10.1021/ic701370t.s003
Ad Cohen
Ad
Cohen
Adi Yeori
Adi
Yeori
Israel Goldberg
Israel
Goldberg
Moshe Kol
Moshe
Kol
Group 4 Complexes of a New [OSSO]-Type Dianionic Ligand.
Coordination Chemistry and Preliminary Polymerization Catalysis
Studies
American Chemical Society
2007
S analogue
tetradentate dianionic
group 4 Complexes
OSSO
C 2 symmetry
ethylenedithiol core bridged
methylene groups
ONNO
Coordination Chemistry
NMR
Preliminary Polymerization Catalysis Studies
C 2
ligand precursor
ligand features
stereoirregular polymer
2007-10-01 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Group_4_Complexes_of_a_New_OSSO_Type_Dianionic_Ligand_Coordination_Chemistry_and_Preliminary_Polymerization_Catalysis_Studies/2983282
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]H<sub>2</sub> ligand precursor reacted with titanium(IV) isopropoxide and with zirconium(IV) <i>tert</i>-butoxide to give the corresponding [OSSO]−M(OR)<sub>2</sub> complexes, which formed as single <i>C</i><sub>2</sub>-symmetric isomers but were fluxional according to variable-temperature NMR. An X-ray structure of [OSSO]−Zr(O-t<i>-</i>Bu)<sub>2</sub>
supported the <i>fac</i><i>−</i><i>fac</i> wrapping mode of the ligand. The dibenzyl
complex [OSSO]−Zr(bn)<sub>2</sub> 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(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>, leading to a stereoirregular polymer despite its <i>C</i><sub>2</sub>
symmetry.