Overview
Methylquinoline, also known as quinaldine or 2-methylquinoline, is a heterocyclic organic compound belonging to the quinoline family. It is a colorless to pale yellow liquid with a distinctive aromatic odor. The compound is primarily synthesized through the Skraup reaction or by alkylation of quinoline. Methylquinoline serves as a versatile intermediate in organic synthesis, particularly in the production of pharmaceuticals, agrochemicals, and dyes. Its molecular structure, featuring a benzene ring fused to a pyridine ring with a methyl substituent, contributes to its reactivity and utility in various chemical processes.
Physical and Chemical Properties
Methylquinoline exhibits typical properties of aromatic heterocycles. It has a molecular weight of 143.19 g/mol and a density of 1.058 g/cm³. The liquid form has a melting point of -2°C and boils at 247°C, making it stable under normal storage conditions. The compound is soluble in most organic solvents such as ethanol, ether, and benzene, but only slightly soluble in water. Its weak basic nature allows it to form salts with strong acids. Methylquinoline is flammable and should be handled with care to avoid ignition sources. The compound's reactivity includes electrophilic substitution reactions, particularly at the 5- and 8-positions of the quinoline ring.
Main Applications
In the pharmaceutical industry, methylquinoline is used as a building block for antimalarial drugs and other medicinal compounds. Its derivatives show biological activity that makes them valuable in drug development. The agrochemical sector utilizes methylquinoline in the synthesis of pesticides and herbicides. Its ability to form complexes with metals also makes it useful as a corrosion inhibitor in industrial applications. Additionally, the compound serves as an intermediate in the production of dyes and pigments, particularly those requiring nitrogen-containing heterocycles.
Safety and Storage
Methylquinoline requires careful handling due to its potential health hazards. It is harmful if swallowed or inhaled and can cause skin and eye irritation. Proper personal protective equipment including gloves, goggles, and respiratory protection should be used when handling the chemical. Storage should be in cool, dry, well-ventilated areas away from heat sources and open flames. Containers should be tightly sealed and made of compatible materials such as stainless steel or certain plastics. In case of spills, absorb with inert material and dispose of according to local regulations.
B2B Procurement Guide
When procuring methylquinoline for industrial use, buyers should specify the required purity grade, as pharmaceutical applications typically require higher purity (98%+) than industrial uses. Request certificates of analysis and material safety data sheets from suppliers. Consider purchasing from manufacturers with ISO certification or other quality management systems in place. For large quantity orders, inquire about bulk discounts and verify transportation requirements, as methylquinoline may be classified as hazardous material for shipping purposes. Establish long-term supply agreements with reliable producers to ensure consistent quality and availability.
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