2,2′-bipyrrolidine versus 1,2-diaminocyclohexane as chiral cores for helically wrapping diamine-diolate ligands

Ekaterina Sergeeva, Jacob Kopilov, Israel Goldberg, Moshe Kol

Research output: Contribution to journalArticlepeer-review

Abstract

The synthesis of chiral tetradentate dianionic diamine-diolate ligands assembled around either N,N′-dimethyl-frans-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.

Original languageEnglish
Pages (from-to)8075-8077
Number of pages3
JournalInorganic Chemistry
Volume48
Issue number17
DOIs
StatePublished - 7 Sep 2009

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