2,5-Di-tert-butylphenylsilanetriol: synthesis and reactivity

Stable 2,5-di-tert-butylphenylsilanetriol was prepared by a stepwise synthesis. This compound reacted with triethylenediamine and lanthanum silylamide to form a 1∶1 molecular complex and highly thermally stable lanthanosilsesquioxane, respectively. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1583–1587, August, 1999.     

Synthesis,structure, and reactivity of siloxides and germyloxides of iron(ii) and cobalt(ii)

Iron and cobalt siloxides and germyloxides [(Me₃Si)₃SiO]₂M (M = Fe (1), Co (2)), (Me₅Si₂O)₂Fe (3), (Prⁱ ₃SiO)₂M (M = Fe (4), Co (5)), (Prⁱ ₃GeO)₂Fe (6), (Ph₃SiO)₂Fe (7), (Me₃SiO)₂Fe (8), (Prⁱ ₃GeO)₂Fe(bpy) (9), and [(Me₃Si)₂NFe(-OSi₂Me₅)₂]₂Fe·C₆H₆ (10) were synthesized by the reactions of metal silylamides [(Me₃Si)₂N]₂M (M = Fe, Co) with the corresponding silanols or triisopropylgermanol. The reaction of pentamethyldisilanol with iron(ii) silylamide affords either polymeric complex 3 or coordination oligomer 10, depending on the ratio of the reactants. The structures of complexes 9 and 10 were established by X-ray diffraction analysis. The interaction of the prepared compounds with carbon oxides was studied. Low-coordination cobalt siloxide is the only among all prepared compounds that absorbs CO (2 mol) at room temperature and under 1 atm to form an unstable cluster. Compounds 1, 2, and 4—8 react with CO₂ to form carbonate complexes, and their reactivity decreases with a decrease in the electron-donating ability of the substituents at the central atom: (Me₃Si)₃SiO > Prⁱ ₃GeO Prⁱ ₃SiO > Me₃SiO Ph₃SiO.