Have you ever wondered why the gas station has “unleaded fuel” but there isn’t a “leaded” option? The answer has to do with a chemical called tetraethyl lead, which is an organometallic compound, or an organic compound with a carbon-metal bond. In this episode of Crash Course Organic Chemistry, we’ll learn all about organometallic compounds, including what they are and what kind of reactions we see them in. But beware! This class of compounds may be super useful, but also has a dark side.