AI Article Synopsis
- Lanthanide triflates, like ytterbium and dysprosium, are effective Lewis acid catalysts for carbonyl compound reactions due to their strong attraction to oxygen and resistance to water.
- Despite their use, the specific catalytic species formed during these reactions remains unclear.
- Using mass spectrometry and ion spectroscopy, researchers have identified various intermediates in a catalyzed condensation reaction, revealing that the reactivity of these lanthanide complexes is influenced by their charge and suggesting that triply charged complexes are particularly important.
Article Abstract
Lanthanide triflates are effective Lewis acid catalysts in reactions involving carbonyl compounds due to their high oxophilicity and water stability. Despite the growing interest, the identity of the catalytic species formed in lanthanide catalysed reactions is still unknown. We have therefore used mass spectrometry and ion spectroscopy to intercept and characterize the intermediates in a reaction catalysed by ytterbium and dysprosium triflates. We were able to identify a number of lanthanide intermediates formed in a simple condensation reaction between a C-acid and an aldehyde. Results show correlation between the reactivity of lanthanide complexes and their charge state and suggest that the triply charged complexes play a key role in lanthanide catalysed reactions. Spectroscopic data of the gaseous ions accompanied by theoretical calculations reveal that the difference between catalytic efficiencies of ytterbium and dysprosium ions can be explained by their different electrophilicity.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6813638 | PMC |
| http://dx.doi.org/10.1002/ejoc.201900171 | DOI Listing |
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