Prilezhaev Reaction
Prilezhaev Reaction Overview
The Prilezhaev Reaction, also known as Prileschajew reaction or Prilezhaev epoxidation, is a chemical process used to convert alkenes into epoxides using peroxy acids. This reaction is named after Nikolai Alexandrovich Prilezhaev, a Russian chemist who first reported it in 1909[2]. The reaction is significant in organic chemistry due to its ability to introduce oxygen atoms into alkenes, forming oxiranes (epoxides), which are valuable intermediates in various chemical syntheses.
Reaction Mechanism
The Prilezhaev Reaction proceeds through a mechanism commonly referred to as the "butterfly mechanism." This involves the intramolecular hydrogen bonding of the peracid at the transition state, leading to the electrophilic addition of the oxygen atom from the peroxy acid to the alkene. This process results in the formation of an epoxide and a molecule of the corresponding carboxylic acid as a byproduct[1][2]. The reaction is highly stereospecific, preserving the stereochemistry of the original alkene in the epoxide product. For example, a trans-olefin will lead to the formation of a trans-epoxide, while a cis-olefin will yield a cis-epoxide[2].
Reagents and Conditions
Meta-chloroperoxybenzoic acid (m-CPBA) is the most commonly used reagent for the Prilezhaev Reaction due to its stability and good solubility in most organic solvents[2][4]. Other reagents that can be used include magnesium monoperphthalate and peracetic acid[1]. The reaction is typically carried out in inert solvents such as hexane, benzene, dichloromethane, chloroform, or carbon tetrachloride, at temperatures ranging from -10 to 60 °C[2].
Applications
Epoxides produced through the Prilezhaev Reaction can be further transformed into various functional groups by ring-opening reactions, making this process highly versatile in organic synthesis[3]. The reaction is particularly important for the synthesis of glycols or polyoxoalkylenes, which find applications as detergents, lubricants, waxes, and components of hydraulic liquids[4].
Conclusion
The Prilezhaev Reaction is a cornerstone in the field of organic chemistry, enabling the efficient and stereospecific conversion of alkenes into valuable epoxide intermediates. Its broad applicability, combined with the straightforward reaction conditions and the availability of reagents like m-CPBA, makes it a widely used method for epoxide synthesis in both academic research and industrial applications.
Citations:
[1] https://www.organic-chemistry.org/namedreactions/prilezhaev-reaction.shtm
[2] https://en.wikipedia.org/wiki/Prilezhaev_reaction
[3] https://mychemblog.com/peracid-oxidation-oxidation-of-carbon-carbon-double-bond-epoxidation-prilezhaev-reaction/
[4] https://www.thermofisher.com/us/en/home/chemicals/learning-center/organic-chemistry-resources/electrophilic-addition-reactions/prilezhaev-reaction.html
[5] https://en.chem-station.com/reactions-2/2014/05/prilezhaev-epoxidation.html
[6] https://onlinelibrary.wiley.com/doi/10.1002/9780470638859.conrr513
[7] https://www.youtube.com/watch?v=n2RuVIJNKFc
[8] https://www.youtube.com/watch?v=GJVtN4ZNmXk
[9] https://openi.nlm.nih.gov/detailedresult?img=PMC3921943_TSWJ2014-756418.sch.002&query=ALL&req=4&simResults=PMC2746572_pmc-2008-081f5&uniq=1
[10] https://chemistry-reaction.com/prilezhaev-reaction/
[11] https://synarchive.com/named-reactions/prilezhaev-reaction
[12] https://www.thermofisher.com/es/en/home/chemicals/learning-center/organic-chemistry-resources/electrophilic-addition-reactions/prilezhaev-reaction.html
[13] https://www.organicchemistrytutor.com/topic/synthesis-of-epoxides/