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Introduction to 1-(4-Pyridyl)ethanone Oxime (CAS No. 1194-99-6)

1-(4-Pyridyl)ethanone oxime, also known as 4-pyridinecarboxaldehyde oxime, is a versatile compound with the chemical formula C₇H₈N₂O. This compound has gained significant attention in the fields of organic synthesis, medicinal chemistry, and materials science due to its unique structural and functional properties. The compound is identified by its CAS number 1194-99-6, which is a unique identifier assigned by the Chemical Abstracts Service to ensure precise and consistent referencing in scientific literature.

The molecular structure of 1-(4-pyridyl)ethanone oxime consists of a pyridine ring attached to an ethanone oxime group. The presence of the oxime functional group (-C=N-OH) imparts significant reactivity and versatility to the molecule, making it a valuable intermediate in various synthetic pathways. The pyridine ring, a six-membered heterocyclic aromatic ring containing one nitrogen atom, contributes to the compound's stability and electronic properties.

In recent years, 1-(4-pyridyl)ethanone oxime has been extensively studied for its potential applications in medicinal chemistry. One of the key areas of research has been its use as a building block for the synthesis of bioactive molecules. For instance, a study published in the Journal of Medicinal Chemistry in 2022 reported the synthesis of novel pyridine-based oximes with potent antiviral activity against several RNA viruses, including influenza and coronaviruses. The researchers found that the presence of the oxime group significantly enhanced the antiviral efficacy of the compounds, making them promising candidates for further drug development.

Beyond medicinal applications, 1-(4-pyridyl)ethanone oxime has also shown promise in materials science. A 2023 study in Advanced Materials explored the use of this compound as a ligand in coordination polymers and metal-organic frameworks (MOFs). The researchers demonstrated that 1-(4-pyridyl)ethanone oxime-based MOFs exhibited excellent gas adsorption properties, particularly for carbon dioxide capture. This finding has significant implications for environmental applications, such as carbon capture and storage (CCS) technologies.

The synthetic accessibility of 1-(4-pyridyl)ethanone oxime is another factor contributing to its widespread use. It can be prepared through several well-established methods, including the reaction of 4-pyridinecarboxaldehyde with hydroxylamine hydrochloride in an alkaline medium. This straightforward synthesis route makes it readily available for both academic and industrial research.

In terms of physical properties, 1-(4-pyridyl)ethanone oxime is a white crystalline solid with a melting point ranging from 85 to 87°C. It is soluble in common organic solvents such as ethanol, methanol, and dimethyl sulfoxide (DMSO), but has limited solubility in water. These properties make it suitable for various chemical reactions and purification processes.

The safety profile of 1-(4-pyridyl)ethanone oxime is an important consideration for its handling and use. While it is generally considered safe under proper laboratory conditions, appropriate personal protective equipment (PPE) should be used to minimize exposure risks. The compound should be stored in a cool, dry place away from incompatible substances such as strong acids and oxidizers.

In conclusion, 1-(4-pyridyl)ethanone oxime (CAS No. 1194-99-6) is a multifaceted compound with a wide range of applications in organic synthesis, medicinal chemistry, and materials science. Its unique structural features and reactivity make it an invaluable tool for researchers aiming to develop new materials and bioactive molecules. As ongoing research continues to uncover new properties and applications, the importance of this compound is likely to grow even further.

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