ISSN:
0021-8383
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The chemiluminescent decomposition of functionalized 1,2-dioxetanes was examined in toluene solution. Activation energies were measured by isothermal and nonisothermal kinetic methods. Quantum efficiencies were determined by Stern-Volmer kinetics, using the fluorescers 9,10-dibromo- and 9,10-diphenylanthracene for the triplet and singlet excitation yields. The derivatives of 3-hydroxymethyl-3,4,4-trimethyl-1,2-dioxetane (1a) have free energies of activation (ΔG≠) of ca. 25 kcal/mol, but the ΔG≠ values of the annelated benzofuran-type dioxetanes (5) are ca. 1 kcal/mol lower. There exists a reasonable correlation between the free energies of activation (ΔG≠) for the thermal decomposition of the dioxetanes and their triplet excitation flux (EpT).
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/prac.19903320205
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