Abstract Reactions of GeBr 4 with N, N-dimethyl-2-trimethylsiloxypropionamide (2a),(S)-2- trime-thylsiloxypropionpyrrolidide ((S)-2b), and N, N-dimethyl-O-(trimethylsilyl) mandelamide (2c) afforded pentacoordinated neutral (O, O)-monochelates, viz., N, N-dimethyl-2- tribromoger-myloxypropionamide (3a),(S)-2-tribromogermyloxypropionpyrrolidide ((S)-3b), and N, N-dimethyl-O-(tribromogermyl) mandelamide (3c), respectively. X-ray diffraction ...