"By the mid-1800s, the new science of chemistry was developing rapidly and chemists had begun to probe the forces holding compounds together. In 1858, August Kekulé and Archibald Couper independently proposed that, in all organic compounds, carbon is tetravalent—it always forms four bonds when it joins other elements to form stable compounds. Furthermore, said Kekulé, carbon atoms can bond to one another to form extended chains of linked atoms. In 1865, Kekulé provided another major advance when he suggested that carbon chains can double back on themselves to form rings of atoms."
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John McMurry, Organic Chemistry 8th ed. (2012), Ch. 1 : Structure and Bonding
https://en.wikiquote.org/wiki/August_Kekul%C3%A9
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August Kekulé
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