Synthesis and structure of tetrakis[bis(trimethylsilylmethyl)tin]

Addition of Ethylene or Hydrogen to a Main‐Group Metal Cluster under Mild Conditions

“…The known species have formulas Sn 4 L 8 (L = alkyl ligand) or Sn 4 L' 4 (L' = bidentate ligand). [31][32][33] The 1 H NMR spectrum of 2 shows a hydride signal at 3.97 ppm, and the 119 Sn NMR spectrum displays a doublet at À324.3 ppm, J Sn-H = 1590 Hz. [34] The reactivity of the tin cluster towards H 2 and ethylene was investigated computationally using the PBE0 hybrid functional [35][36][37][38] with def2-TZVP basis sets.…”

Functionalized tetrastannacyclobutanes, Part I

“…Ring systems with silicon containing substituents like octakis-((trimethylsilyl)-methyl)-tetrastannacyclobutane [5] were also reported ( Fig. 1).…”

Tin

“…28 ' 29 The magnitude o f 1 7( 119 Sn-13 C) (ca. 365 Hz) has been used to show that neopentyltin hydroxide and oxide are not associated in solution, and the two compounds have been distinguished by the absence o f 117 Sn- 119 Sn coupling in the former compound and its presence in the latter. 25 Solvent-induced changes in 5 Sn and in 1 7( 119 Sn-13 C) show that tributyl-and triphenyltin perchlorates dissociate in solution to give trigonal bipyramidal solvated species R 3 Sn(ClO 4 )L and R 3 SnL 2 + C 1 O 4~, and in hexamethylphosphoramide (HMPA) as solvent, the 1 1 9 S n signal showed coupling to two equivalent apical 31 P nuclei.…”

“…^ At or above room temperature it is in equilibrium with the stannylene and distannene (69), and these species can be trapped with propylene sulfide, or with selenium or tellurium, to give the corresponding thia-, selena-, or telluradistannitanes Tin (70). 395 ' 396 The presence of the tin-tin bond in these compounds is established by the observation of 117 Sn- 119 Sn coupling in the NMR spectra. By photolysis of the cyclotristannane at -78 °C, the distannene Ar 2 Sn=SnAr 2 (69), Ar = Pr 1 3 C 6 H 2 ) is formed quantitatively, and can be isolated as an intensely red solid which is very sensitive to air and moisture.…”