| |
Alternating Copolymerization of Cyclohexene Oxide and Carbon Dioxide Catalyzed by Noncyclopentadienyl Rare-Earth Metal Bis(alkyl) Complexes
The
syntheses of several dialkyl complexes based on rare-earth metal were
described. Three beta-diimine compounds with varying N-aryl substituents (HL1 =
(2-CH3O(C6H4))N=C(CH3)CH=C(CH3)NH(2-CH3O(C6H4)), HL2 = (2,4,6-(CH3)(3)
(C6H2))N=C(CH3)CH=C(CH3)NH(2,4,6-(CH3)(3)(C6H2)), HL3 = PhN=C(CH3)CH(CH3) NHPh)
were treated with Ln(CH2SiMe3)(3)(THF)(2) to give dialkyl complexes L(1)Ln
(CH2SiMe...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_12016.html |
| |
Rare-earth metal alkyl complexes bearing an alkoxy N-heterocyclic carbene ligand: synthesis, characterization, catalysis for isoprene polymerization
Treatment
of imidazolium iodide [R-NHC-CH2CH(nBu)OH]I (1a (R
= methyl), 1b (R = isopropyl)) and benzimidazole iodide
[R-NHC(C6H4)-CH2CH(nBu)OH]I
(2a (R = methyl),2b (R = isopropyl)), respectively,
with ((trimethylsilyl)methyl)lithium (LiCH2SiMe3)
followed by rare-earth metal tris(alkyl)s (Ln(CH2SiMe3)3(THF)2)
(Ln = Sc, Y, Lu) afforded the alkoxy-modified N-heterocyclic c...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_12014.html |
| |
Highly trans-1,4 selective (co-)polymerization ofbutadiene and isoprene with quinolyl anilido rare earth metal bis(alkyl) precursors
The N-R-quinolinyl-8-amino ligands HL1–3 (R
= 2,6-iPr2C6H3 (HL1),
2,6-Et2C6H3 (HL2), 2,6-Me2C6H3 (HL3))
have been prepared, which reacted readily with one equiv. of rare earth
metal tris(alkyl)s to afford the corresponding bis(alkyl) complexes L1Y(CH2SiMe3)2(THF)
(1) and L1–3Lu(CH2SiMe3)2(THF)
(2–4) viaalkane elimination. Contrastingly, treatm...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_12013.html |
| |
Copolymerization of ethylene with norbornenecatalyzed by cationic rare earth metal fluorenylfunctionalized N-heterocyclic carbene complexes
Rare
earth metal bis(alkyl) complexes attached
by fluorenyl modified N-heterocyclic carbene (NHC)
(Flu-NHC)Ln(CH2SiMe3)2 (Flu-NHC = (C13H8CH2CH2(NCHCCHN)C6H2Me3-2,4,6);
Ln = Sc (2a); Y (2b); Ho (2c); Lu (2d)),
(tBuFlu-NHC)Ln(CH2SiMe3)2 (tBuFlu-NHC
= 2,7-tBu2C13H6CH2CH2(NCHCCHN)C6H2Me3-2,4,6;
Ln = Sc (1a);&n...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_12011.html |
| |
Synthesis and Characterization of Heteroscorpionate Rare-Earth Metal Dialkyl Complexes and Catalysis on MMA Polymerization
A
series of rare-earth metal alkyl complexes supported by a heteroscorpionate
ligand were prepared and structurally characterized. X-ray diffraction analysis
revealed that the heteroscorpionate ligand is face-capping on the rare-earth
metal in k(3) mode, making the configuration of the afforded chalky! metal
complexes similar to that of half-metallocenes. These complexes are capable of
polymeriz...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11995.html |
| |
Isoprene polymerization with indolide-imine supported rare-earth metal alkyl and amidinate complexes
Reaction of 7-{(N-2,6-R)iminomethyl)}indole (HL1, R = dimethylphenyl; HL2, R = diisopropylphenyl) and rare-earth metal tris(alkyl)s, Ln(CH2SiMe3)3(THF)2, generated new rare-earth metal bis(alkyl) complexes LLn(CH2SiMe3)2(THF) [L = L1: Ln = Lu (1a), Sc (1b); L = L2: Ln = Lu (3a), Sc (3b)] and mono(alkyl) complexes L22Lu(CH2SiMe3) (4a). Treatment of alkyl complexes 1a and 4a&nb...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11992.html |
| |
Highly 3,4-selective living polymerization of 2-phenyl-1,3-butadiene with amidino N-heterocyclic carbene ligated rare-earth metal bis(alkyl) complexes
A series of amidino N-heterocyclic carbene ligand supported rare-earth metal bis(alkyl) complexes (2,6-R12C6H3NCR2NCH2CH2(NCHCHN(C6H2Me3-2,4,6)C))Ln(CH2SiMe3)2[R1 = iPr, R2 = Ph, Ln = Lu (1a); R1 = iPr, R2 = Ph, Ln = Sc (1b); R1 = iPr, R2 = tBu, Ln = Lu (2a); R1 = Me, R2 = Ph, Ln = Lu (3a)] were synthesized and characterized by NMR...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11987.html |
| |
Rare-earth metal bis(alkyl)s that bear a 2-pyridinemethanamine ligand: Dual catalysis of the polymerizations of both isoprene and ethylene
New pyridinemethanamido-ligated rare-earth metal bis(alkyl) complexes [C5H4N-CH(Me)-NC6H3(iPr)2]Ln(CH2SiMe3)2(THF) (Ln = Sc (1), Y (2), Lu (3)) have been prepared at 0 °C via a protonolysis reaction between rare-earth metal tris(alkyl)s and the corresponding 2-pyridinemethanamine ligand and fully characterized by NMR and X-ray diffraction analysi...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11985.html |
| |
Tridentate CCC-Pincer Bis(carbene)-Ligated Rare-Earth Metal Dibromides. Synthesis and Characterization
The
first xylene-bridged bis(N-heterocyclic carbene) (bis(NHC))-ligated CCC-pincer
rare-earth metal dibromides (PBNHC)LnBr2(THF) (PBNHC = 2,6-(2,4,6-Me3C6H2NCHCHNCCH2)2C6H3; 1:
Ln = Sc; 2: Ln = Lu; 3: Ln = Sm) were
prepared by in situ treatment of a THF suspension of
2,6-bis(1-mesitylimidazolium methyl)-1-bromobenzene dibromides
((PBNHC-Br)·2HBr) and lanthanide tr...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11983.html |
| |
The behavior of pyrrolyl ligands within the rare-earth metal alkyl complexes. Insertion of C=N and C=O double bonds into Ln-sigma-C bonds
This paper presents some unusual reactions of lanthanide tris(alkyl)s or lanthanide mono-Cp′ (Cp′ = (C5Me4)SiMe3) bis(alkyl)s with pyrrolyl ligands, and the η5- or η1-coordination mode of the pyrrolyl ring, as well as CN and CO double bonds insertion into Ln–σ-C moities. N,N,O-tridentate ligand HL1, 2-(2-CH3OC6H3NCH)–C4H3NH, was prepared. ...
http://www.polymer.cnt//ss/dongmeicui/publicationsshow_11980.html |
| |
|