Abstract
AbstractSeveral N‐functionalized bis(phosphanyl)amine ligands respectively containing benzyl, furfuryl, thiophene‐2‐methyl, thiophene‐2‐ethyl, and 2‐picolyl groups (1a–e) were synthesized and characterized. The ligands reacted with (DME)NiBr2 in CH2Cl2 to give their corresponding nickel complexes [Ph2PN(R)PPh2NiBr2] [R = CH2C6H5 (2a), CH2C4H3O (2b), CH2C4H3S (2c), CH2C5H4N (2d), and CH2CH2C4H3S (2e)]. The structures of these complexes were established by single‐crystal X‐ray crystallography. All these nickel complexes were highly active towards ethylene oligomerization in the presence of methylaluminoxane or Et2AlCl, producing a high content of butene (C4). Especially for 2e, which contains a thiophene‐2‐ethyl pendant group, the oligomerization products obtained at –40 °C contained 95.9 mol‐% C4 fraction with 100 mol‐% 1‐butene. Over 50 °C, however, these nickel complexes underwent Friedel–Crafts alkylation of toluene with ethylene and the olefin oligomers.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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