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Croatica Chemica Acta, Vol.77 No.1-2 Svibanj 2004.

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Rotation Barriers in Pyridinium Salts Depend on the Number of Available Ground State Conformations

Ion Ghiviriga ; University of Florida, Chemistry Department, Gainesville, FL 32611-7200, USA
Edmund W. Czerwinski ; University of Texas Medical Branch, Department of Human Biological Chemistry & Genetics, Galveston, TX 77555, USA
Alexandru T. Balaban ; Texas A&M University at Galveston, Galveston, TX 77553-1675, USA

Puni tekst: engleski, pdf (102 KB) str. 391-396 preuzimanja: 193* citiraj
APA 6th Edition
Ghiviriga, I., Czerwinski, E.W. i Balaban, A.T. (2004). Rotation Barriers in Pyridinium Salts Depend on the Number of Available Ground State Conformations. Croatica Chemica Acta, 77 (1-2), 391-396. Preuzeto s https://hrcak.srce.hr/102732
MLA 8th Edition
Ghiviriga, Ion, et al. "Rotation Barriers in Pyridinium Salts Depend on the Number of Available Ground State Conformations." Croatica Chemica Acta, vol. 77, br. 1-2, 2004, str. 391-396. https://hrcak.srce.hr/102732. Citirano 23.06.2018.
Chicago 17th Edition
Ghiviriga, Ion, Edmund W. Czerwinski i Alexandru T. Balaban. "Rotation Barriers in Pyridinium Salts Depend on the Number of Available Ground State Conformations." Croatica Chemica Acta 77, br. 1-2 (2004): 391-396. https://hrcak.srce.hr/102732

Sažetak
The enthalpy and entropy of activation for the rotation about the C–N bond were measured in a series of five N-(1-hydroxybutan-2-yl)pyridinium salts, the 2,6-substituents being methyl, ethyl and isopropyl. Replacement of a methyl by an ethyl does not change the activation parameters, while replacement by an isopropyl increases both the activation enthalpy and the activation entropy. The latter is due to the decreased number of conformations available in the ground state. The activation entropies fit a simple model based on entropy of mixing.

Ključne riječi
pyridinium; conformation; isopropyl; activation parameters

Hrčak ID: 102732

URI
https://hrcak.srce.hr/102732

Posjeta: 305 *