Synthesis and Structure of Aminopyridinato‐Stabilized Yttrium and Lanthanum Amides and Their Reactivity towards Alkylaluminium Compounds

Abstract

A series of aminopyridinato-stabilized (amido)lanthanide complexes has been synthesized and characterized. The bulky aminopyridines (2,6-diisopropylphenyl)[6-(2,4,6-triisopropylphenyl)pyridin-2-yl]amine (1a) and [6-(2,4,6-triisopropylphenyl)pyridin-2-yl](2,4,6-trimethylphenyl)amine (1b) were introduced by amine elimination reaction with [Ln{N(SiHMe 2 ) 2 } 3 (thf) 2 ] (Ln = Y, La, thf = tetrahydrofuran, Me = methyl) to obtain the corresponding mono(aminopyridinato) complexes. Single-crystal X-ray analyses were carried out for the yttrium derivatives. The complexes are not able to undergo coordinative chain transfer polymerization with

Tailored Nanostructuring of End‐Group‐Functionalized High‐Density Polyethylene Synthesized by an Efficient Catalytic Version of Ziegler’s “Aufbaureaktion”

“…In addition, the size of the REM atom was varied to find a catalyst system that tolerates high CTA/catalyst ratio 9f,g. 22 Unfortunately, these variations did not lead to CTA/catalyst ratio above 500. Thus, our attention was shifted to Group 4 metals, especially, towards titanium catalysts.…”

Rare Earth Metal Complexes Supported by Ancillary Imidazolin‐2‐iminato Ligands

“…In addition, studies of the intramolecular hydroamination/cyclization reactions using catalytic amounts of the bis(neosilyl) complexes 4b and 4c and the "constrained-geometry" complexes 20a-20c (Scheme 20, reaction a), were also performed [43,94]. The main focus of the investigation was to evaluate their catalytic activity and to compare them with lanthanocene catalysts [13,105,107] and other non-Cp rare earth metal complexes [108][109][110][111]. The anaerobic hydroamination/cyclization of aminoalkenes and aminoalkynes catalyzed by complexes 4b and 4c (5 mol-%) proceeds to completion and is conveniently monitored by 1 H NMR spectroscopy [43].…”

An Efficient Titanium Amidinate Catalyzed Version of Ziegler's “Aufbaureaktion”

“…As a consequence, further studies were conducted at 50 °C. To rule out ligand transfer from Ti to trimethylaluminium (TMA),18,26 further experiments were also done with d‐MAO, MAO from which free TMA was removed. Alteration of the ligand backbone did not give greatly different polymerization results at this stage.…”