Overview
Pyrrole, also known as azole, is a five-membered heterocyclic compound containing one nitrogen atom. It is a fundamental building block in organic chemistry, forming the core structure of many biologically active compounds. Pyrrole is naturally found in coal tar and is synthesized industrially for various applications. Its aromaticity and reactivity make it a versatile intermediate in the production of pharmaceuticals, dyes, and agrochemicals. Pyrrole derivatives, such as porphyrins, are crucial in biological systems, including hemoglobin and chlorophyll.
Physical and Chemical Properties
Pyrrole is a colorless to pale yellow liquid with a distinctive, mildly unpleasant odor. It has a boiling point of 129°C and a melting point of -23°C. The compound is weakly basic due to the lone pair of electrons on the nitrogen atom, which is part of the aromatic sextet. Pyrrole is soluble in most organic solvents but only slightly soluble in water. Its reactivity includes electrophilic substitution at the carbon atoms, making it valuable for synthesizing more complex molecules. The compound is flammable and should be handled with care to avoid exposure.
Main Applications
Pyrrole is widely used in the pharmaceutical industry as a precursor for drugs, including antibiotics and antipsychotics. Its derivatives are essential in agrochemicals, such as pesticides and herbicides, due to their biological activity. In the dye industry, pyrrole serves as a building block for synthetic dyes and pigments. Additionally, it is used in organic synthesis to create complex molecules for research and industrial applications. Its role in porphyrin synthesis is vital for producing compounds like heme, which is critical in oxygen transport in blood.
Safety and Storage
Pyrrole is flammable and should be stored in a cool, dry place away from heat sources and open flames. Proper ventilation is essential to prevent the accumulation of vapors, which can be harmful if inhaled. Personal protective equipment, such as gloves and goggles, should be worn when handling pyrrole to avoid skin and eye irritation. In case of spills, absorb with inert material and dispose of according to local regulations. Always refer to the material safety data sheet (MSDS) for detailed safety instructions.
B2B Procurement Guide
When procuring pyrrole, verify the CAS number (109-97-7) to ensure product authenticity. Check the purity specifications, as impurities can affect its performance in chemical reactions. Reliable suppliers should provide certificates of analysis (CoA) and comply with international safety standards. Bulk purchases may offer cost advantages, but ensure proper storage facilities are available. For reference, prices typically range from $50 to $100 per kg, depending on purity and quantity.
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