7495-46-7

Basic information

• Product Name: 2,2',3,3'-Tetramethylbiphenyl
• Synonyms: 2,2',3,3'-Tetramethylbiphenyl
• CAS NO: 7495-46-7
• Molecular Formula: C₁₆H₁₈
• Molecular Weight: 0
• Mol File: 7495-46-7.mol
• Article Data: 6

Chemical Properties

• Appearance: /
• CAS DataBase Reference: 2,2',3,3'-Tetramethylbiphenyl(CAS DataBase Reference)
• NIST Chemistry Reference: 2,2',3,3'-Tetramethylbiphenyl(7495-46-7)
• EPA Substance Registry System: 2,2',3,3'-Tetramethylbiphenyl(7495-46-7)

Safety Data

• Hazardous Substances Data: 7495-46-7(Hazardous Substances Data)

Usage

Structure

Symmetric biphenyl derivative with four methyl groups attached to the two benzene rings.

Physical state

Colorless, viscous liquid.

Solubility

Insoluble in water, soluble in organic solvents.

Primary use

Heat transfer fluid in various industrial applications.

Thermal properties

High thermal stability and low volatility.

Secondary use

Chemical intermediate in the production of pharmaceuticals and agrochemicals.

Potential applications

Electronics, as a component of liquid crystals and organic semiconductors.

Safety precautions

May be harmful if ingested, inhaled, or in contact with the skin. Handle with caution.

Upstream product

• 31599-60-7 1-iodo-2,3-dimethylbenzene 
• 70729-00-9 2,2',3,3'-Tetramethyl-5,5'-di-tert-butylbiphenyl 
• 108-88-3 toluene 
• 615-60-1 4-chloro-1,2-dimethylbenzene 
• 608-23-1 3-chloro-o-xylene 
• 95-47-6 o-xylene 

Relevant articles and documents

Single-site metal-organic framework catalysts for the oxidative coupling of arenes: Via C-H/C-H activation

C-H activation reactions are generally associated with relatively low turnover numbers (TONs) and high catalyst concentrations due to a combination of low catalyst stability and activity, highlighting the need for recyclable heterogeneous catalysts with stable single-atom active sites. In this work, several palladium loaded metal-organic frameworks (MOFs) were tested as single-site catalysts for the oxidative coupling of arenes (e.g. o-xylene) via C-H/C-H activation. Isolation of the palladium active sites on the MOF supports reduced Pd(0) aggregate formation and thus catalyst deactivation, resulting in higher turnover numbers (TONs) compared to the homogeneous benchmark reaction. Notably, a threefold higher TON could be achieved for palladium loaded MOF-808 due to increased catalyst stability and the heterogeneous catalyst could efficiently be reused, resulting in a cumulative TON of 1218 after three runs. Additionally, the palladium single-atom active sites on MOF-808 were successfully identified by Fourier transform infrared (FTIR) and extended X-ray absorption fine structure (EXAFS) spectroscopy.

A method for preparing four methyl biphenyl

The invention provides a preparation method of tetramethyl biphenyl, which comprises the following steps: mixing halogenated o-xylene, magnesium metal, iodine, ether and transition metal catalyst, and reacting to obtain the tetramethyl biphenyl, wherein the mol ratio of ether to magnesium metal is (0.5-3):1. Compared with the prior art of synthesizing tetramethyl biphenyl from halogenated o-xylene, the invention has the following advantages: by using the raw material halogenated o-xylene as the solvent, the preparation of the format reagent and the coupling reaction are carried out in the initial raw material, so that the addition of abundant anhydrous solvent as the reaction medium is not needed, thereby lowering the reaction cost and simplifying the production technique; the magnesium metal is directly added into the halogenated o-xylene to obtain the format reagent, so the process is simple and the conditions are mild and controllable; and the raw material, the concentration of which in the reaction system is high, is used as the solvent and participates in the oxidation-reduction process in the coupling reaction, no oxidizer is needed, so the reaction conditions are mild and controllable.

Nafion-H Catalyzed De-tert-butylation of Aromatic Compounds

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