Binding selectivity of dihapto-coordinated olefins, ketones, and aldehydesutilizing the asymmetric pi-basic metal fragment {TpRe(CO)(1-methylimidazole)} (Tp = hydridotris(pyrazolyl)borate)

The metal fragment {TpRe(CO)(1-methylimidazole)} (Tp = hydridotris(pyrazoly l)borate) forms stable complexes with a variety of arenes and aromatic hete rocycles via dihapto coordination. In this study, a series of olefins, keto nes, and aldehydes are bound to ascertain the relative steric environment n ear the stereogenic metal center. Utilizing this information, predictions o f the diastereomeric selectivity of eta (2)-aromatic systems can be made.