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Zhu X, Jian C, Zhou X, Asiri AM, Alamry KA, Wu P, Huang Z. Theoretical Computations on the Pyrolysis of Alkyl (dithio)acetates. LETT ORG CHEM 2020. [DOI: 10.2174/1570178616666190717123039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The pyrolysis of methyl alkyl esters I to III and dithioesters IV to VI were theoretically calculated.
All possible pyrolysis paths were considered. Both esters and dithioesters presented three potential
paths via six-, four- and five-membered ring transition states, respectively. The calculation processes
were calculated using MP2/6-31G(d) set. In-depth theoretical analyses were also presented, including
NBO related analyses, synchronicities, and charge distributions, to reveal the detailed pyrolysis
process.
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Affiliation(s)
- Xun Zhu
- Department of Pharmacy, Yancheng Polytechnic College, Yancheng, Jiangsu 224005, China
| | - Chen Jian
- Department of Pharmacy, Yancheng Polytechnic College, Yancheng, Jiangsu 224005, China
| | - Xiuqin Zhou
- Department of Pharmacy, Yancheng Polytechnic College, Yancheng, Jiangsu 224005, China
| | - Abdullah M. Asiri
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Khalid A. Alamry
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Ping Wu
- Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong, Dezhou College, Dezhou, Shandong, 253023, China
| | - Zhihao Huang
- Department of Chemistry, School of Science, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States
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Xia J, Asiri AM, Alamry KA, Wu P, Huang Z. Pyrolysis of (thio)carbonates via computation analysis. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2018. [DOI: 10.1142/s0219633618500414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The regioselective production of alkenes from (thio)carbonates was calculated by MP2/6-31G(d) method via pyrolysis processes. Four (thio)carbonates were calculated in this paper. They are S-sec-butyl O-methyl thiocarbonate (I), O-sec-butyl S-methyl thiocarbonate (II), sec-butyl methyl thioncarbonate (III), and sec-butyl methyl dithiocarbonate (IV). Thirteen potential thermolysis routes were revealed for the pyrolysis of each substance, including nine routes to produce regioselective alkenes and four rearrangement/decompose alternatives. Among nine alkene generation routes, six-membered ring transition states via a two-step mechanism required the lowest energy, while the other routes exhibited higher energy barriers. The calculation results demonstrated an alkene distribution hierarchy of 1-butene [Formula: see text] E-butene [Formula: see text] Z-butene for substances I and II, and an order of E-butene [Formula: see text] 1-butene [Formula: see text] Z-butene for substances III and IV.
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Affiliation(s)
- Jingjing Xia
- Key Laboratory of Functional Molecule Design and Interface Process, Anhui Jianzhu University, Hefei, Anhui 230601, P. R. China
| | - Abdullah M. Asiri
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Khalid A. Alamry
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Ping Wu
- Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong, Dezhou College, Dezhou, Shandong 253023, P. R. China
| | - Zhihao Huang
- Department of Chemistry, School of Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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Zhu X, Zhou X, Xiang D, Wu P. A theoretical study towards thermolysis process of thionesters and thiolesters. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2018. [DOI: 10.1142/s0219633618500141] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This paper focuses on the thermal elimination of alkenes from methyl alkyl thionacetates and thiolacetates. Three alkyl groups are calculated: ethyl, isopropyl and tert-butyl. Possible elimination mechanisms are considered, including six- and four-membered ring transition states for alkene elimination, four-membered ring isomerization and a possible five-membered ring decomposition. Theoretical calculations are performed with the MP2 method and the 6-31G* basis set. Wiberg bond indices are also summarized to monitor the reaction progress.
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Affiliation(s)
- Xun Zhu
- Department of Chemical Engineering, Yancheng Vocational Institute of Industry Technology, Yancheng, Jiangsu 224005, P. R. China
| | - Xiuqin Zhou
- Department of Chemical Engineering, Yancheng Vocational Institute of Industry Technology, Yancheng, Jiangsu 224005, P. R. China
| | - Dongsheng Xiang
- Department of Chemical Engineering, Yancheng Vocational Institute of Industry Technology, Yancheng, Jiangsu 224005, P. R. China
| | - Ping Wu
- Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong, Dezhou College, Dezhou, Shandong 253023, P. R. China
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Xia J, Wu P. A computational study on the thermal decomposition of di(tri)thiocarbonates. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2016. [DOI: 10.1142/s0219633616500619] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Alkyl methyl di(tri)thiocarbonates can be thermally decomposed into alkenes. In this paper, theoretical calculations were used to calculate the thermal decomposition procedures. Six compounds, including ethyl, isopropyl and [Formula: see text] dithiocarbonate and trithiocarbonate, were examined. For each decomposition, nine possible paths were considered, including the paths leading to the desired alkene products, as well as rearrangement and elimination reactions. This calculation was performed with the MP2/6-31G(d) method. Wiberg bond indices were also calculated to further reveal the reaction progress.
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Affiliation(s)
- Jingjing Xia
- Key Laboratory of Functional Molecule Design and Interface Process, Anhui Jianzhu University, Heifei, Anhui 230601, P. R. China
| | - Ping Wu
- Key Laboratory of Coordination Chemistry and Functional, Materials in Universities of Shandong, Dezhou College, Dezhou, Shandong 253023, P. R. China
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Wu P. Theoretical study of the mechanism generating azomethine ylide from formaldehyde and glycine. J STRUCT CHEM+ 2016. [DOI: 10.1134/s0022476615070057] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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