000838697 001__ 838697 000838697 005__ 20240712101020.0 000838697 0247_ $$2doi$$a10.1039/C7CP05132H 000838697 0247_ $$2ISSN$$a1463-9076 000838697 0247_ $$2ISSN$$a1463-9084 000838697 0247_ $$2pmid$$apmid:29057418 000838697 0247_ $$2WOS$$aWOS:000414243300016 000838697 037__ $$aFZJ-2017-07258 000838697 082__ $$a540 000838697 1001_ $$0P:(DE-Juel1)167140$$aVereecken, Luc$$b0$$eCorresponding author 000838697 245__ $$aThe reaction of Criegee intermediates with acids and enols 000838697 260__ $$aCambridge$$bRSC Publ.$$c2017 000838697 3367_ $$2DRIVER$$aarticle 000838697 3367_ $$2DataCite$$aOutput Types/Journal article 000838697 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1509623082_7894 000838697 3367_ $$2BibTeX$$aARTICLE 000838697 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000838697 3367_ $$00$$2EndNote$$aJournal Article 000838697 520__ $$aThe reaction of CH2OO, the smallest carbonyl oxide (Criegee intermediate, CI), with several acids was investigated using the CCSD(T)/aug-cc-pVTZ//M06-2X/aug-cc-pVTZ quantum chemical method, as well as microvariational transition state theory and RRKM master equation theoretical kinetic methodologies. For oxoacids HNO3 and HCOOH, a 1,4-insertion mechanism allows for barrierless reactions with high rate coefficients, in agreement with literature experimental data. This mechanism relies on the presence of a double bond in the α-position to the acidic OH group. We predict that reactions of CI with enols will likewise have high rate coefficients, proceeding through a similar mechanism. The hydracid HCl was found to react through a less favorable 1,2-insertion reaction, leading to lower rate coefficients, again in good agreement with the literature. We conclude that the reaction mechanism is the main indicator for the reaction rate for CH2OO + acid reactions, with acidity only of secondary influence. At room temperature and 1 atm the main product for all reactions was found to be the thermalized hydroperoxide initial adduct, with minor yields of fragmentation products. 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