Direct and quantitative monitoring of catalytic organic reactions under heterogeneous conditions using direct analysis in real time mass spectrometry

This new method overcomes problems of conventional analytical methodologies such as light scattering and sampling reproducibility issues. We used this method for mechanistic studies of catalytic reactions under heterogeneous conditions. Direct-type hydroxymethylation reactions and Mukaiyama-type hyd...

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Bibliographic Details
Published in:Chemical science (Cambridge) 2020-05, Vol.11 (19), p.515-5112
Main Authors: Masuda, Koichiro, Kobayashi, Sh
Format: Article
Language:English
Subjects:
Catalysts
Chemical reactions
Chemistry
Coordination compounds
Dependence
Light scattering
Mass spectrometry
Reaction kinetics
Scandium
Substrates
Technical information
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Summary:This new method overcomes problems of conventional analytical methodologies such as light scattering and sampling reproducibility issues. We used this method for mechanistic studies of catalytic reactions under heterogeneous conditions. Direct-type hydroxymethylation reactions and Mukaiyama-type hydroxymethylation reactions both catalyzed by a scandium-bipyridine ligand complex under micellar conditions were employed as examples of heterogeneous reactions. For direct-type hydroxymethylation reactions, initial reaction rate assays revealed first-order dependency on both substrate and catalyst. On the other hand, Mukaiyama-type hydroxymethylation reactions showed first-order rate dependency on substrate, zero-order on catalyst and saturation kinetics on formaldehyde. A direct and quantitative method for monitoring heterogeneous organic reactions has been developed by using direct analysis in real time mass spectrometry (DART-MS) with an isotope-labeled reaction product as an internal standard.
ISSN:2041-6520
2041-6539
DOI:10.1039/d0sc00021c