Diazomethane is a yellow, highly reactive organic compound with the formula CH2N2. It is primarily used in organic chemistry for the methylation of carboxylic acids and other functional groups. Due to its reactivity, it must be handled with care, as it can be explosive under certain conditions. This compound is typically generated in situ, meaning it is produced right before use to minimize risks. Diazomethane is also known for its role in the synthesis of various nitrogen-containing compounds, making it valuable in research and industrial applications.