European Journal of Chemistry

Benzoin condensation of aromatic aldehydes catalyzed by N-heterocyclic carbenes under mild conditions


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Isabel Monreal-Leyva
Breanna Rose Attema
Nuri Bae
Haishi Cao
Hector Palencia


The benzoin condensation was used to evaluate the catalytic activity of different N-heterocyclic carbenes as a function of their structure and N-substituents. There is a correlation between the length of an N-alkyl substituent and its performance as an organocatalyst. Heteroaromatic aldehydes were found to be the most reactive, among the screened substrates, finishing the reaction in 30 minutes, with almost quantitative yields. On the other hand, p-nitrobenzaldehyde, a strongly electrophilic aldehyde, was the least reactive. Electronic effects have little influence on the reaction yield but steric effects can dramatically reduce it. The preformed organocatalyst reacts faster than the generated in situ, with minimum solvent.

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How to Cite
Monreal-Leyva, I.; Attema, B. R.; Bae, N.; Cao, H.; Palencia, H. Benzoin Condensation of Aromatic Aldehydes Catalyzed by N-Heterocyclic Carbenes under Mild Conditions. Eur. J. Chem. 2019, 10, 1-6.

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