641626-75-7

Upstream product

• 91-20-3 naphthalene 
• 920-46-7 Methacryloyl chloride 
• 107777-19-5 2-methyl-3-naphthalen-2-ylpropionic acid 
• 7646-78-8 tin(IV) chloride 
• 66-99-9 β-naphthaldehyde 
• 150096-57-4 2-methyl-2,3-dihydro-cyclopenta[a]naphthalen-1-one 
• 106359-68-6 (E)-2-methyl-3-(naphthalen-2-yl)acrylic acid 
• 151074-61-2 diethyl 2-methyl-2-(naphthalen-2-ylmethyl)malonate 
• 641626-72-4 2-methyl-3-naphthalen-2-ylpropionoc acid methyl ester 
• 641626-73-5 2-methyl-3-naphthalen-2-ylpropionyl chloride 
• 870273-38-4 4,5-Dichloro-2-((1S,5R,7R)-10,10-dimethyl-3,3-dioxo-3λ⁶-thia-4-aza-tricyclo[5.2.1.0^1,5]decane-4-carbonyl)-benzoic acid (1S,2S)-2-methyl-2,3-dihydro-1H-cyclopenta[a]naphthalen-1-yl ester 
• 870273-39-5 4,5-Dichloro-2-((1S,5R,7R)-10,10-dimethyl-3,3-dioxo-3λ⁶-thia-4-aza-tricyclo[5.2.1.0^1,5]decane-4-carbonyl)-benzoic acid (1R,2S)-2-methyl-2,3-dihydro-1H-cyclopenta[a]naphthalen-1-yl ester 
• 870273-42-0 (1S,2S)-(+)-2-methyl-2,3-dihydro-1H-benz[e]inden-1-ol 
• 870273-43-1 (1R,2S)-(-)-2-methyl-2,3-dihydro-1H-benz[e]inden-1-ol 

Downstream Products

• 870273-44-2 (S)-(-)-2-methyl-2,3-dihydro-1H-benz[e]inden-1-one 

Relevant academic research and scientific papers

Transition metal compound, catalyst composition comprising same, and method for producing olefin polymer using same

The present invention provides a transition metal compound, a catalyst composition comprising the same, and a method for producing an olefin polymer using the catalyst composition, the transition metal compound being capable of exhibiting high activity in olefin polymerization reaction, and also being capable of easily controlling the physical properties of an olefin polymer. When the transition metal compound is used, it is possible to provide an olefin polymer having an excellent energy-saving effect at the time of processing or molding.

Fluorine-Substituted Molecular Motors with a Quaternary Stereogenic Center

A series of unprecedented second generation molecular motors featuring a quaternary stereogenic center substituted with a fluorine atom has been synthesized. It is demonstrated that a seemingly benign replacement of the stereogenic hydrogen for a fluorine atom, regarded as a common substituent in pharmacology, resulted in a dramatic change in the energetic profile of thermal helix inversion. The barrier for the thermal helix inversion was found to increase considerably (by 20–30 kJ mol?1), presumably due to destabilization of the transition state by increased steric hindrance when the fluorine atom is forced to pass over the lower half of the motor. This results in the activation barrier for the thermal helix inversion to be higher than the barrier for backward thermal E–Z isomerization, impairing the motor function. A fluorine-substituted motor capable of performing unidirectional rotation is successfully prepared when these limitations are considered in the design phase.

Fine tuning of the rotary motion by structural modification in light-driven unidirectional molecular motors

The introduction of bulky substituents at the stereogenic center of light-driven second-generation molecular motors results in an acceleration of the speed of rotation. This is due to a more strained structure with elongated C=C bonds and a higher energy

A new model of light-powered chiral molecular motor with higher speed of rotation, part 1 - Synthesis and absolute stereostructure

To develop a molecular motor with a higher speed of rotation, a new model light-powered chiral molecular motor 2 of five-membered ring type was designed, and the motor rotation isomers (-)-2a and (-)-2c were directly synthesized in enantiopure forms for the first time from the ketone (+)-8. The precursor alcohols 9 and 10 were enantioresolved by the camphorsultam-dichlorophthalic acid (CSDP acid; 3) method, and their absolute configurations were determined by X-ray crystallographic analysis of the CSDP ester (-)-11b and chemical correlations. The enantiopure ketone (S)-(+)-8 formed from (1S,2S)-(+)-9 or (1R,2S)-(-)-10 was subjected to the McMurry reaction with TiCl 3/LiAlH4, yielding the motor rotation isomers [CD(-)257.8]-(2S,2′S)-(M,M)-(E)-(-)-2a and [CD(-)270.0]-(2S,2′S)-(M, M)-(Z)-(-)-2c. These studies enabled us unambiguously to determine the absolute stereo-structure of the motor 2, which is of critical importance for control over the direction of motor rotation. Wiley-VCH Verlag GmbH & Co. KGaA, 2005.

Increased Speed of Rotation for the Smallest Light-Driven Molecular Motor

In this paper we present the smallest artificial light-driven molecular motor consisting of only 28 carbon and 24 hydrogen atoms. The concept of controlling directionality of rotary movement at the molecular level by introduction of a stereogenic center n

Process for preparing 1-indanones

The present invention relates to a process for preparing 1-indanones of formula I: and isomers thereof, wherein R1, R2, R3, R4, R5, and R6 independently represent H or a C1-C20 hydrocarbon group or R1 and R2 or R2 and R3 or R3 and R4 and/or R5 and R6 together with the carbon atoms to which they are attached form a saturated or unsaturated 5- or 6-membered ring, said hydrocarbon group and/or said ring optionally containing one or more hetero atoms, said ring optionally being substituted with a C1-C4 hydrocarbon group, said process comprising reacting a compound of formula II: wherein R1, R2, R3, R4, R5, and R6 have the same meaning as defined above, with a chlorinating agent, followed by reaction with a Friedel-Crafts catalyst. The invention further relates to the preparation of the corresponding indenes.

Control of stereoerror formation with high-activity "dual-side" zirconocene catalysts: A novel strategy to design the properties of thermoplastic elastic polypropenes

The new C1-symmetric complexes rac-[1-(9-η5-fluorenyl)-2-(2-methylbenz[e]-1-η 5-indenyl)ethane]-zirconium dichloride (14a), rac-[1-(9-η5-fluorenyl)-2-(4,5-cyclohexa-2-methyl-1-η 5-indenyl)ethane]zirconium dichloride (14b), and rac-[1-(9-η5-fluorenyl)-2-(5,6-cyclopenta-2-methyl-l-η 5-indenyl)ethane]zirconium dichloride (15) were prepared in up to 93% yield. These compounds, activated with methyl aluminoxane, exhibit high active propene polymerization rates which remain constant over hours, even at elevated polymerization temperatures of 50 and 70°C. The two different coordination sites of these "dual-side" catalysts lead to isotactic polypropenes with variable amounts of stereoerrors, depending on the monomer concentration. The 2-methyl substituent of the indenyl ligands results, at the same time, in significantly increased molecular weights of the polymer products (up to 2.3 × 105 g mol-1), the bulk properties of which can be adjusted from flexible, semicrystalline thermoplastic to excellent thermoplastic elastic.

Process of preparing 2-alkyl-2,3-dihydro-1H-benz ?e!indene-1-one derivatives

The invention relates to a process of preparing a 2-alkyl-2,3-dihydro-1H-benz?e!indene-1-one derivative, preferably 2,3-dihydro-2-methyl-benz?e!indene-1-one, characterized in that a naphthalene derivative is condensed with an active ester of 2-alkyl-2-propenoic acid, preferably with 2-methyl-2-propenoyl chloride. The product which is obtained in high yield and substantially free from its isomer is an intermediate in the preparation of rac-dimethyl bis(2-alkyl-1H-benz?e!indenyl)silandiyl zirconium dichloride complex.

Process for the preparation of substituted indenes and their use as ligand systems for metallocene catalysts

The invention relates to a process for the preparation of a compound of the formula IV or IVa STR1 in which R1 -R5 are preferably hydrogen or alkyl, which comprises reacting a compound I STR2 with a compound II STR3 in which X1 and X2 are preferably halogen, to give the corresponding indanones, which are converted into the compounds IV and IVa by reduction and dehydration. The compounds IV and IVa are important intermediate products for the preparation of chiral metallocene complexes which are suitable catalyst components for olefin polymerization.