The chiral SnIV complexes L*SnMe2Cl (5) and L*SnMe2H (6) containing the P-chirogenic o-[(t-butyl)(phenyl)phosphinomethyl]phenolate ligand (L*) have been synthesized via the respective lithium complex [LiL*]4 (4). The synthesis and structure of 4 are described. The stereochemical course of the ligand synthesis was monitored by chiral HPLC and single crystal structure analysis on suitable intermediates. The tin atom in 5 is pentacoordinate by intramolecular phosphine coordination whereas 6 contains tetracoordinate tin without phosphine coordination. Slow racemization of 5 at 100 °C afforded 5-rac while oxidation with elemental oxygen led under retention of configuration at phosphorus to the phosphinoxide complex o-[(tBu)(Ph)P*(O)CH2]C6H4OSnMe2Cl (7) with P-O coordination to tin. The compounds 5, 5-rac, and 7 were also characterized by X-ray diffraction.

Model structures illustrating the presence of false least-squares R1-minima and their resolution with R2-refinement

Citations

Non-racemic Tin(IV) Complexes Containing P-chirogenic Phosphinomethylphenolate Ligands†

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