C2H54Pb

C2H54Pb is the chemical formula for tetraethyllead. It is an organolead compound that was historically used as an additive in gasoline. Its primary function was to increase the octane rating of the fuel, preventing engine knocking. Tetraethyllead was introduced commercially in the 1920s and quickly became a standard component in most gasoline formulations worldwide.

The presence of lead in gasoline, however, led to significant environmental and health concerns. As the fuel burned, tetraethyllead released lead compounds into the atmosphere, contributing to widespread lead pollution. Exposure to lead, particularly in children, is known to cause serious neurological damage, developmental problems, and other health issues. Consequently, governments and international bodies began to phase out the use of leaded gasoline in the late 20th century.

The transition away from tetraethyllead was a major public health achievement. By the early 21st century, most countries had banned or severely restricted its use. While it is no longer a common gasoline additive, residual lead contamination from past use can still be found in soils and dust in many areas. The production and use of tetraethyllead have largely ceased, and it is now considered a substance of historical significance in the context of fuel additives and environmental policy.