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Henri Étienne Sainte-Claire Deville (11 March 1818 – 1 July 1881) was a French chemist.
He was born in the island of St Thomas in the Danish West Indies, where his father was French consul.
Discovered toluene and anhydrous nitric acid (nitrogen pentoxide)
In 1854 he succeeded in obtaining metallic aluminium, and ultimately he devised a method by which the metal could be prepared on a large scale by the aid of sodium, the manufacture of which he also developed. Together with Friedrich Wöhler, he discovered silicon nitride in 1857. He also pioneered many other developments in the field of chemistry and metallurgy.
For much more information, see Wikipedia entry.