252268-98-7Relevant academic research and scientific papers
Synthesis characterisation of neutral cationic alkyl aluminium complexes bearing N,O-Schiff base chelates with pendant donor arms
Cameron, Paul A.,Gibson, Vernon C.,Redshaw, Carl,Segal, John A.,White, Andrew J.P.,Williams, David J.
, p. 415 - 422 (2007/10/03)
The Schiff base ligands [3,5-Bu2t-2-(OH)C6H2CH=NL] [L = CH2CH2NMe2 (1a), 2-(PhO)C6H4 (1b), 2-CH2C5H3N (1c), 8-C9H6N (quinoline) (1d) and 2-(PPh2)C6H4 (1e)] are accessed in good yields (>85%) via standard imine condensation reactions. Reaction of 1a-e with Me3Al at room temperature affords the corresponding complexes [(3,5-Bu2t-2-(O)C6H2CH=NL)AlMe 2] (2a-e); in the case of L = 8-quinoline, the same reaction conducted in refluxing toluene affords binuclear {[3,5-Bu2t-2-(O)C6H2CHMeN-8-C 9H6N]AlMe}2 (3) by methyl migration from metal to ligand. Further reaction of the dimethyl compounds with B(C6F5)3 in CD2Cl2 or C6D6 affords the cationic systems [(3,5-Bu2t-2-(O)C6H2CH=NL)AlMe] + (4a-e). The crystal structures of 2a, 2c, 2e and 3 have been determined. In 2a and 2c the respective ligands bind to the metal centre via all three heteroatoms, the aluminium having a trigonal bipyramidal geometry, whereas in 2e coordination is via nitrogen and oxygen only, and the aluminium is tetrahedral. Complex 3 has a dimeric structure with the ligand adopting both tridentate and binucleating roles; the aluminium centres are trigonal bipyramidal.
Pendant arm Schiff base complexes of aluminium as ethylene polymerisation catalysts
Cameron, Paul A.,Gibson, Vernon C.,Redshaw, Carl,Segal, John A.,Bruce, Michael D.,White, Andrew J. P.,Williams, David J.
, p. 1883 - 1884 (2007/10/03)
The potentially tridentate Schiff base ligands [3,5-Bu(t)2-2-(HO)C6H2CH=NL] 1, on reaction with Me3Al at room temperature, afford the complexes [(3,5-Bu(t)2-2-(O)C6H2CH=NL)AlMe2] [L = CH2CH2NMe2 2a, (2-PhO)C6H4 2b, 2-CH2C5H4N 2c and 8-C9H6N (quinoline) 2d], 2a and 2c have been characterised crystallographically; further reaction of the dimethyl compounds with B(C6F5)3 affords the cationic systems [(3,5-Bu(t)2-2-(O)C6H2CH=NL)-AlMe]+ 3a-d of which 3a and 3b are ethylene polymerisation catalysts.
