3141-04-6

Upstream product

• 108-94-1 cyclohexanone 
• 542-92-7 cyclopenta-1,3-diene 
• 141-78-6 ethyl acetate 
• 67968-60-9 (1S*,2R*,6S*,7R*)-10-cyclohexylidene-4-oxa-tricyclo[5.2.1.02.6]-dec-8-ene-3,5-dione 
• 71-43-2 benzene 
• 132408-81-2 (1-Cyclohexen-1-yl)cyclopentadienyllithium 
• 75-78-5 dimethylsilicon dichloride 

Downstream Products

• 1546-10-7 1-cyclohex-1-en-1-yl-3-fluorobenzene 
• 75429-07-1 (1S,4S)-7-Cyclohexylidene-bicyclo[2.2.1]hepta-2,5-diene-2-carbonitrile 
• 125943-43-3 1-(1-methylcyclohexyl)cyclopenta-1,3-diene 
• 126457-78-1 1-cyclohexylcyclopenta-1,3-diene 
• 132408-81-2 (1-Cyclohexen-1-yl)cyclopentadienyllithium 
• 125943-44-4 2-(1-methylcyclohexyl)-6,6-pentamethylenefulvene 
• 132380-69-9 2-cyclohexyl-6,6-pentamethylenefulvene 
• 126116-89-0 C₁₇H₁₉^(1-)*Li⁽¹⁺⁾ 
• 75429-06-0 (1S,4S)-7-Cyclohexylidene-bicyclo[2.2.1]hepta-2,5-diene-2-carboxylic acid methyl ester 

Relevant academic research and scientific papers

Enantioselective 1,3-Dipolar [6+4] Cycloaddition of Pyrylium Ions and Fulvenes towards Cyclooctanoids

Organocatalytic enantioselective 1,3-dipolar [6+4] cycloadditions of pyrylium ion intermediates with fulvenes promoted by a chiral primary amine catalyst have been developed to proceed in moderate to good yields and high enantioselectivities. The resultant chiral bicyclo[6.3.0]undecane scaffold containing a transannular bridging ether is densely functionalised providing a rigid scaffold for further manipulations. Computational studies give important insights into the role of the primary amine catalyst. Analysis of the reaction shows that the catalytic reaction proceeds in a step-wise manner and rationalises the stereochemical outcome of the reaction. Several stereoselective complexity-generating transformations, facilitated by the diverse functional groups and transannular bridge, are presented, highlighting the versatility of the core towards a number of the cyclooctanoid natural products.

Visible-light-induced [4 + 2] cycloaddition of pentafulvenes by organic photoredox catalysis

We have developed thioxanthylium photoredox catalyzed [4 + 2] cycloaddition of pentafulvenes at room temperature under green light irradiation, which affords tetrahydrocyclopenta[b]chromenes with high regioselectivities. The present reaction provides a sustainable approach to carry out the cycloaddition of pentafulvenes without the use of transition metal catalysts or high-temperature conditions. This procedure enables a mild and straightforward access to 1,3a,9,9a-tetrahydrocyclopenta[b]chromenes. The quantum yield of the reaction (Φ = 0.15) indicates that the reaction would mainly proceed via photocatalytic pathways.

METALLOCENE COMPOUNDS, CATALYST COMPOSITIONS COMPRISING THE SAME, AND METHOD FOR PREPARING OLEFIN POLYMERS USING THE SAME

The present invention relates to a transition metal compound which can usefully adjust characteristics of synthesized olefin polymers such as chemical structures, molecular weight distribution, mechanical properties, etc. while exhibiting high activity during olefin polymerization reaction; to a catalyst composition comprising the same; and a preparation method of olefin polymer using the catalyst composition. The novel transition metal compound of the present invention can provide polyolefin with medium-low molecular weight for improving processability and is represented by chemical formula 1.COPYRIGHT KIPO 2016

METALLOCENE COMPOUNDS, CATALYST COMPOSITIONS COMPRISING THE SAME, AND METHOD FOR PREPARING OLEFIN POLYMERS USING THE SAME (AS AMENDED)

The present invention relates to a transition metal compound that may exhibit high activity in olefin polymerization, and easily control the properties of synthesized olefin polymer such as a chemical structure, molecular weight distribution, a mechanical property, and the like, a catalyst composition comprising the same, and a method for olefin polymerization using the catalyst composition.

Olefin high-temperature polymerization metallocene catalyst and preparation method thereof and application of olefin high-temperature polymerization metallocene catalyst in olefin polymerization

The invention discloses an olefin high-temperature polymerization metallocene catalyst and a preparation method thereof and an application of the olefin high-temperature polymerization metallocene catalyst in olefin polymerization. The metallocene catalys

Carbon-bridged tri(cyclopentadiene): Synthesis and coordination with ytterbium

Reaction of a mixture of 1,1-bis(cyclopentadienyl)cyclohexane and pentamethylenefulvene with metallic sodium in THF led to a mixture of cyclohexylidene-bridged bis(cyclopentadienyl) sodium and two-cyclohexylidenebridged tri(cyclopentadienyl) sodium. Reaction of the salt solutions with anhydrous YbCl3 in THF afforded a ytterbium complex mixed-ligated by bridged bis(cyclopentadienide) and bridged tri(cyclopentadienide).

Synthesis of cis,cis,cis-1-alkylidene-2,3,4,5-tetrakis(diphenylphosphinomethyl)cyclopentanes

A new strategy to prepare tetradentate or pentadentate diphenylphosphine ligands has been explored from Diels-Alder adducts of fulvenes and maleic anhydride. A tetradentate phosphine ligand, bearing a side chain allowing the formation of a bond with polys

Control of ansa-zirconocene stereochemistry by reversible exchange of cyclopentadienyl and chloride ligands

The reaction of Li2[Me2Si(3-R-C5H3)2] salts with Zr{Me3SiN(CH2)3NSiMe3}Cl2(THF)2 in THF quantitatively afforded rac-Me2Si(3

Kinetic resolution of chiral α-olefins using optically active ansa-zirconocene polymerization catalysts

A series of enantiopure C1-symmetric metallocenes, {(SiMe 2)2[η5-C5H(CHMe 2)2][η5-C5H2((S) CHMeCMe3)]}ZrCl2, (S)-2, {(SiMe2) 2[η5-C5H(CHEt2) 2][η5-C5H2((S)-CHMeCMe 3)]}ZrCl2, (S)-6, and {(SiMe2) 2[η5-C5HCy2][η5- C5H2((S)-CHMeCMe3)]}ZrCl2), (S)-7 (Cy = cyclohexyl), zirconocene dichlorides that have an enantiopure methylneopentyl substituent on the "upper" cyclopentadienyl ligand, and diastereomerically pure precatalysts, {(SiMe2) 2[η5-C5H((S)-CHMeCy)(CHMe 2)][η5-C5H3]}ZrCl2, (S)-8a and (S)-8b, which have an enantiopure, 1-cyclohexylethyl substituent on the "lower" cyclopentadienyl ligand, has been synthesized for use in the polymerization of chiral α-olefins. When activated with methylaluminoxane, these metallocenes show unprecedented activity for the polymerization of bulky racemic monomers bearing substitution at the 3- and/or 4-positions. Due to the optically pure nature of these single site catalysts, they effect kinetic resolution of racemic monomers: the polymeric product is enriched with the faster reacting enantiomer, while recovered monomer is enriched with the slower reacting enantiomer. The two components are easily separated. For most olefins surveyed, a partial kinetic resolution was achieved (s = kfaster/kslower ≈ 2), but, in one case, the polymerization of 3,4-dimethyl-1-pentene, high levels of separation were obtained (s > 15). 13C NMR spectroscopy of poly (3-methyl-1-pentene) produced with (S)-2 indicates that the polymers are highly isotactic materials. X-ray crystal structure determinations for (S)-2, {(SiMe2)2[η 5-C5H(CHMe2)2][η5- C5H2((S)-CHMeCMe3)]}Zr(SC6H 5)2, (S)-6, and (S)-7 have been used in combination with molecular mechanics calculations to examine the prevailing steric interactions expected in the diastereomeric transition states for propagation during polymerization. Precatalysts (S)-8a and (S)-8b are less selective polymerization catalysts for the kinetic resolution of 3-methyl-1-pentene than are (S)-2, (S)-6, and (S)-7.

New mono- and bi-nuclear ansa-metallocenes of zirconium and hafnium as catalysts for the polymerisation of ethene and propene

The new ansa-metallocenes [M{Me2C(η-C5H4)(η2-C 9H6)}(η-C5H5)Cl] [M = Zr (crystal structure) or, Hf], [M{(CH2)5C(η-C5H4)(η