The novel [Ni{(Ph2P)2N(CH2)3Si(OCH3)3-P,P´}I2] complex: Structural features and catalytic reactivity in the oligomerization of ethylene

Abstract

Abstract:The novel [Ni{(Ph 2 P) 2 N(CH 2 ) 3 Si(OCH 3 ) 3 -P,P´}I 2 ] complex (1) was synthesized and investigated by a variety of spectroscopic methods (IR, 1 H and 31 P NMR). The molecular structure of 1, determined by single crystal X-ray diffraction, was compared with those of the analogue [Ni{(Ph 2 P) 2 N(CH 2 ) 3 Si(OCH 3 ) 3 -P,P´}Cl 2 ] complex (2) and the recently reported [Ni{( i PrP) 2 NH-P,P´}I 2 ] complex. Complexes 1 and 2 were tested as homogeneous catalysts for the oligomerization of ethylene, leading to the formation of C 4 and, to a smaller extent, C 6 products, in moderate yields.

Effects of the halogenido ligands on the Kumada-coupling catalytic activity of [Ni{tBuN(PPh2)2-κ2P}X2], X = Cl, Br, I, complexes

“… 2 Selected palladium( ii ) complexes bearing X = Cl, 9–14 Br, 14,15 I, 14,16 catalyze the Suzuki–Miyaura and Heck coupling reactions. Some structurally characterized Ni( ii ) analogous complexes bearing X = Cl, 17–28 Br, 18,29–37 I, 18,36,38 catalyze polymerization of norbornene 20,21 or oligomerization (X = Br, 32,34 I, 38 ) and polymerization (X = Br 29 ) of ethene. It should be stressed that nickel( ii ) complexes of this family are only moderately active catalysts in the Suzuki–Miyaura reaction.…”