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Periodic Classification of the Elements

Periodic Classification of the Elements

The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...

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Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes

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开的早期兰化物终端伊米德

Theresa E Rieser¹, Renita Thim-Spöring¹, Dorothea Schädle¹

¹Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany.

Journal of the American Chemical Society

|February 25, 2022

概括

此摘要是机器生成的。

研究人员用一种新的甲消除反应合成了新型终端兰化物 (Ln) 胺为开酸Ce (III),Nd (III) 和Sm (III). 这一突破克服了先前合成这些重要的有机金属化合物的局限性.

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科学领域:

有机金属化学
兰化物化学
无机合成

背景情况:

兰化物 (Ln) 的有机金属化学是由离子大小,电子阴性和易斯酸度决定的.
合成较小的Ln离子 (Sc (III),Lu (III),Y (III)) 和Ce (IV) 的终端胺基[LnNR]需要特殊的协议.
较大的,开的Ln(III) 离子 (Ce(III,Nd(III,Sm(III)) 的终端胺很难合成.

研究的目的:

报告开封兰酸Ce (III),Nd (III) 和Sm (III) 的终端化物合成情况.
研究这些新型有机金属复合物的形成因素.
探索这些胺复合物的反应性和稳定性.

主要方法:

易斯酸稳定甲基复合物[TpLn(μ₃-CH₂) {(μ₂-Me) MMe₂}₂ (Ln = Ce, Nd, Sm; M = Al, Ga) 与2,6-二烯 (H₂NAr^{) 的反应.}
甲消除反应形成阿里利米德复合物.
基于反应条件的产品特征,包括金属标识 (M = Al,Ga),溶剂和氨基性质.

主要成果:

对于Ln=Ce,Nd,Sm,只有当M=Ga时,成功合成终端阿里利米德[TpLn(NAr)
在M = Al时形成持久的易斯酸稳定化化物[TpLn(NAr)
在非协调溶剂中观察到Ln = Nd,Sm的[GaMe₃]稳定化化物[TpLn(NAr^{) 的可逆形成.}

结论:

一个新的反应协议使得以前难以捉摸的开兰坦化物终端胺的合成成为可能.
这些胺基的形成和稳定性严重依赖于丁离子,易斯酸和氨基的固态/电子性质.
这项工作扩大了兰化物有机金属化学的范围,并提供了新的反应性中间体.