The Si NMR chemical shifts of a number of uranium complexes have previously been compiled, and though there is no Si NMR data of a U(III) hypersilanide complex for comparison we note that SiMe3 groups were assigned in the Si NMR spectra of [K(18-crown-6)][U{[Si(SiMe3)2SiMe2]2O}(THF)2(I)2] (-50.0 ppm), and trigonal pyramidal [U{N(SiMe3)2}3] (-219 ppm). The δSi values of the SiMe3 groups (-6.0 ppm) and metal-bound silicon atoms (-70.5 ppm) of U(THF)n (n = 0 or 1) are far downfield of most of the previously reported range of δSi values for U(III) complexes (between -116 and -247 ppm), which tend to exhibit chemical shifts >100 ppm upfield of parent group 1 ligand transfer agents. The comparatively small paramagnetic shift of the SiMe3 groups and the silanides in U(THF)n