Zur Bildung einer Zinn‐Zinn‐Bindung in Bis(hexamethyldisilazyl)‐Zinn(II) unter C‐H Bindungsbruch

AbstractFormation of a Tin‐Tin‐Bond from Bis(hexamethyldisilazyl)‐Tin(II) under Fission of a C‐H BondBis(hexamethyldisilazyl)tin(II) in excess reacts with the molecular alumosiloxane (Ph2SiO)8(AlO(OH))4 to yield the well known tin(II) derivative (Ph2SiO)8(AlO2)4Sn2 and the novel bicyclic [(Me3Si)2N]Sn[N(SiMe3)SiMe2CH2]2Sn[N(SiMe3)2] containing a tin‐tin bond, which is formally related to the starting molecule by a missing hydrogen atom. From X‐ray diffraction studies on single crystals it follows that the new compound has almost C2 point symmetry (the twofold axis intersecting the tin‐tin bond) and that this tin‐tin bond is the fusion edge of anellated fivefold Sn‐Sn‐N‐Si‐C rings. The bond connecting the almost tetrahedrally coordinated tin atoms (2.737(2) Å) is astonishingly very short. This feature is also reflected in the spectroscopic data (1H, 13C, 29Si, 119Sn‐NMR) of the compound with a coupling constant 1J (117Sn/119Sn) of 9529 Hz.