Salan ligands assembled around chiral bipyrrolidine: predetermination of chirality around octahedral Ti and Zr centres.
نویسندگان
چکیده
The first synthesis of Salan ligands assembled around the chiral 2,2'-bipyrrolidine backbone is described; as chelation to a metal can only occur via specific faces of the two pyrrolidine nitrogens, these ligands lead to predetermined chirality at metal centres of octahedral titanium and zirconium complexes.
منابع مشابه
Zirconium complexes of bipyrrolidine derived salan ligands for the isoselective polymerisation of rac-lactide.
Herein we report the synthesis and characterisation of a series of Zr(IV) 2,2'-bipyrrolidine-salan derived complexes and their exploitation for the ring opening polymerisation of rac-lactide to afford highly isotactically enriched polymers.
متن کاملMetal influence on the iso- and hetero-selectivity of complexes of bipyrrolidine derived salan ligands for the polymerisation of rac-lactide.
In this paper we have prepared a series of Ti(iv), Hf(iv) and Al(iii) complexes based on bipyrrolidine salan pro-ligands. The Hf(iv) complexes have all been characterised in the solid-state, the chiral ligands coordinate to Hf(iv) in an α-cis manner whereas the meso ligand coordinates in a β-cis geometry. The Hf(iv) complexes are all active for the ROP of rac-lactide in the melt, with the fluxi...
متن کاملMetal influence on the iso- and hetero-selectivity of complexes of bipyrrolidine derived salan ligands for the polymerisation of rac-lactide† †Electronic supplementary information (ESI) available: Full experimental data and crystal data in the .cif format. CCDC 1401694–1401702. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c5sc01819f Click here for additional data file. Click here for additional data file. Click here for additional data file.
In this paper we have prepared a series of Ti(IV), Hf(IV) and Al(III) complexes based on bipyrrolidine salan proligands. The Hf(IV) complexes have all been characterised in the solid-state, the chiral ligands coordinate to Hf(IV) in an a-cismanner whereas themeso ligand coordinates in a b-cis geometry. The Hf(IV) complexes are all active for the ROP of rac-lactide in the melt, with the fluxiona...
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متن کاملGroup 4 metal complexes with new chiral pincer NHC-ligands: synthesis, structure and catalytic activity.
Chiral group 4 NHC-metal complexes were prepared in good yields by amine elimination from M(NR2)4 (M = Ti, Zr, Hf; R = Me, Et) and chiral pincer NHC-ligands, L4(L4a and L4b), L5 and L6, which are derived from (S,S)-diphenyl-1,2-ethanediamine. Treatment of M(NR2)4 with 1 equiv. of L4 in THF gives, after recrystallization from a benzene solution, the chiral titanium amides (L4)Ti(NMe2)(Br)(THF) (...
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ورودعنوان ژورنال:
- Chemical communications
دوره 21 شماره
صفحات -
تاریخ انتشار 2009