Tetramethyllead

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What Wikipedia says

Tetramethyllead, also called tetra methyllead and lead tetramethyl, is a chemical compound used as an antiknock additive for gasoline. It is a methyl radical synthon. Its use in gasoline is being phased out for environmental considerations.

Excerpt from the Wikipedia article “Tetramethyllead”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Bert.Kilanowski, CC0, via Wikimedia Commons.