Catalytic activity of phenyl substituted cyclopentadienyl neodymium complexes in the ethylene oligomerization process

An efficient route for design of luminescent composite materials based on polyethylene containing europium dibenzoylmethanate

“…The tetraalkylammonium salt, (RNEt 3 )I, was prepared by the reaction of RI with triethylamine. 28 Hereinafter, R designates a set of C n H 2n+1 oligomers with n = 18-44, where n is an even number (with the weight-average molecular weight corresponding to n = 30-32). The sample of RI 1-iodoalkanes used to prepare the ammonium salt was synthesized by catalytic oligomerization of ethylene followed by treating the reaction mixture with iodine 28 (Scheme 2).…”

“…Hexane was distilled from the Na/K alloy. Na[Eu(dbm) 4 ](C 2 H 5 OH) 2 (1), 24 was prepared according to literature procedures, synthesis of the oligomer mixture ''RI'' was performed according to the published procedure 28 with some modifications, as described in the ESI † (S1). The matrix polymer used to prepare the composite was PE, M w = 3 Â 10 5 , M n = 1 Â 10 5 , d = 0.940 g cm À3 , Mp.…”

The structural diversity of heterocycle-fused potassium cyclopentadienides

“…Potassium salts were obtained from corresponding heterocyclefused cyclopentadienes 1-4 by metallation with benzyl potassium in THF medium. This efficient method of metallation of substituted cyclopentadienes, which we recently proposed, [33][34][35] signicantly increased the availability of potassium derivatives that are synthetic precursors of cyclopentadienyl complexes. Crystalline salts 5-8 were obtained by slow ($1 week) diffusion of n-hexane into solutions of metallation products in THF (5) or in THF/diglyme mixture (for 6-8, see Scheme 4).…”

(1R,2S,4r)-1,2,4-Triphenylcyclopentane-1,2-diol and (1R,2S,4r)-4-(2-methoxyphenyl)-1,2-diphenylcyclopentane-1,2-diol: application as initiators for ring-opening polymerization of ∊-caprolactone

“…However, most triarylcyclopentadienes are mainly used for the synthesis of the corresponding organometallic cyclopentadienyl complexes. Up to date, the number of known triphenylcyclopentadienyl complexes of d- (Davies et al, 2000;Deck et al, 2006;Thornberry et al, 2000Thornberry et al, , 2004Wu et al, 2007;Xu et al, 2006Xu et al, , 2007Zhang et al, 2000;Zhang et al, 2003) and f-block metals (Visseaux et al, 2008;Minyaev et al, 2016;Roitershtein et al, 2012Roitershtein et al, , 2018 is rather limited, and they are still insufficiently studied. Various polyphenylcyclopentadienyl Tb complexes, including 1,2,4-triphenylcyclopentadienyl ones, display promising photophysical properties because of the presence of such a ligand, which serves as a ISSN 2056-9890 -type antenna for luminescence sensitization of lanthanides (Roitershtein et al, 2018).…”

“…Various polyphenylcyclopentadienyl Tb complexes, including 1,2,4-triphenylcyclopentadienyl ones, display promising photophysical properties because of the presence of such a ligand, which serves as a ISSN 2056-9890 -type antenna for luminescence sensitization of lanthanides (Roitershtein et al, 2018). Organometallic derivatives of d-and f-block metals with various triphenylcyclopentadienyl ligands may also be used in the catalytic polymerization of olefins (Thornberry et al, 2004;Visseaux et al, 2008;Minyaev et al, 2016;Xu et al, 2006Xu et al, , 2007Zhang et al, 2000;Zhang et al, 2003).…”