Reactions at high pressure. Part 8. The mechanisms of acid catalysed hydrolyses of glycosides
- 1 January 1982
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 1,p. 101-103
- https://doi.org/10.1039/p29820000101
Abstract
Rates of acid-catalysed hydrolysis for 19 glycosides, both furanosides and pyranosides, have been measured at pressures between 1 and 1 500 bar.‡ Volumes of activation have been determined for these reactions and were found to show a markedly parallel trend to the entropies of activation for the same reactions. In particular, alkyl furanosides have ΔV with combining macron]">– 2 to –10 cal K–1 mol–1§ while the corresponding pyranosides have ΔV with combining macron]">= 10–17 cal K–1 mol–1. It is inferred that the former react by an A2 mechanism and the latter by an A1 type.Keywords
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