Topic
Aquation
About: Aquation is a research topic. Over the lifetime, 1443 publications have been published within this topic receiving 17507 citations.
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TL;DR: In this article , the authors demonstrate that the aqua species dramatically accelerate both β-elimination of the metallacyclobutane intermediate and bimolecular decomposition of four-coordinate [RuCl(H2O)n(L)(=CHR)]Cl.
Abstract: Water is ubiquitous in olefin metathesis, at levels ranging from contaminant to cosolvent. It is also non-benign. Water-promoted catalyst decomposition competes with metathesis, even for “robust” ruthenium catalysts. Metathesis is hence typically noncatalytic for demanding reactions in water-rich environments (e.g., chemical biology), a challenge as the Ru decomposition products promote unwanted reactions such as DNA degradation. To date, only the first step of the decomposition cascade is understood: catalyst aquation. Here we demonstrate that the aqua species dramatically accelerate both β-elimination of the metallacyclobutane intermediate and bimolecular decomposition of four-coordinate [RuCl(H2O)n(L)(=CHR)]Cl. Decomposition can be inhibited by blocking aquation and β-elimination.
5 citations
TL;DR: In this paper, the acid-catalysed aquation of polyamine chelates of NiII has been characterised both optically and kinetically by means of a rapid-scanning spectrometer.
Abstract: Successive stages in the acid-catalysed aquation of several polyamine chelates of NiII have been characterised both optically and kinetically by means of a rapid-scanning spectrometer. Complete spectra of several new transient intermediates are reported and assigned. When two terdentate ligands, viz. diethylenetriamine (dien), are involved it is established that one is completely removed in two stages before the second starts to disengage. The stepwise acid dissociation of the [Ni(trien)(OH2)2]2+ ion (trien = triethylenetetramine) is shown to be much more complex than had previously been indicated.
5 citations
TL;DR: In this paper, the reduction and the oxidation of the nitrite of the Nitro-ammine-cobalt(III) complexes are much slower than that of the free nitrite.
5 citations
TL;DR: In this paper, the acid-catalyzed aquation reactions of Co(NH3)5OCO2+, β-cis-Co(edda)CO3− and Co(nta) CO32− were re-investigated using rapid scan spectrophotometry.
5 citations
TL;DR: In this article, the authors investigated the reaction of Cr(VI) in concentrated hydrochloric acid or concentrated sulfuric acid, as well as evaluate the products formed when complexing anions are present during the reaction.
Abstract: The present study was undertaken to investigate the reaction of Cr(VI) in concentrated hydrochloric acid or concentrated sulfuric acid, as well as to evaluate the products formed when complexing anions are present during the reaction. The results show that trace level Cr(VI) is rapidly reduced to Cr(III) in both 37% HCI and 98% H2SO4 in the absence of conventional reducing agents and that the initial products are, respectively, CrCl3(H2O)3 and Cr(H2O)2(SO4)2-}, which undergo slow aquation reactions at pH 1, giving Cr(H2O)63+.
5 citations