Synthesis and structures of ferrocenyl-substituted salicylaldiminato complexes of magnesium, titanium and zirconium
摘要:
N-ferrocenyl salicylaldimine (FcPI)H, readily accessible from aminoferrocene and salicylaldehyde, reacts with dibutylmagnesium in THF to afford a red crystalline (FcPI)(2)Mg(THF)(2) (2). The reactions of the Li(FcPI) with CpTiCl3 gave CpTiCl2(FcPi) center dot CH2Cl2 (4), whereas with CpZrCl3 center dot DME a mixture of three products is formed: CpZrCl(FcPI)(2) (5), CpZrCl2(FcPi) (6), and (FcPI)(2)ZrCl2 center dot CH2Cl2 (3 center dot CH2O2). The crystal structures of compounds 2-6 are reported. Typically, the N-O chelates are oriented such that 0 donors are mutually trans, while N donors prefer to be trans to Cl ligands. The redox potentials of these complexes are very similar to ferrocene. On activation with methylaluminoxane, the Ti complex 4 shows moderate activity for ethylene polymerisation, while (FCPI)(2)ZrCl2 is highly active for the oligomerisation of ethylene, to give products with average degrees of polymerisation of 12-16. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis and structures of ferrocenyl-substituted salicylaldiminato complexes of magnesium, titanium and zirconium
摘要:
N-ferrocenyl salicylaldimine (FcPI)H, readily accessible from aminoferrocene and salicylaldehyde, reacts with dibutylmagnesium in THF to afford a red crystalline (FcPI)(2)Mg(THF)(2) (2). The reactions of the Li(FcPI) with CpTiCl3 gave CpTiCl2(FcPi) center dot CH2Cl2 (4), whereas with CpZrCl3 center dot DME a mixture of three products is formed: CpZrCl(FcPI)(2) (5), CpZrCl2(FcPi) (6), and (FcPI)(2)ZrCl2 center dot CH2Cl2 (3 center dot CH2O2). The crystal structures of compounds 2-6 are reported. Typically, the N-O chelates are oriented such that 0 donors are mutually trans, while N donors prefer to be trans to Cl ligands. The redox potentials of these complexes are very similar to ferrocene. On activation with methylaluminoxane, the Ti complex 4 shows moderate activity for ethylene polymerisation, while (FCPI)(2)ZrCl2 is highly active for the oligomerisation of ethylene, to give products with average degrees of polymerisation of 12-16. (c) 2005 Elsevier Ltd. All rights reserved.