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Group 4 Complexes of a New [OSSO]-type Dianionic Ligand. Coordination Chemistry and Preliminary Polymerization Catalysis Studies

Group 4 Complexes of a New [OSSO]-type Dianionic Ligand. Coordination Chemistry and Preliminary Polymerization Catalysis Studies

Ad Cohen, Adi Yeori, Israel Goldberg, Moshe Kol

Inorg Chem. 2007 Oct 1;46(20):8114-6.

PMID: 17824700

Abstract:

A straightforward synthesis of a new type of tetradentate dianionic [OSSO]-type ligand is described. This ligand features an ethylenedithiol core bridged via methylene groups to substituted phenols, thus representing an S analogue of the [ONNO]-type Salan ligands. The [OSSO]H2 ligand precursor reacted with titanium(IV) isopropoxide and with zirconium(IV) tert-butoxide to give the corresponding [OSSO]-M(OR)2 complexes, which formed as single C2-symmetric isomers but were fluxional according to variable-temperature NMR. An X-ray structure of [OSSO]-Zr(O-t-Bu)2 supported the fac-fac wrapping mode of the ligand. The dibenzyl complex [OSSO]-Zr(bn)2 that was obtained by a reaction between the ligand precursor and tetrabenzylzirconium was found to be an active 1-hexene polymerization catalyst upon activation with B(C6F5)3, leading to a stereoirregular polymer despite its C2 symmetry.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP2081121	Zirconium(IV) tert-butoxide		2081-12-1	Price
AP3087396	Titanium(IV) tert-butoxide		3087-39-6	Price

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