862891-16-5

Upstream product

• 6573-11-1 1,4,7-trithiacyclononane 
• 41705-65-1 [scandium tris(trimethylsilylmethyl)(THF)2] 
• 862891-13-2 Sc(CH2SiMe3)3(fac-κ3-1,4,7-trithiacyclononane) 
• 658705-06-7 Sc(CH₂SiMe₃)3(fac-tris(3,5-dimethylpyrazolyl)methane) 
• 658705-04-5 Sc(CH₂SiMe₃)3(fac-1,4,7-trimethyl-1,4,7-triazacyclononane) 
• 109-99-9 tetrahydrofuran 

Relevant academic research and scientific papers

The first rare earth organometallic complex of 1,4,7-trithiacyclononane: A precursor to unique cationic ethylene and α-olefin polymerisation catalysts supported by an all-sulfur donor ligand

[Sc([9]aneS3)(CH2SiMe3)3], the first rare earth organometallic complex of 1,4,7-trithiacyclonane, is a precursor to ethylene and α-olefin polymerisation catalysts upon activation with BArF3 or [CPh3][BArF 4] (ArF = C6F5); these are the first cationic rare earth organometallic catalysts supported by an all-sulfur donor ligand. The Royal Society of Chemistry 2005.

Synthesis, DFT studies, and reactions of scandium and yttrium dialkyl cations containing neutral fac-N3 and fac-S3 donor ligands

Reaction of Sc(CH2SiMe3)3(THF)2 with 1,4,7-trithiacyclononane gave Sc([9]aneS3)(CH 2SiMe3)3, the first organometallic group 3 complex of [9]aneS3 ([9]aneS3 = 1,4,7-trithiacyclononane). The corresponding reaction for yttrium gave equilibrium mixtures of Y([9]aneS3)(CH2SiMe3)3 and starting materials. Density functional theory (DFT) was used to compare the energies of formation and metal-ligand interaction energies for M([9]aneS3)R 3 with those for the previously reported fac-N3 donor complexes M(fac-N3)R3 (R = Me or CH2SiMe 3; fac-N3 = 1,4,7-trimethyltriazacyclononane (Me 3[9]aneN3) or HC(Me2pz)3). Reaction of M(CH2SiMe3)3(THF)2 with [NHMe2Ph] [BArF4] (ArF = C 6F5) in the presence of a face-capping ligand L (L = HC(Me2pz)3, Me3[9]aneN3, or [9]aneS3) gave the cationic complexes [M(L)(CH2SiMe 3)2(THF)]+, which has been structurally characterized for M = Sc and L = [9]aneS3. The corresponding base-free cations [M(L)(CH2SiMe3)2]+ were studied by 29Si NMR spectroscopy and/or DFT and found to possess β-Si-C agostic alkyl groups in most instances. The isolated cations [Sc(fac-N3)(CH2SiMe3)2(THF)] + underwent THF substitution reactions with OPPh3 or pyridine, Sc - alkyl migratory insertion with carbodiimides, and C-H bond metathesis with PhCCH. The olefin polymerization capabilities of a series of complexes M(L)R3 have been determined. The scandium complexes were found to be very productive for ethylene polymerization for L = HC(Me 2pz)3, Me3[9]aneN3, or [9]aneS 3 and R = CH2SiMe3 when activated with 1 equiv of [CPh3][BArF4]. When activated with 2 equiv of [CPh3][BArF4], the compounds were also very active for the polymerization of 1-hexene.