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More than 25 million people died in Europe from the bubonic plague (the black death) in five years, from 1347 to 1352.


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Wurtz reaction Chem.
An organic chemical reaction to prepare alkanes by reacting a haloalkane with sodium:

2R-X + 2Na → 2NaX + R-R

Where R-X is the haloalkane and R is the alkyl group. The haloalkane and sodium is refluxed in dry ether. The reaction is named after the French chemist Charles-Adolphe Wurtz (1817-1884). It is known as a coupling reaction of two hydrocarbon group via a new C-C bond.

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