For chemists and engineers involved in organic synthesis and material science, a thorough understanding of intermediate compounds is essential. 4,4'-Dimethylbiphenyl (CAS 613-33-2), also known by synonyms like 4,4'-Ditolyl or Bi-p-tolyl, is a significant organic intermediate with a distinct profile. This article explores its typical synthesis routes and key physico-chemical properties that make it valuable for a wide array of industrial applications.

Synthesis Pathways for 4,4'-Dimethylbiphenyl

While various synthetic strategies exist, a common method for producing 4,4'-Dimethylbiphenyl involves coupling reactions of substituted benzene derivatives. One such approach is the Ullmann reaction or similar copper-catalyzed coupling of aryl halides, though modern methods often favor palladium-catalyzed cross-coupling reactions like Suzuki or Negishi couplings for higher yields and milder conditions. For instance, coupling of 4-methylphenylboronic acid or related organometallic reagents with a suitable 4-methylphenyl halide can effectively yield 4,4'-Dimethylbiphenyl. Another method mentioned involves oxidation reactions of toluene, though this is often a less direct route for achieving high purity.

Key Physico-Chemical Properties

The physical and chemical characteristics of 4,4'-Dimethylbiphenyl (C14H14, Molar Mass: 182.26 g/mol) are crucial for its application as an intermediate:

  • Appearance: It is typically supplied as a White to light yellow crystalline powder.
  • Melting Point: Generally reported in the range of 117-122℃, indicating a stable solid form at room temperature.
  • Boiling Point: Approximately 295℃ at 760 mmHg, signifying its low volatility under standard conditions.
  • Solubility: It exhibits good solubility in organic solvents such as ether, acetone, benzene, and carbon disulfide. However, it is practically insoluble in water.
  • Storage Sensitivity: The compound is described as easily absorbing moisture, necessitating storage in a dry, sealed container away from atmospheric humidity.

Applications and Procurement Considerations

The distinct properties of 4,4'-Dimethylbiphenyl lend themselves to its use as an intermediate in organic synthesis, particularly for materials science applications like liquid crystals and high-performance polymers, as well as in the pharmaceutical and agrochemical sectors. For businesses seeking to source this compound, understanding its synthesis ensures the quality and consistency needed for demanding applications. Partnering with manufacturers that can provide detailed specifications and reliable batch-to-batch quality is vital. For companies aiming to buy 4,4'-Dimethylbiphenyl, exploring options from established chemical manufacturers in China offers access to competitive pricing and robust supply chains.

By understanding the synthesis and properties of 4,4'-Dimethylbiphenyl, chemists and procurement specialists can make informed decisions to leverage this versatile intermediate for their specific industrial needs, ensuring both product quality and process efficiency.