Claisen condensation

== English == === Etymology === Discovered by German chemist Rainer Ludwig Claisen. === Noun === Claisen condensation (countable and uncountable, plural Claisen condensations) (organic chemistry) A carbon–carbon bond-forming reaction that occurs between two esters or one ester and another carbonyl compound in the presence of a strong base, resulting in a β-keto ester or a β-diketone.