Diazomethane is a chemical compound with the formula CH2N2. It is a yellow gas at room temperature and is known for its strong reactivity, particularly in organic synthesis. Diazomethane is often used to convert carboxylic acids into methyl esters, making it valuable in the field of organic chemistry. Due to its high reactivity, diazomethane must be handled with care, as it can be explosive under certain conditions. It is typically generated in situ, meaning it is produced and used immediately in reactions, minimizing risks associated with storage and transport.