Task: Text Categorization
Input (English): Chris Wright was the first person to use this reaction with coordinated carbon dioxide nickel complexes and Nguyen performed "green" versions of this reaction without solvents to create ethyl trans-cinnamate. Used in the preparation of steroids, this reaction can also be used to produce large yields of unsaturated nitriles. Using excess lithium salts during the addition step allows selective formation of the product and is known as the Schlosser modification. For 10 points, name this reaction that reacts an aldehyde or ketone with an ylide to generate an alkene.
Output (English): Science