The first stable alkylidenetelluragermirane 4 was synthesized by the r
eaction of an overcrowded diarylgermylene Tbt(Mes)Ge: 2b (Tbt = 2,4,6-
tris[bis(trimethylsilyl)methyl]phenyl; Mes = mesityl) with 9-(dichloro
methylene)fluorene, 3, followed by addition of tributylphosphine tellu
ride. X-ray crystallographic analysis of 4 shows that the geometry of
its telluragermirane ring can be explained in, terms of a pi-complex:
binding model of a tellurium atom to a germanium-carbon double bond.