Theoretical Studies for Ozonide Formation During the Ozonolysis of Bicyclic Endoperoxides
Nicole M. Cain A B , Josh L. Hixson A and Dennis K. Taylor A CA School of Agriculture, Food and Wine, The University of Adelaide, Adelaide, SA 5064, Australia.
B Current address: Department of Environment and Primary Industries (DEPI), Ernest Jones Drive, Macleod, Vic. 3085, Australia.
C Corresponding author. Email: dennis.taylor@adelaide.edu.au
Australian Journal of Chemistry 66(8) 891-898 https://doi.org/10.1071/CH13277
Submitted: 31 May 2013 Accepted: 16 July 2013 Published: 6 August 2013
Abstract
Theoretical investigations on the treatment of bicyclic endoperoxides (1,2-dioxines) with ozone at the HF/6–31G*, MP2/6–31G* or 6–311G*, and DFT(B3LYP)/6–31G* levels of theory indicate that the estimated activation energies for formation of the possible endo-endo, endo-exo, exo-endo, or exo-exo transition states along with the formation of the primary ozonides and product ozonides are very sensitive to effects of electron correlation and basis set. This study suggests that MP2/6–311G* is the best level of theory for evaluating such systems. At the MP2/6–311G* level of theory it was found that the transition state for primary ozonide formation was lowest in energy when ozone approaches in an endo facial fashion with a further 3 kJ mol–1 stabilisation seen when the central oxygen within the primary ozonide protrudes outwards (exo) as opposed to inwards (endo). The product ozonides are predicted to be more stable than the combined starting materials by some 380–580 kJ mol–1 depending on the level of theory, clearly highlighting the substantive exothermic nature of this type of ozonolysis reaction.
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