Strong intramolecular calcium–π interactions with aryl substituents – requirements and limitations
作者:Claas Loh、Susanne Seupel、Alexander Koch、Helmar Görls、Sven Krieck、Matthias Westerhausen
DOI:10.1039/c4dt00949e
日期:——
are deprotonated with KN(SiMe3)2, yielding potassium N-(2,6-diisopropylphenyl)-N′-(8-quinolyl)pivalamidinate (2a) and potassium N-(2,6-diisopropylphenyl)-N′-(2-pyridyl)pivalamidinate (2b). Metalation of 1a with [(thf)2CaN(SiMe3)2}2] in tetrahydrofuran (thf) leads to the formation of ether-free calcium bis[N-(2,6-diisopropylphenyl)-N′-(8-quinolyl)pivalamidinate] (3a) with a strong intramolecular calcium–π
ipp Dipp–N C(t Bu)–N(H)–Qu(1a)(Dipp = 2,6-二异丙基苯基,Qu = 8-喹啉基)和Dipp–N C(t Bu)–N(H)–将Py(1b)(Py = 2-吡啶基)用KN(SiMe 3)2去质子化,得到N-(2,6-二异丙基苯基)-N '-(8-喹啉基)新戊二酸钾(2a)和N -(( 2,6-二异丙基苯基)-N '-(2-吡啶基)新戊二酸酯(2b)。[[thf)2 Ca N(SiMe 3)2 } 2的1a的金属化四氢呋喃(thf)中的]导致形成无醚的双[ N-(2,6-二异丙基苯基)-N '-(8-喹啉基)新戊二酸酯](3a),具有强的分子内钙-π相互作用,浸组。此外,与一个叔丁基取代基的原子键完成了金属中心的配位球并稳定了这种键合情况。2b与[(thf)4 CaI 2 ]的复分解反应生成双[ N-(2,6-二异丙基苯基)-N '-(2-吡啶基)新戊二