Rare-earth dichloro and bis(alkyl) complexes supported by bulky amido–iminoligand. Synthesis, structure, reactivity and catalytic activity in isoprene polymerization†
Abstract
A monoanionic amido–C(Me)C(
CH2)N(C6H3-2,6-iPr2)]− was successfully employed for the synthesis of monomeric dichloro [(2,6-iPr2C6H3)N
C(Me)C(
CH2)N(C6H3-2,6-iPr2)]LnCl2(THF)2 (Ln = Y, 2Y; Lu, 2Lu) and bis(alkyl) [(2,6-iPr2C6H3)N
C(Me)C(
CH2)N(C6H3-2,6-iPr2)]Ln(CH2SiMe3)2(THF) (Ln = Y, 4Y; Lu, 4Lu) species of yttrium and lutetium. Dichloro complexes 2Y and 2Lu turned out to be unstable in aromatic
CH2)C(
CH2)N(C6H3-2,6-iPr2)]2−
C(Me)C(Me)
N(C6H3-2,6-iPr2) and YCl3. On the contrary, bis(alkyl) species 4Y and 4Lu are rather stable and do not undergo such a transformation or
C(Me)C(
CH2)N(C6H3-2,6-iPr2)]Y(CH2SiMe3)(μ-OMe)}2 (5). The ternary systems 4Ln/AliBu3/borate (borate = [HNMe2Ph][B(C6F5)4] and [CPh3][B(C6F5)4]; molar ratio 1 : 10 : 1) performed high catalytic activity in isoprene
- This article is part of the themed collection: Advances in metal-catalysed polymerisation and related transformations