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Izvorni znanstveni članak
Rates and Mechanism of Solvolysis of Arenediazonium Ions in Aqueous Trifluoroethanol
H. Maskill
; Chemistry Department, University of Newcastle upon Tyne, Newcastle upon Tyne, NE1 7RU, United Kingdom
Katharine McCrudden
; Chemistry Department, University of Newcastle upon Tyne, Newcastle upon Tyne, NE1 7RU, United Kingdom
| Puni tekst: engleski, pdf (17 MB) | str. 567-574 | citiraj | |
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APA 6th Edition Maskill, H. i McCrudden, K. (1992). Rates and Mechanism of Solvolysis of Arenediazonium Ions in Aqueous Trifluoroethanol. Croatica Chemica Acta, 65 (3), 567-574. Preuzeto s https://hrcak.srce.hr/137117 MLA 8th Edition Maskill, H. i Katharine McCrudden. "Rates and Mechanism of Solvolysis of Arenediazonium Ions in Aqueous Trifluoroethanol." Croatica Chemica Acta, vol. 65, br. 3, 1992, str. 567-574. https://hrcak.srce.hr/137117. Citirano 25.02.2021. Chicago 17th Edition Maskill, H. i Katharine McCrudden. "Rates and Mechanism of Solvolysis of Arenediazonium Ions in Aqueous Trifluoroethanol." Croatica Chemica Acta 65, br. 3 (1992): 567-574. https://hrcak.srce.hr/137117 Harvard Maskill, H., i McCrudden, K. (1992). 'Rates and Mechanism of Solvolysis of Arenediazonium Ions in Aqueous Trifluoroethanol', Croatica Chemica Acta, 65(3), str. 567-574. Preuzeto s: https://hrcak.srce.hr/137117 (Datum pristupa: 25.02.2021.) Vancouver Maskill H, McCrudden K. Rates and Mechanism of Solvolysis of Arenediazonium Ions in Aqueous Trifluoroethanol. Croatica Chemica Acta [Internet]. 1992 [pristupljeno 25.02.2021.];65(3):567-574. Dostupno na: https://hrcak.srce.hr/137117 IEEE H. Maskill i K. McCrudden, "Rates and Mechanism of Solvolysis of Arenediazonium Ions in Aqueous Trifluoroethanol", Croatica Chemica Acta, vol.65, br. 3, str. 567-574, 1992. [Online]. Dostupno na: https://hrcak.srce.hr/137117. [Citirano: 25.02.2021.] |
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Sažetak
Rates of solvolysis of benzenediazonium tetrafluoroborate and six of its methyl-substituted analogues have been measured in water, trifluoroethanol, and mixtures of the two over a range of temperatures. The enthalpies of activation are uniformly high and show only a low dependence upon the solvent composition. The entropies of activation are all appreciably positive and also show only small variations with the composition of the solvent. Methyl substituents in ortho and meta positions are modestly rate enhancing; a para- methyl is rate retarding. The results are discussed in terms of a mechanism involving an initial fragmentation of the diazonium ion into a phenyl cation - nitrogen molecule complex which then undergoes rate-limiting dissociation followed by product-forming capture of the phenyl cation by solvent molecules.
Hrčak ID: 137117
URI
https://hrcak.srce.hr/137117
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