Tris borate ligands, complexes magnesium

Strong evidence for this model is provided by an elegant substrate-catalyzed single-turnover experiment presented by Sadow and coworkers [81]. The four-coordinate Cs-symmetric magnesium tris(oxazoline)borate alkyl complex [To MgMe] (To = tris(4,4-dimethyl-2-oxazolinyl)phenylborate) excludes additional ligands from the coordination sphere and is a competent precatalyst for the hydroamination of l-aminopent-4-enes. In line with the expectations furnished by the aforementioned systems, the reaction of l-amino-2,2-diphenylpent-4-ene follows the empirical rate law v = / obs[aminoalkene] [catalyst], with a KIE of... 

The successful utilization of alkoxo Zn- and Mg-tris(pyrazolyl) borate initiators in the lactide polymerization inspired the synthesis of sterically bulky B-diketiminates (BDls) (Fig. 5) and their zinc and magnesium derivatives [60-62]. Replacing the ancillary ligands resulted in the production of several mono- and dinuclear complexes of Mg" and Zn" 24-39 (Fig. 6), which demonstrated excellent catalytic activity for the polymerization of l- and rac-lactide [62-66]. 

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