Abstract
Cryoscopic and n.m.r. studies show that the ethoxide, n-propoxide, and n-butoxide of titanium are trimeric in solution over wide ranges of concentrations and temperature. Intramolecular exchange of terminal and bridging alkoxide groups is too rapid even at –90° to be resolved by n.m.r. at 60 Mc.sec. N.m.r. studies revealed reversible depolymerization of the trimers at high temperatures and low concentrations. Titanium isobutoxide and neopentoxide showed a concentration and temperature dependence of n.m.r. chemical shift due to the presence of monomers, dimers, and trimers. Zirconium and hafnium isopropoxides contain mixtures of trimers and tetramers, but the cryoscopically determined molecular weights are independent of concentration.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
