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Volume 220, 2019
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Bambusurils as a mechanistic tool for probing anion effects

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Abstract

Bambusuril macrocycles have high affinity towards anions (X) such as PF6 and SbF6 or BF4 and ClO4. Therefore, addition of bambusurils to reaction mixtures containing these anions effectively removes the free anions from the reaction process. Hence, comparing reactions with and without addition of bambusurils can demonstrate whether the anions actively participate in the reaction mechanism or not. We show this approach for gold(I) mediated addition of methanol to an alkyne. The reaction mechanism can proceed via monoaurated intermediates (e.g., in catalysis with [(IPr)AuX]) or via diaurated intermediates (e.g., in catalysis with [(PPh3)AuX]). We show that anions X slightly affect the reaction rates, however the effect stays almost the same even after their encapsulation in the cavity of bambusurils. We also demonstrate that X affects the overall reaction rate in the very same way as the reaction rate of the protodeauration step. All results are consistent with the indirect effect of X by the acidity of the conjugated acid HX on the rate-determining step. There is no evidence that a direct involvement of X would affect the reaction rate.

Graphical abstract: Bambusurils as a mechanistic tool for probing anion effects

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Article information


Submitted
16 Apr 2019
Accepted
03 Jun 2019
First published
04 Jun 2019

Faraday Discuss., 2019,220, 58-70
Article type
Paper

Bambusurils as a mechanistic tool for probing anion effects

L. Jašíková, M. Rodrigues, J. Lapešová, T. Lízal, V. Šindelář and J. Roithová, Faraday Discuss., 2019, 220, 58
DOI: 10.1039/C9FD00038K

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