[Me3Si (py;)]?X? (X = Br, I): R�ntgen-Strukturanalyse der 1:1-Addukte von Brom- und Iodtrimethylsilan mit Pyridin

Unusual Reactivity of a Disilyne with 4-Dimethylaminopyridine: Formation of an Intramolecularly N-Coordinated Silylene and Its Isomerization to a Zwitterionic Silyl Anion

“…The Si1–Si2 bond length [2.4061(11) Å] is reasonable for a Si–Si single bond. The N1–Si1 length [1.841(2) Å] is significantly shorter than the Si–N distance in the DMAP-coordinated silylene [2.005(2) Å] but similar to that of Me 3 Si(pyridine) + I – [1.858(9) Å] . The C35–Si2 bond length in 3 [1.922(3) Å] is slightly longer than typical Si–C(aryl) single bond lengths (av 1.879 Å) but close to that in [Ph(Me 3 Si) 2 SiLi] 2 [1.939(6) Å] .…”

Die Kristallstruktur der Verbindung N-Trimethylsilyl-3,4-Dimethylpyridiniumbromid/The Crystal Structure of N -Trimethylsilyl-3,4-dim ethylpyridinium Bromide

“…So w urden so wohl neutrale A dditionsverbindungen m it d er K o ordinationszahl sechs (SiF4-2Py) [5] als auch ioni sche A dditionsverbindungen wie (M e3SiPy)+Br~ [6] m it der K oordin atio n szah l vier am Z e n tra l atom Silicium gefunden. Zengerly [7] k o n n te die K oordinationszahl fü n f am S ilicium atom in der V erbindung [(N M I)2Si(M e)2H ]+C r nachw eisen, die von Bassindale und S to u t [8] 29Si-kernresonanzspektroskopischen U ntersuchungen p o stuliert w orden w ar.…”