2,2′-Bipyrrolidine versus 1,2-Diaminocyclohexane as Chiral Cores for Helically Wrapping Diamine−Diolate Ligands

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• 作者：Ekaterina Sergeeva ; Jacob Kopilov ; Israel Goldberg ; Moshe Kol
• 刊名：Inorganic Chemistry
• 出版年：2009
• 出版时间：September 7, 2009
• 年：2009
• 卷：48
• 期：17
• 页码：8075-8077
• 全文大小：677K
• 年卷期：v.48,no.17(September 7, 2009)
• ISSN：1520-510X

文摘

The synthesis of chiral tetradentate dianionic diamine−diolate ligands assembled around either N,N′-dimethyl-trans-1,2-diaminocyclohexane or 2,2′-bipyrrolidine is described. These ligands wrap in a fac−fac helical mode around octahedral titanium and zirconium centers giving chiral-at-metal complexes. Diaminocyclohexane was found to be a poor chiral motif for diastereoselective helical wrapping, and all complexes of this family were obtained as mixtures of stereoisomers. In contrast, bipyrrolidine was found to be a perfect chiral motif for helical wrapping, and the corresponding diamine−diolate complexes were obtained as (enantiomerically pure) single diastereomers.