Kinetic and Mechanistic Insights into H-Abstraction and Subsequent Isomerization and Decomposition of Monoglyme and Key Combustion Intermediates

CHO). The H-abstraction of methoxy acetaldehyde by the four radicals mentioned above and the subsequent reactions were further investigated using the same methodology. The results indicate that the reactivity sequence of H-abstraction in methoxy acetaldehyde is consistent with that of MON. The methoxy acetaldehyde-derived radicals preferentially evolve through lower-barrier decomposition pathways rather than extensive isomerization. Comparisons with related ether systems and uncertainty analyses support the reliability of the calculated rate constants within the expected theoretical uncertainty. Implementation of the updated H-abstraction kinetics into a detailed MON oxidation mechanism affects the predicted ignition delay times. These results characterize the H-abstraction and subsequent unimolecular-reaction subnetwork from MON to methoxy acetaldehyde and smaller products, providing mechanism kinetic data for future refinement of oxygenated polyether combustion models.