Zirconium complexes that contain a diamido O-donor ligand with a restricted geometry
- Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Chemistry
Addition of LiNH(2,6-Me{sub 2}C{sub 6}H{sub 3}) (LiNHAr{prime}) to cis-2,5-bis((tosyloxy)methyl)tetrahydrofuran gave cis-2,5-(ArNHCH{sub 2}){sub 2}(C{sub 4}H{sub 6}O) (H{sub 2}[1]). The reaction between Zr(NMe{sub 2}){sub 4} and H{sub 2}[1] yielded [1]Zr(NMe{sub 2}){sub 2}, from which [1]ZrCl{sub 2} and [1]ZrMe{sub 2} were prepared readily. An unsymmetric relative of H{sub 2}[1], cis-2,5-(Ar{prime}NHCH{sub 2})(ArNHCH{sub 2})(C{sub 4}H{sub 6}O) (H{sub 2}[2]; Ar = 2,6-i-Pr{sub 2}C{sub 6}H{sub 3}), was also prepared via the imine of 5-(hydroxymethyl)furaldehyde. Cations of the type {l_brace}[1]ZrMe(PhNMe{sub 2}){r_brace}[B(C{sub 6}F{sub 5}){sub 4}] and {l_brace}[2]ZrMe(PhNMe{sub 2}){r_brace}[B(C{sub 6}F{sub 5}){sub 4}], prepared in the reaction between the dimethyl species and [PhNHMe{sub 2}][B(C{sub 6}F{sub 5}){sub 4}], could be observed and were stable toward exchange of free and coordinated dimethylaniline on the NMR time scale, while cations prepared in the reaction between the dimethyl species and [Ph{sub 3}C][B(C{sub 6}F{sub 5}){sub 4}] did not have interpretable NMR spectra and appeared to be relatively unstable. Nevertheless, poly(1-hexene) that had a molecular weight approximately equal to the amount employed (up to 500 equiv) could be prepared by employing the latter at 0 C in chlorobenzene.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-86ER13564
- OSTI ID:
- 682124
- Journal Information:
- Organometallics, Vol. 18, Issue 16; Other Information: PBD: 2 Aug 1999
- Country of Publication:
- United States
- Language:
- English
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