= Kurt Alder
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<Kurt Alder> and <Otto Diels> developed the <Diels-Alder reaction>, in which a <diene> with <pi conjugation> and a <dienophile> combine to build a six-membered ring. The transformation creates two carbon–carbon <chemical bonds> in one ring-forming step, explaining its importance in constructing complex organic <molecules>.<Diene synthesis and related reaction types by Kurt Alder>[Diene synthesis and related reaction types, Nobel lecture, 12 December 1950]{ref}
\Image[https://upload.wikimedia.org/wikipedia/commons/3/30/Kurt_Alder_Nobel.jpg]
{title=Portrait of <Kurt Alder>}
{description=Unknown author; Nobel Foundation. Public domain. https://commons.wikimedia.org/wiki/File:Kurt_Alder_Nobel.jpg[Source usage terms], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Kurt_Alder_Nobel.jpg}
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