Titanium and zirconium benzofuranoxides. Crystal structures and catalytic properties.
Reactions of Ti(OiPr)4 or Zr(OEt)4 with 4 equivalents of 2,3-dihydro-2,2-dimethyl-7-benzofuranol (ddbfoH) in toluene gave neutral complexes that in the solid state are dimers of [Ti(micro-ddbfo)2(ddbfo)6] and [Zr(ddbfo)3(EtOH)(micro-EtO)]2 composition. The former could also be conveniently synthesized in a direct reaction of TiCl4 with ddbfoH. This air-stable aryloxo compound was found to initiate living ring-opening polymerization of lactides affording polyesters with narrow molecular weight distribution. It also catalyzed addition of terminal acetylenes to aryl aldehydes.
Krauzy-Dziedzic
Katarzyna
K
Department of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383, Wrocław, Poland.
Ejfler
Jolanta
J
Szafert
Sławomir
S
Sobota
Piotr
P