Synthesis of a family of monomeric, base-free bis(cyclopentadienyl)titanium oxide complexes, (η5-C5Me4R) 2Ti=O (R = iPr, SiMe3, SiMe2Ph), has been accomplished by deoxygenation of styrene oxide by the corresponding sandwich compound. One example, (η5-C5Me 4SiMe2Ph)2Ti=O, was characterized by X-ray diffraction. All three complexes undergo clean and facile hydrogenation at 23°C, yielding the titanocene hydroxy hydride complexes (η5- C5Me4R)2Ti(OH)H. For (η5-C 5Me4SiMe3)2Ti=O, the kinetics of hydrogenation were first-order in dihydrogen and exhibited a normal, primary kinetic isotope effect of 2.7(3) at 23°C consistent with a 1,2-addition pathway. Isotope effects of the same direction but smaller magnitudes were determined for silane addition.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Inorganic Chemistry