| Abstract: | 29Si Chemical Shifts of Alkoxy(amino)silanes The 29Si NMR spectra of a series of alkoxy(amino)silanes (RO)nMe3?nSiNHC6H4X (n = 1–3) have been measured and are discussed by means of relative paramagnetic screening constants σ*, calculated by a simplified quantum-chemical model. The Hammett plots of the silicon chemical shift show both positive and negative slopes with changes of the number of electronegative atoms (O, N) attached to silicon. The steric and electronic shift contributions of the alkoxy groups are given. |
