Styrene-divinylbenzene resins were used for the synthesis of different polymer-bound beta-diketones, obtained by anchoring the chelating group through either the central or the lateral position. The heterogenized diketone ligand was subsequently reacted with Ni(COD)(2) analogously to hb the corresponding homogeneous catalysts active in alpha-olefin oligomerization. The heterogenized catalysts showed a good activity only when the central position of the chelate moiety was free. Heterogenization caused a significant change of selectivity: olefin oligomerization was accompanied by the formation of a large amount of in terms of steric effects caused by the bulky polymeric ligand. (C) 1998 John Wiley & Sons, Ltd.
Novel polymer-supported beta-diketonate nickel catalysts for alpha-olefin activation
CARLINI, CARLO;RASPOLLI GALLETTI, ANNA MARIA;SBRANA, GLAUCO;
1998-01-01
Abstract
Styrene-divinylbenzene resins were used for the synthesis of different polymer-bound beta-diketones, obtained by anchoring the chelating group through either the central or the lateral position. The heterogenized diketone ligand was subsequently reacted with Ni(COD)(2) analogously to hb the corresponding homogeneous catalysts active in alpha-olefin oligomerization. The heterogenized catalysts showed a good activity only when the central position of the chelate moiety was free. Heterogenization caused a significant change of selectivity: olefin oligomerization was accompanied by the formation of a large amount of in terms of steric effects caused by the bulky polymeric ligand. (C) 1998 John Wiley & Sons, Ltd.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
