N‐Substituierte 4,5‐Diethyl‐2,5‐dihydro‐2,2,3‐trimethyl‐1,2,5‐azasilaborole‐Herstellung und Charakterisierung

Abstract

In den vergangenen Jahren konnten wir neue ungesattigte, funf-und sechsgliedrige Heterocyclen 2-4) herstellen, die aus einer C =C-Gruppierung, einem Bor-Atom und einer variablen Heteroatomgruppierung, z. B. bei Funfringen der SiN-2'-C', SiO-''-c)

Synthesis, Structure, and Reactivity of Low-Coordinate 1,1,3,3-Tetraethylguanidinate Complexes

“…Low-coordinate d-block amides are relatively rare. ,− To place the family of TEG complexes into context, Table lists the interatomic M−N distances, N−M−N angles, and M···M distances for previously reported low-coordinate dinuclear Mn, Fe, Co, and Zn amides and imides. Complexes 2 − 5 are perhaps best compared to the corresponding bis(trimethylsilyl)amides, [M{μ-N(SiMe 3 ) 2 }{N(SiMe 3 ) 2 }] 2 . ,, The replacement of two disilylamides by two TEG ligands results in a slight decrease in the average M−N distance and a corresponding decrease in the M···M separation.…”

Isotope-induced chemical shifts1?12/13C(29Si) and57Fe NMR of organosubstituted 2,5-dihydro-1,2,5-azasilaboroles, a silole and their tricarbonyliron complexes

“…Thus, even 1  14/15 N( 29 Si) of compounds of type 1 and 3 have been determined at natural abundance of 15 N. 10 By using polarization transfer techniques, 20 the recording of 29 Si NMR spectra, e.g. of methylsilicon compounds taking advantage of 2 J( 29 Si, 1 H) ³7 Hz, is straightforward and 13 C satellites can be detected without spending too much time, in particular if there is no inherent broadening of the 29 Si resonance signals [see does arise as the result of partially relaxed scalar coupling between 29 Si and the quadrupolar nuclei 14 N (across one bond) and 11 B (across two or three bonds).…”