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Title: Reduction of 1,2,3-trichloropropane (TCP): pathways and mechanisms from computational chemistry calculations

Abstract

The characteristic pathway for degradation of halogenated aliphatic compounds in groundwater or other environments with relatively anoxic and/or reducing conditions is reductive dechlorination. For 1,2-dihalocarbons, reductive dechlorination can include hydrogenolysis and dehydrohalogenation, the relative significance of which depends on various structural and energetic factors. To better understand how these factors influence the degradation rates and products of the lesser halogenated hydrocarbons (in contrast to the widely studied per-halogenated hydrocarbons, like trichloroethylene and carbon tetrachloride), density functional theory calculations were performed to compare all of the possible pathways for reduction and elimination of 1,2,3-trichloropropane (TCP). The results showed that free energies of each species and reaction step are similar for all levels of theory, although B3LYP differed from the others. In all cases, the reaction coordinate diagrams suggest that β-elimination of TCP to allyl chloride followed by hydrogenolysis to propene is the thermodynamically favored pathway. This result is consistent with experimental results obtained using TCP, 1,2-dichloropropane, and 1,3-dichloropropane in batch experiments with zerovalent zinc (Zn0, ZVI) as a reductant.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1];  [1]; ORCiD logo [1]
  1. OHSU-PSU School of Public Health; Oregon Health & Science University; Portland; USA
  2. William R. Wiley Environmental Molecular Sciences Laboratory; Pacific Northwest National Laboratory; Richland; USA
  3. Jacobs; Portland; USA
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1595844
Alternate Identifier(s):
OSTI ID: 1616695
Report Number(s):
PNNL-SA-149824
Journal ID: ISSN 2050-7887; ESPICZ
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Published Article
Journal Name:
Environmental Science: Processes & Impacts
Additional Journal Information:
Journal Name: Environmental Science: Processes & Impacts Journal Volume: 22 Journal Issue: 3; Journal ID: ISSN 2050-7887
Publisher:
Royal Society of Chemistry
Country of Publication:
United Kingdom
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Torralba-Sanchez, Tifany L., Bylaska, Eric J., Salter-Blanc, Alexandra J., Meisenheimer, Douglas E., Lyon, Molly A., and Tratnyek, Paul G. Reduction of 1,2,3-trichloropropane (TCP): pathways and mechanisms from computational chemistry calculations. United Kingdom: N. p., 2020. Web. doi:10.1039/C9EM00557A.
Torralba-Sanchez, Tifany L., Bylaska, Eric J., Salter-Blanc, Alexandra J., Meisenheimer, Douglas E., Lyon, Molly A., & Tratnyek, Paul G. Reduction of 1,2,3-trichloropropane (TCP): pathways and mechanisms from computational chemistry calculations. United Kingdom. https://doi.org/10.1039/C9EM00557A
Torralba-Sanchez, Tifany L., Bylaska, Eric J., Salter-Blanc, Alexandra J., Meisenheimer, Douglas E., Lyon, Molly A., and Tratnyek, Paul G. Wed . "Reduction of 1,2,3-trichloropropane (TCP): pathways and mechanisms from computational chemistry calculations". United Kingdom. https://doi.org/10.1039/C9EM00557A.
@article{osti_1595844,
title = {Reduction of 1,2,3-trichloropropane (TCP): pathways and mechanisms from computational chemistry calculations},
author = {Torralba-Sanchez, Tifany L. and Bylaska, Eric J. and Salter-Blanc, Alexandra J. and Meisenheimer, Douglas E. and Lyon, Molly A. and Tratnyek, Paul G.},
abstractNote = {The characteristic pathway for degradation of halogenated aliphatic compounds in groundwater or other environments with relatively anoxic and/or reducing conditions is reductive dechlorination. For 1,2-dihalocarbons, reductive dechlorination can include hydrogenolysis and dehydrohalogenation, the relative significance of which depends on various structural and energetic factors. To better understand how these factors influence the degradation rates and products of the lesser halogenated hydrocarbons (in contrast to the widely studied per-halogenated hydrocarbons, like trichloroethylene and carbon tetrachloride), density functional theory calculations were performed to compare all of the possible pathways for reduction and elimination of 1,2,3-trichloropropane (TCP). The results showed that free energies of each species and reaction step are similar for all levels of theory, although B3LYP differed from the others. In all cases, the reaction coordinate diagrams suggest that β-elimination of TCP to allyl chloride followed by hydrogenolysis to propene is the thermodynamically favored pathway. This result is consistent with experimental results obtained using TCP, 1,2-dichloropropane, and 1,3-dichloropropane in batch experiments with zerovalent zinc (Zn0, ZVI) as a reductant.},
doi = {10.1039/C9EM00557A},
journal = {Environmental Science: Processes & Impacts},
number = 3,
volume = 22,
place = {United Kingdom},
year = {Wed Jan 01 00:00:00 EST 2020},
month = {Wed Jan 01 00:00:00 EST 2020}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1039/C9EM00557A

Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

Figures / Tables:

Fig. 1 Fig. 1: Summary of the main pathways of alkyl halide transformation under reducing conditions. Nu represents the nucleophiles from water or sulfide, X represents any halide including chlorine, e- represents electrons from any reductant, and R represents any alkyl substituent including -CClH3 for TCP. The abbreviations represent common pathway namesmore » for each pathway. NuS: nucleophilic substitution, HGL: hydrogenolysis, BRE: reductive β-elimination, DHX: dehydrohalogenation, and HDG: hydrogenation.« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.