Lewis Acid-Base Adducts of α-Amino Acid-Derived Silaheterocycles and -Methylimidazole.

In chloroform solution, the reaction of bis(tert-butylamino)dimethylsilane ((BuNH)SiMe) and an α-amino acid (α-amino isobutyric acid, ; D-phenylglycine, ; L-valine, ) in the presence of -methylimidazole (NMI) gave rise to the formation of the pentacoordinate silicon complexes , and , respectively. Therein, the amino acid building block was a di-anionic bidentate chelator at the silicon atom. In solution, the complexes were involved in rapid coordination-dissociation equilibria between the pentacoordinate Si complex (e.