Dissociation of Mg(II) and Zn(II) complexes of simple 2-oxocarboxylates-relationship to CO fixation, and the Grignard and Barbier reactions
Organic and Biomolecular Chemistry, ISSN: 1477-0520, Vol: 15, Issue: 32, Page: 6813-6825
2017
- 6Citations
- 2Captures
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Metrics Details
- Citations6
- Citation Indexes6
- CrossRef6
- Captures2
- Readers2
Article Description
Three deprotonated 2-oxocarboxylic acids, glyoxylate, pyruvate, and 2-oxobutyrate (RCOCO, R = H, CH, CHCH) have been associated with MgCl and ZnCl to generate [RCOCOMCl] (M = Mg, Zn) complexes. Upon collision-induced dissociation these complexes all undergo efficient eliminations of CO and CO, via an intermediate [RCOMCl] product, to ultimately give [RMCl] products. The pyruvate and 2-oxobutyrate complexes also undergo efficient elimination of HCl to produce the enolate-metal complexes [HCCOCOMCl] and [HCHCCOCOMCl]. These enolate complexes have binding motifs reminiscent of the active centres in some CO-fixating enzymes and the CO reactivity of these enolate complexes was therefore investigated, but only adduct formation could be observed. Quantum chemical calculations predict the magnesium complexes to decarboxylate without reverse barriers to carboxylation, and the zinc complexes to decarboxylate with considerable reverse barriers. The subsequent CO loss occurs with reverse barriers in all cases. The HCl loss is also predicted to occur overall without reverse barriers for both metals.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85027506592&origin=inward; http://dx.doi.org/10.1039/c7ob01327b; http://www.ncbi.nlm.nih.gov/pubmed/28782776; https://xlink.rsc.org/?DOI=C7OB01327B; http://xlink.rsc.org/?DOI=C7OB01327B; http://pubs.rsc.org/en/content/articlepdf/2017/OB/C7OB01327B; https://dx.doi.org/10.1039/c7ob01327b; https://pubs.rsc.org/en/content/articlelanding/2017/ob/c7ob01327b
Royal Society of Chemistry (RSC)
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