Silicon‐Carbon Compounds with a Carborundum Structure (“Carborundanes”)

Abstract

C12TeS.7 forms orthorhombic crystals, space group D: ; -Pmnb,a=8.82,b=9.01, c=13.28 A; Z = 4 ; d~-~~~= 2 . 6 5 g/cm3. Preliminary results from an X-ray structure analysis indicate the following structure:The eight-membered ring has the same "crown shape" as the s 8 ring of the cr-[ll and @-modification[2] of sulfur. The Te atom is coordinated as a distorted trigonal bipyramid: The C1 atoms occupy the apices of the pyramids, the lone pair taking up an equatorial position. Procedure:A solution of "crude sulfane"[31 (20 g) in CS2 (0.5 1) is added dropwise to a stirred solution of TeC14 (20 g) in CHzCI?: (1 1) and CS2 (0.5 1) at room temperature over a period of 4-5 h. About 18 g of C12TeS7 is precipitated; concentration of the filtrate to a volume of 200 ml yields another 2 g of product. Purification is by recrystallization from CSz.

Site‐Selective Functionalization of Sila‐Adamantane and Its Ensuing Optical Effects

“…[11] Despite its promise, the development of silicon diamondoids has remained in its infancy. While adamantanes with mixed tetrel-silicon cores such as Fritz's C 6 Si 4 carborundane [12] and Wagner's recent Ge x Si y adamantanes [13] have been reported, no experimental studies on sila-adamantane have followed since its 2005 report, leaving much to be discovered about the mechanism of its synthesis, derivatization, and physical properties.…”

Installing Quaternary Germanium Centers in Sila-Diamondoid Cores via Skeletal Isomerization

“…[31][32][33][34][35] The synthesis of all-tetrel heteroadamantanes has been less developed. 26,27,36 Wagner and coworkers recently devised one-pot approaches to the endocyclic substitution of internal 2˚ centers with four to six Ge (or Sn) atoms through the chloride-induced disproportionation of Si2Cl6 and Ge(Sn)Me2Cl2 (Figure 1). 26,27 Marschner, Müller, and coworkers disclosed a "germanium shuttling" approach, where linear and cyclic oligosilanes with terminal germane substituents internalize Ge atoms to the most heavily branched positions via sila-Wagner-Meerwein shifts (Figure 1).…”