Dramatic Conformer-Dependent Reactivity of the Acetaldehyde Oxide Criegee Intermediate with Dimethylamine Via a 1,2-Insertion Mechanism
- Argonne National Lab. (ANL), Lemont, IL (United States)
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Northwestern Univ., Evanston, IL (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sandia National Lab. (SNL-CA), Livermore, CA (United States); Univ. of Georgia, Athens, GA (United States)
- Sandia National Lab. (SNL-CA), Livermore, CA (United States); Univ. of California, Davis, CA (United States)
- California Institute of Technology (CalTech), Pasadena, CA (United States)
- Argonne National Lab. (ANL), Lemont, IL (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
The reactivity of carbonyl oxides has previously been shown to exhibit strong conformer and substituent dependencies. Through a combination of synchrotron multiplexed photoionization mass spectrometry experiments (298 K, 4 Torr) and high-level theory (CCSD(T)-F12/cc-pVTZ-F12//B2PLYP-D3/cc-pVTZ with an added CCSDT(Q) correction), we explore the conformer dependence of the reaction of acetaldehyde oxide (CH3CHOO) with dimethyl amine (DMA). The experimental data supports the theoretically predicted 1,2-insertion mechanism and the formation of an amine-functionalized hydroperoxide reaction product. Tunable-VUV photoionization probing of anti- or anti- + syn-CH3CHOO reveals a strong conformer dependence of the title reaction. Here, the rate coefficient of DMA with anti-CH3CHOO is predicted to exceed that for the reaction with syn-CH3CHOO by a factor of ~34,000, which is attributed to submerged barrier (syn) vs. barrierless (anti) mechanisms for energetically downhill reactions.
- Research Organization:
- Univ. of Pennsylvania, Philadelphia, PA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
- Grant/Contract Number:
- FG02-87ER13792; AC02-06CH11357; AC02-05CH11231; NA0003525
- OSTI ID:
- 1865338
- Alternate ID(s):
- OSTI ID: 1887413
- Report Number(s):
- SAND2022-11977J; TRN: US2305855
- Journal Information:
- Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory, Vol. 126, Issue 5; ISSN 1089-5639
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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