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Synthesis and Reactivity of Aluminum Disilacyclopropenes. Cyclic AlSi2 Delocalized 2π Systems
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2023-12-14 , DOI: 10.1021/jacs.3c09358
Lulu Guo 1 , Jianying Zhang 1 , Chunming Cui 1, 2
Affiliation  

The synthesis, structures, and reactivity of the first unsaturated AlSi2 three-membered ring systems were described. Reactions of dilithiodisilene [(NHB)LiSi═SiLi(NHB)] (1, NHB = diazaborolyl) with aluminum halides AlCl3, Ar(SiMe3)NAlCl2 (Ar = 2,6-iPr2C6H3), Cp*AlBr2 (Cp* = C5Me5), and TipAlBr2·Et2O (Tip = 2,4,6-iPr3C6H2) led to the formation of AlSi2 three-membered ring species, solvated (NHBSi)2AlCl(OEt2) (2) and solvent-free (NHBSi)2AlN(SiMe3) Ar (3), (NHBSi)2AlCp* (4), and (NHBSi)2AlTip (5), in good yields. X-ray diffraction studies and DFT calculations disclosed delocalized AlSi2 2π electron systems. Methanolysis of 4a resulted in cleavage of the Al–Si σ and Si–Si π bonds, giving trihydrodisilane (NHB)H(MeO)SiSiH2 (NHB) (6). Reaction of 4b with 4 equiv of N2O and H2C═CH2 resulted in the insertion of four oxygen atoms and four H2C═CH2 π bonds into all of the Al–Si and Si–Si bonds, yielding the O- and CH2CH2-bridged polycyclic species 7 and 8, demonstrating the synergistic reactivity of the Al–Si and Si–Si bonds in the AlSi2 ring system.

中文翻译:


二硅杂环丙烯铝的合成和反应性。环状 AlSi2 离域 2π 系统



描述了第一个不饱和AlSi 2三元环体系的合成、结构和反应活性。二锂二硅烯 [(NHB)LiSi=SiLi(NHB)] ( 1 , NHB = 二氮杂硼基) 与卤化铝 AlCl 3 , Ar(SiMe 3 )NAlCl 2 (Ar = 2,6- i Pr 2 C 6 H 3 ) 的反应, Cp*AlBr 2 (Cp* = C 5 Me 5 ) 和 TipAlBr 2 ·Et 2 O (Tip = 2,4,6- i Pr 3 C 6 H 2 ) 导致 AlSi 2三元环物质的形成、溶剂化 (NHBSi) 2 AlCl(OEt 2 ) ( 2 ) 和无溶剂 (NHBSi) 2 AlN(SiMe 3 ) Ar ( 3 )、(NHBSi) 2 AlCp* ( 4 ) 和 (NHBSi) 2 AlTip ( 5) ),产量良好。 X 射线衍射研究和 DFT 计算揭示了离域 AlSi 2 2π 电子系统。 4a的甲醇分解导致 Al-Si σ 和 Si-Si π 键断裂,得到三氢二硅烷 (NHB)H(MeO)SiSiH 2 (NHB) ( 6 )。 4b与4当量的N 2 O和H 2 C=CH 2的反应导致四个氧原子和四个H 2 C=CH 2 π键插入到所有Al-Si和Si-Si键中,产生O-和CH 2 CH 2 -桥联多环物质78 ,证明了AlSi 2环系统中Al-Si和Si-Si键的协同反应活性。
更新日期:2023-12-14
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