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What does bergman cyclization mean?
- Bergman cyclization
- The Bergman cyclization or Bergman reaction or Bergman cycloaromatization is an organic reaction and more specifically a rearrangement reaction taking place when an enediyne is heated in presence of a suitable hydrogen donor (Scheme 1). It is the most famous and well-studied member of the general class of cycloaromatization reactions. It is named for the American chemist Robert G. Bergman (b. 1942). The reaction product is a derivative of benzene. The reaction proceeds by a thermal reaction or pyrolysis (above 200 °C) forming a short-lived and very reactive para-benzyne biradical species. It will react with any hydrogen donor such as 1,4-cyclohexadiene which converts to benzene. When quenched by tetrachloromethane the reaction product is a 1,4-dichlorobenzene and with methanol the reaction product is benzyl alcohol. When the enyne moiety is incorporated into a 10-membered hydrocarbon ring (e.g. cyclodeca-3-ene-1,5-diyne in scheme 2) the reaction, taking advantage of increased ring strain in the reactant, is possible at the much lower temperature of 37 °C. Naturally occurring compounds such as calicheamicin contain the same 10-membered ring and are found to be cytotoxic.
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"bergman cyclization." Abbreviations.com. STANDS4 LLC, 2024. Web. 30 Apr. 2024. <https://www.abbreviations.com/bergman%20cyclization>.
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