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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

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Revisiting the Nonadiabatic Process in 1,2-Dioxetane.

Pooria Farahani¹, Daniel Roca-Sanjuán², Felipe Zapata³

¹Department of Chemistry, Ångström, Uppsala University , P.O. Box 518, SE-751 20 Uppsala, Sweden.

Journal of Chemical Theory and Computation

|November 24, 2015

Summary

Understanding 1,2-dioxetane decomposition is key for chemiluminescence. New calculations reveal complex mechanisms, explaining high triplet product ratios in dissociation.

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Area of Science:

Physical Chemistry
Chemical Physics

Background:

Chemiluminescence and bioluminescence rely on 1,2-dioxetane decomposition mechanisms.
Previous studies lacked a complete understanding due to complex non-adiabatic processes.

Purpose of the Study:

To elucidate the ground and excited-state decomposition mechanisms of 1,2-dioxetane.
To extend previous work by providing further mechanistic details and rationalizing experimental observations.

Main Methods:

High-level multistate multi-configurational reference second-order perturbation theory calculations.
Ab initio molecular dynamics simulations at constant temperature.

Main Results:

Detailed insights into the complex non-adiabatic decomposition pathways of 1,2-dioxetane.
Explanation for the observed high ratio of triplet to singlet dissociation products.
Confirmation and extension of a previously proposed two-step dissociation mechanism.

Conclusions:

The study provides a more comprehensive understanding of 1,2-dioxetane decomposition.
The findings reconcile theoretical calculations with experimental observations in chemiluminescence.
This work advances the fundamental knowledge of energy release in chemical reactions.