10.1021/om049897p.s007 Sarah B. Cortright Sarah B. Cortright John C. Huffman John C. Huffman Ryan A. Yoder Ryan A. Yoder Joseph N. Coalter Joseph N. Coalter Jeffrey N. Johnston Jeffrey N. Johnston IAN Amines:  Chiral <i>C</i><sub>2</sub>-Symmetric Zirconium(IV) Complexes from Readily Modified Axially Chiral <i>C</i><sub>1</sub>-Symmetric β-Diketimines American Chemical Society 2004 metallocene complexes configurational integrity derivative t Bu pyridyl ligands Symmetric ethylene polymerization enantioselective addition metal coordination transfer asymmetry Modified Axially Chiral C 1 homochiral ligands ci mino N aphthalene components i Pr NMe 2 topographical similarity C 2 steric hindrance IAN amines 2 Ph 2004-05-10 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/IAN_Amines_Chiral_i_C_i_sub_2_sub_Symmetric_Zirconium_IV_Complexes_from_Readily_Modified_Axially_Chiral_i_C_i_sub_1_sub_Symmetric_Diketimines/3340222 A general synthesis of β-diketimines derived from <i>I</i>soquinoline and <i>A</i>mino<i>N</i>aphthalene components (IAN amines) is reported. Beginning from inexpensive 2-naphthol and isoquinoline, the sequence of reactions leading to R-IAN amines is convergent, short, and high-yielding. Several new derivatives are reported (e.g., R = Bn, <i><sup>i</sup></i><sup></sup>Pr, <i><sup>t</sup></i><sup></sup>Bu, Ph, 2,6-Me<sub>2</sub>Ph, 2,6-<i><sup>i</sup></i><sup></sup>Pr<sub>2</sub>Ph, 2-Np). All of these were complexed to zirconium(IV) by transamination with Zr(NMe<sub>2</sub>)<sub>4</sub>, and in all cases 1:1 R-IAN:Zr complexes immediately formed at 25 °C. Except in cases of severe steric hindrance (<i><sup>i</sup></i><sup></sup>Pr-IAN and 2,6-Me<sub>2</sub>Ph), the corresponding 2:1 IAN:Zr complexes formed at temperatures ranging from 25 to 100 °C in toluene. A feature conserved among all 2:1 IAN:Zr complexes was a remarkable degree of diastereoselectivity favoring a <i>C</i><sub>2</sub>-symmetric bis(β-diketiminate) isomer bearing <i>cis</i>-NMe<sub>2</sub> and <i>cis</i>-pyridyl ligands. Although all complexations were performed from <i>rac</i>-IAN, the resulting complexes are composed solely of homochiral ligands. The configurational integrity of Me-IAN and its ability to transfer asymmetry upon metal coordination was demonstrated in the catalyzed enantioselective addition of diethylzinc to benzaldehyde. Given the topographical similarity between these and metallocene complexes, several derivatives were preliminarily evaluated in ethylene polymerization.