1,3,2,4-DISELENASTANNABORETANE, A NOVEL SELENIUM-CONTAINING 4-MEMBERED BORACYCLE - SYNTHESIS, STRUCTURE AND THERMAL CYCLOREVERSION INTO A SELENOXOBORANE

Treatment of an overcrowded aryl trihydroborate bearing 2,4,6-tris[bis (trimethylsilyl)methyl]phe (Tbt) group with Cp2TiSe5 followed by the a ddition of Ar2SnCl2 (Ar = Ph or Mes) and Ph3P resulted in the isolatio n of novel selenium-containing four-membered boracycles, 1,3,2,4-disel enastannaboretanes, the thermolysis of which in the presence of 2,3-di methyl-1,3-butadiene or 2,4,6-tri-tert-butylbenzonitrile oxide indicat ed the formation of a novel class of boron-containing doubly bonded co mpound, an arylselenoxoborane(Tbt)B=Se.