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‐Bis(2,6‐diisopropylphenyl)benzamidinates and ‐pivalamidinates of the s‐Block Metals Lithium, Potassium, and Calcium
作者:Claas Loh、Susanne Seupel、Helmar Görls、Sven Krieck、Matthias Westerhausen
DOI:10.1002/ejic.201301557
日期:2014.3
6-diisopropylphenyl)benzamidinate] (4a). For the bulkier N,N′-bis(2,6-diisopropylphenyl)pivalamidinate, heteroleptic [(thf)Ca(Dipp-N)2C-tBu}N(SiMe3)2}] (4b) forms. Depending on the softness and charge-to-radius ratio, syn configuration of the amidinate ligands is observed for 2a, 4a, and 4b, whereas the anti configuration is realized in complexes 2b, 3a, and 3b, the latter being stabilized by intramolecular
N,N'-双(2,6-二异丙基苯基)苯甲脒 (1a) 和 -新戊脒 (1b) 在四氢呋喃 (THF) 中用正丁基锂和双(三甲基甲硅烷基)酰胺钾金属化得到相应的 N,N'-双(2,6-二异丙基苯基)苯甲脒和锂的-新戊酰胺,[(thf)2Li(Dipp-N)2C-Ph}] (2a)和[(thf)Li(Dipp-N)2C-tBu}] (2b) 以及钾的 [(thf)3K(Dipp-N)2C-Ph}] (3a) 和 [(thf)3K(Dipp-N)2C-tBu}] (3b) ( Dipp = 2,6-二异丙基苯基)。由于使用 [(thf)2CaN(SiMe3)2}2] 不可能对这些脒进行金属化,因此选择了复分解方法。因此,3a 与碘化钙在 THF 中的反应产生(四氢呋喃)双[N,N'-双(2,6-二异丙基苯基)苯甲脒](4a)钙。对于体积较大的 N,N'-双(2,6-二异丙基苯基)新戊酰胺酸酯,形成杂配位