= Otto Diels
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<Otto Diels> and <Kurt Alder> developed the <Diels-Alder reaction>, a <cycloaddition> joining a <diene> with <pi conjugation> with a <dienophile>. Its usefulness comes from building a six-membered ring while preserving a predictable relationship between the starting materials' spatial arrangement and the product's <stereochemistry>.<Diene synthesis and related reaction types by Kurt Alder>[Diene synthesis and related reaction types, 1950: diene synthesis and stereochemical relationships]{ref}
\Image[https://upload.wikimedia.org/wikipedia/commons/3/38/Otto_Paul_Hermann_Diels.jpg]
{title=Portrait of <Otto Diels>}
{description=Unknown author; Nobel Foundation. Public domain. https://commons.wikimedia.org/wiki/File:Otto_Paul_Hermann_Diels.jpg[Source usage terms], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Otto_Paul_Hermann_Diels.jpg}
{width=260}
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