Synthesis and characterization of Ti(C 5H 5)(2,4-C 7H 11) and Ti(2,4-C 7H 11) 2[ , chiral phosphite adducts of an open and a half open titanocene

Abstract

The chiral phosphite derived from S-1,2,4-butanetriol has been found to bind both half-open and open titanocene moieties (Ti(C 5H 5)(2,4-C 7H 11) and Ti(2,4-C 7H 11) 2, C 7H 11=dimethylpentadienyl) strongly. The expected reduction in symmetry upon coordination was evidenced through 1H and 13C NMR spectroscopies. Although the compounds were found to be thermally unstable, presumably as a result of the presence of a strained five-membered ring, an X-ray diffraction study of the latter complex could be achieved at low temperatures. Two nonequivalent conformations were observed in the solid state.