- Indanyl-containing rare earth metal complex, preparation method thereof and application thereof
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The present invention discloses an indo-rare earth metal complex, and preparation method and application in isoprene / styrene polymerization, involving the preparation of polymer materials, specifically belongs to the field of thermoplastic elastomer rubber synthesis. The indanyl rare earth metal complex provided by the present invention can effectively catalyze isoprene / styrene copolymerization, the content of isoprene monomer and styrene monomer in the copolymer can be adjusted, thereby improving the physical and mechanical properties of the copolymer's thermal properties.
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Paragraph 0086; 0094-0095
(2022/01/20)
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- Easy Access to Versatile Catalytic Systems for C?H Activation and Reductive Amination Based on Tetrahydrofluorenyl Rhodium(III) Complexes
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On the basis of the 1,2,3,4-tetrahydrofluorenyl ligand, a simple approach was developed to new effective rhodium catalysts for the construction of C?C and C?N bonds. The halide compounds [(η5-tetrahydrofluorenyl)RhX2]2 (2
- Kharitonov, Vladimir B.,Runikhina, Sofiya A.,Nelyubina, Yulia V.,Muratov, Dmitry V.,Chusov, Denis,Loginov, Dmitry A.
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supporting information
p. 10903 - 10912
(2021/06/28)
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- Low viscosity alpha-olefin oligomer and preparation method thereof
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Use of oil as a base oil for lubricating oil Low viscosity alpha - olefin oligomers and methods of making the same are disclosed. The method of claim 1, further comprising the step of polymerizing an alpha 2 olefin monomer having from 3 carbon atoms in the presence of an olefin polymerization catalyst composition comprising at least one ansa - metallocene catalyst of Formula 2 - and the compound represented by Formula 20.
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Paragraph 0115; 0116
(2021/06/15)
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- Rhodium(II)- or Copper(I)-Catalyzed Formal Intramolecular Carbene Insertion into Vinylic C(sp2)?H Bonds: Access to Substituted 1H-Indenes
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A rhodium(II)- or copper(I)-catalyzed formal intramolecular carbene insertion into vinylic C(sp2)?H bonds is reported herein. This method provides straightforward access to 1H-indenes with high efficiency and excellent functional-group compatibility. Mechanistically, the reaction is proposed to involve the following sequence: metal carbene formation, intramolecular nucleophilic addition of the double bond to the electron-deficient carbene carbon atom, dearomatization, and finally a 1,5-H shift.
- Zhou, Qi,Li, Shichao,Zhang, Yan,Wang, Jianbo
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supporting information
p. 16013 - 16017
(2017/11/27)
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- Tetrahydrofluorenyl containing group 4 metallocenes useful as catalysts for the polymerization of olefins, process for their preparation and use of said metallocenes for the polymerization of olefins
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Novel silylene or ethylene bis(tetrahydrofluorenyl)metallocenes are synthesized and used as olefin polymerization catalysts.
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- Preparation process of fluorenes
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A tetrahydrofluorene, which is represented by the following formula (I) wherein R1 to R6 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, or R1 and R2 are combined together to represent ═O, ═N or ═S, R7 and R8 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a halogen atom, a hydroxyl group or a carboxyl group, is subjected to a hydrogen transfer reaction in the presence of a hydrogen acceptor and a catalyst, whereby a fluorene and a hydride of the hydrogen acceptor are formed at the same time.
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- Efficient synthesis of 2- and 3-substituted indenes from 2-bromobenzyl bromide through an enolate alkylation/Cr(II)/Ni(II)-mediated carbonyl addition sequence
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An efficient new synthesis of 2- and 3-substituted indenes has been developed based on the nickel-catalyzed chromium(II)-promoted addition of aryl bromides to a tethered ketone carbonyl. Several tethered bromoaryl ketones were prepared through enolate alk
- Halterman, Ronald L.,Zhu, Chengian
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p. 7445 - 7448
(2007/10/03)
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- Method for producing octahydrofluorenyl metal complexes
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Octahydrofluorenyl metal complexes, such as octahydrofluorenyltitanium trichloride, or ring substituted octahydrofluorenyl metal complexes wherein the metal is in the +2, +3 or +4 formal oxidation state are prepared by reduction of tetra- or hexa-hydrofluorenyl metal complexes. The reduction reaction may be carried out at ambient pressure and temperature in the presence of a catalyst. The process of the present invention permits preparation of octahydrofluorenyltitanium metal complexes from a series of high yield reactions starting with fluorene.
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- One-Step Annelation. A Convenient Method for the Preparation of Diols, Spirolactones, and Spiroethers from Lactones
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1-(ω-Hydroxyalkyl)cyclopentanols and -cyclohexanols were prepared in one step in high yields from butane-1,4-diyl- and pentane-1,5-diylmagnesium dibromides and lactones in tetrahydrofuran.This method was found to be general and applicable to lactones of any size (β, γ, δ, and ε) and structure whether aliphatic, aromatic, bicyclic, or spirocyclic.Evidently important steric hindrance close to the carbonyl group prevents annelation and attack on the second nucleophilic center of the Grignard reagent.Furthermore, in the case of oxetan-2-one one obtains, in additionto the corresponding diol, products resulting from scission of the C-O bond.The diols by appropriate transformation afford new routes to spirolactones and spiroethers.
- Canonne, Persephone,Foscolos, Georges B.,Belanger, Denis
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p. 1828 - 1835
(2007/10/02)
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