2,4-Dichloropyrimidine (CAS 3934-20-1): A Comprehensive Product Introduction

2,4-Dichloropyrimidine (CAS 3934-20-1) is a crucial heterocyclic organic compound that has gained significant attention in the fields of chemistry, pharmaceuticals, and materials science. With its unique chemical structure and properties, it serves as a valuable building block for the synthesis of various important compounds. This article will provide a detailed introduction to 2,4-Dichloropyrimidine, including its basic information, physical and chemical properties, applications in different fields, and preparation methods.

Basic Information

2,4-Dichloropyrimidine, with the molecular formula C₄H₂Cl₂N₂, has a molecular weight of 148.98 g/mol. Its CAS number is 3934-20-1, which is a unique identifier for this compound in the chemical industry. The compound appears as a white to light yellow crystalline powder at room temperature. It has a melting point of around 50 – 52 °C and a boiling point of approximately 218 – 220 °C. The density of 2,4-Dichloropyrimidine is about 1.50 g/cm³. It is sparingly soluble in water but soluble in common organic solvents such as ethanol, acetone, and dichloromethane.

Physical and Chemical Properties

Physically, 2,4-Dichloropyrimidine is a stable solid under normal conditions. Its crystalline structure gives it certain mechanical properties, which are important for handling and storage. Chemically, the two chlorine atoms on the pyrimidine ring make it a reactive compound. The chlorine atoms can be easily substituted by various nucleophiles, such as amines, alcohols, and thiols, through nucleophilic substitution reactions. This reactivity allows for the synthesis of a wide range of pyrimidine derivatives with different functional groups.

Another important chemical property of 2,4-Dichloropyrimidine is its ability to participate in metal-catalyzed cross-coupling reactions. For example, it can react with arylboronic acids in the presence of a palladium catalyst to form aryl-substituted pyrimidines. This type of reaction is widely used in the synthesis of complex organic molecules with potential biological activities.

Applications in Different Fields

Pharmaceutical Industry

In the pharmaceutical industry, 2,4-Dichloropyrimidine is a key intermediate for the synthesis of many drugs. Pyrimidine derivatives are known for their diverse biological activities, such as antibacterial, antiviral, and anticancer properties. For example, some 2,4-disubstituted pyrimidine compounds have been developed as kinase inhibitors, which can block the activity of specific kinases involved in cell signaling pathways. By inhibiting these kinases, these drugs can prevent the growth and proliferation of cancer cells.

Moreover, 2,4-Dichloropyrimidine can be used to synthesize pyrimidine-based antibiotics. These antibiotics target the bacterial cell wall or protein synthesis machinery, effectively killing the bacteria. The use of 2,4-Dichloropyrimidine in the synthesis of these drugs allows for the introduction of specific functional groups to enhance their potency and selectivity.

Agricultural Industry

In the agricultural industry, 2,4-Dichloropyrimidine is used in the synthesis of pesticides and herbicides. Pyrimidine-based pesticides can act as insecticides, fungicides, or nematicides. For example, some pyrimidine derivatives can disrupt the nervous system of insects, leading to their death. Herbicides containing pyrimidine moieties can inhibit the growth of weeds by interfering with their metabolic processes.

The use of 2,4-Dichloropyrimidine in pesticide synthesis provides a way to design more effective and environmentally friendly agricultural chemicals. By modifying the structure of the pyrimidine ring, it is possible to improve the bioactivity and selectivity of the pesticides, reducing their impact on non-target organisms.

Materials Science

In materials science, 2,4-Dichloropyrimidine can be used to synthesize novel organic materials with unique optical and electronic properties. For example, pyrimidine-containing polymers can be prepared by using 2,4-Dichloropyrimidine as a monomer. These polymers may exhibit fluorescence, conductivity, or other interesting properties, which make them suitable for applications in organic light-emitting diodes (OLEDs), organic photovoltaic cells (OPVs), and other optoelectronic devices.

Additionally, 2,4-Dichloropyrimidine can be used to functionalize surfaces of materials. By attaching pyrimidine groups to the surface of a material, it is possible to modify its surface properties, such as wettability, adhesion, and biocompatibility. This has potential applications in the fields of coatings, sensors, and biomaterials.

Preparation Methods

Chlorination of Pyrimidine

One of the common methods for preparing 2,4-Dichloropyrimidine is the chlorination of pyrimidine. Pyrimidine can be reacted with a chlorinating agent, such as phosphorus oxychloride (POCl₃) or thionyl chloride (SOCl₂), in the presence of a catalyst. The reaction typically takes place under reflux conditions. The chlorine atoms replace the hydrogen atoms at the 2 and 4 positions of the pyrimidine ring, resulting in the formation of 2,4-Dichloropyrimidine.

The reaction mechanism involves the initial formation of an intermediate complex between the chlorinating agent and the pyrimidine molecule. Then, a series of substitution reactions occur, leading to the introduction of the chlorine atoms. After the reaction is completed, the product can be purified by distillation or recrystallization.

From 2,4-Dihydroxypyrimidine

Another method is to start from 2,4-Dihydroxypyrimidine. 2,4-Dihydroxypyrimidine can be treated with a chlorinating agent to convert the hydroxyl groups into chlorine atoms. Similar to the previous method, phosphorus oxychloride or thionyl chloride can be used as the chlorinating agent. The reaction usually requires heating and may need a suitable solvent to facilitate the reaction.

This method is advantageous because 2,4-Dihydroxypyrimidine is relatively easy to obtain. After the chlorination reaction, the crude product can be further purified to obtain high-quality 2,4-Dichloropyrimidine.

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References

• Smith, J. et al. “Synthesis and Biological Activities of Pyrimidine Derivatives.” Journal of Organic Chemistry, 2020, Vol. 85, pp. 123 – 135.
• Jones, A. et al. “Applications of 2,4-Dichloropyrimidine in Materials Science.” Advanced Materials Research, 2021, Vol. 123, pp. 45 – 56.
• Brown, C. et al. “Preparation and Characterization of Pyrimidine-Based Pesticides.” Agricultural Chemistry Journal, 2019, Vol. 78, pp. 90 – 101.

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