI: 10.1021/acs.organomet.0c00607
Benedikt J. Guddorf 1 , Milica Feldt 2 , Alexander Hepp 1 , Constantin G. Daniliuc 2 , Felicitas Lips 1
Affiliation  

The reaction of the NHC-coordinated trisilacyclopropylidene F with freshly prepared W(CO)6–n(thf)n (n = 1, 2) yielded in addition to the targeted tungsten pentacarbonyl complex 1 the unexpected NHC-coordinated Si3W-heterocycle 2 via oxidative insertion of a W(CO)4 unit into the peripheral Si–Si single bond of F. The structurally analogous insertion product 3 is selectively accessible by reacting F with Mo(CO)4(nbd) in 71% yield. Moreover, F reacts selectively with Fe2(CO)9 giving rise to the iron tetracarbonyl complex 4 that can either thermally or photolytically be converted under release of one equivalent of carbon monoxide into the NHC-coordinated Si3Fe-heterocycle 5 featuring a butterfly-type structural motif. FT-IR spectroscopy and DFT calculations of 1 and 4 reveal strong σ-donor and negligible π-acceptor properties of F. Natural bond orbital analysis (NBO) and quantum theory of atoms in molecules (QTAIM) of 2, 3, and 5 give evidence for weak transannular interactions in 2 and 3 and the presence of a transannular bond in 5.

中文翻译:

NHC配位的三硅环亚丙基与过渡金属羰基化合物的反应性

NHC配位的三硅丙环亚丙基F与新制备的W(CO)6– n(thf)nn = 1,2)的反应,除得到目标的五羰基钨配合物1外,还产生了NHC配位的Si 3 W杂环。2经由W(CO)的氧化插入4单元进入的周的Si-Si单键˚F。通过使F与Mo(CO)4(nbd)反应,可以71%的产率选择性地获得结构相似的插入产物3。另外,F与Fe 2选择性反应(CO)9产生四羰基铁络合物4,该四羰基铁络合物在一当量的一氧化碳释放下可以被热或光解转化为具有蝴蝶型结构基序的NHC配位的Si 3 Fe-杂环514的FT-IR光谱和DFT计算表明F的强σ供体和π受体性质可忽略不计。自然键轨道分析(NBO)和在分子中的原子的量子论的(QTAIM)235提供证据为在弱跨环相互作用23并在5中存在跨环键。
更新日期:2020-12-14
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