Stable Silanetriols as Building Blocks for the Synthesis of Titanasilasesquioxanes - Model Compounds for Titanium-Doped Zeolites

The first Ti4Si4 heterocubane with twelve edges bridged by O atoms was prepared in good yields and characterized by X-ray crystallography. According to the IR spectrum of 1, the characteristic band for Ti-containing zeolites at approximately 960cm-1, the assignment of which had been debated, arises from the SiOTi stretching vibration. R1 = tBu, tBu3C6H2O, iPr2C6H3N(SiMe3); R2 - MeC5H4, OiPr.