化学
环加成
位阻效应
区域选择性
蒽
配体(生物化学)
苯
立体化学
药物化学
光化学
有机化学
催化作用
生物化学
受体
作者
Debotra Sarkar,Petra Vasko,Aisling Roper,Agamemnon Crumpton,Matthew M. D. Roy,Liam Griffin,Charlotte Bogle,Simon Aldridge
摘要
The large steric profile of the N-heterocyclic boryloxy ligand, –OB(NDippCH)2, and its ability to stabilize the metal-centered HOMO, are exploited in the synthesis of the first example of a "naked" acyclic aluminyl complex, [K(2.2.2-crypt)][Al{OB(NDippCH)2}2]. This system, which is formed by substitution at AlI (rather than reduction of AlIII), represents the first O-ligated aluminyl compound and is shown to be capable of hitherto unprecedented reversible single-site [4 + 1] cycloaddition of benzene. This chemistry and the unusual regioselectivity of the related cycloaddition of anthracene are shown to be highly dependent on the availability (or otherwise) of the K+ countercation.
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