Singlet carbenes are a type of reactive intermediate in organic chemistry, characterized by having two unpaired electrons in a singlet state. Unlike triplet carbenes, which have their unpaired electrons in separate orbitals, singlet carbenes have both electrons paired in the same orbital. This unique electronic configuration makes them highly reactive and short-lived, often participating in various chemical reactions, such as addition reactions and insertion reactions. These carbenes can be generated through different methods, including thermal decomposition or photolysis of precursors. Due to their reactivity, singlet carbenes are important in synthetic chemistry, where they can be used to create complex organic molecules. Their study helps chemists understand fundamental reaction mechanisms and develop new synthetic strategies.