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Sands KN, Tuck TA, Back TG. Cyclic Seleninate Esters, Spirodioxyselenuranes and Related Compounds: New Classes of Biological Antioxidants That Emulate Glutathione Peroxidase. Chemistry 2018. [DOI: 10.1002/chem.201800182] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Kai N. Sands
- Department of Chemistry; University of Calgary; 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
| | - Tyler A. Tuck
- Department of Chemistry; University of Calgary; 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
| | - Thomas G. Back
- Department of Chemistry; University of Calgary; 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
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Aitken HM, Horvat SM, Coote ML, Lin CY, Schiesser CH. Rate Coefficients for Intramolecular Homolytic Substitution of Oxyacyl Radicals at Sulfur. Aust J Chem 2013. [DOI: 10.1071/ch12477] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
It is predicted on the basis of ab initio and density functional calculations that intramolecular homolytic substitution of oxyacyl radicals at the sulfur atom in ω-alkylthio-substituted radicals do not involve hypervalent intermediates. With tert-butyl as the leaving radical, free energy barriers ΔG‡ (G3(MP2)-RAD) for these reactions range from 45.8 kJ mol–1 for the formation of the five-membered cyclic thiocarbonate (8) to 56.7 kJ mol–1 for the formation of the six-membered thiocarbonate (9). Rate coefficients in the order of 104–106 s–1 and 101–104 s–1 for the formation of 8 and 9, respectively, at 353.15 K in the gas phase are predicted at the G3(MP2)-RAD level of theory.
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