An ylide or ylids is a neutral, dipolar molecule with both of its atoms having complete octets of electrons. It typically consists of a heteroatom with a formal positive charge (often nitrogen, phosphorus, or sulphur) immediately connected to a nominally negatively charged atom. As a result, two nearby atoms are joined together by both an ionic and a covalent connection, forming a structure. As a result, ylides are 1,2-dipolar molecules and a type of zwitterions. As reagents or reactive intermediates, they can be found in organic chemistry. The Wittig reaction, a technique for converting ketones and specifically aldehydes to alkenes, makes use of phosphonium ylides. A phosphorus atom with three phenyl substituents and a link to a carbanion carries the positive charge in these Wittig reagents.
Stanislaw Dzwigaj
Sorbonne University, France
Victor Cerda
University of the Balearic Island, Spain
Dai Yeun Jeong
Asia Climate Change Education Center and Jeju National University, Korea, Republic of
Vladislav Sadykov
Boreskov Institute of Catalysis and Novosibirsk State University, Russian Federation
Eva Faillace
University of Corsica, France
Eduardo Bernad
Aragon Hydrogen Foundation, Spain
Anastasia Eleni Eleana Kordouli
University of Patras, Greece
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Stanislaw Dzwigaj, Sorbonne University, France
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