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Liu L, Mendoza-Espinosa D, Quiroz-Guzmán M, Rheingold AL, Hanna TA, Saha G, Tang L, Chen Y, Gilbert M, Dutta A, Asandei AD. Radical and Ring-Opening Polymerizations with Aryl-Substituted Methylene-Bridged Titanium Bisphenolates. Organometallics 2023. [DOI: 10.1021/acs.organomet.3c00053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
Affiliation(s)
- Lihua Liu
- Department of Chemistry, Texas Christian University, Box 298860, Fort Worth, Texas 76129, United States
| | - Daniel Mendoza-Espinosa
- Department of Chemistry, Texas Christian University, Box 298860, Fort Worth, Texas 76129, United States
| | - Mauricio Quiroz-Guzmán
- Department of Chemistry, Texas Christian University, Box 298860, Fort Worth, Texas 76129, United States
| | - Arnold L. Rheingold
- Department of Chemistry, UC San Diego, 9500 Gilman Drive, La Jolla, California 92093-0021, United States
| | - Tracy A. Hanna
- Department of Chemistry, Texas Christian University, Box 298860, Fort Worth, Texas 76129, United States
| | - Gobinda Saha
- Institute of Materials Science, Polymer Program and Department of Chemistry, University of Connecticut, Storrs, Connecticut 06062-3136, United States
| | - Liming Tang
- Institute of Materials Science, Polymer Program and Department of Chemistry, University of Connecticut, Storrs, Connecticut 06062-3136, United States
| | - Yanhui Chen
- Institute of Materials Science, Polymer Program and Department of Chemistry, University of Connecticut, Storrs, Connecticut 06062-3136, United States
| | - Megan Gilbert
- Institute of Materials Science, Polymer Program and Department of Chemistry, University of Connecticut, Storrs, Connecticut 06062-3136, United States
| | - Abhirup Dutta
- Institute of Materials Science, Polymer Program and Department of Chemistry, University of Connecticut, Storrs, Connecticut 06062-3136, United States
| | - Alexandru D. Asandei
- Institute of Materials Science, Polymer Program and Department of Chemistry, University of Connecticut, Storrs, Connecticut 06062-3136, United States
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Kinetics and thermodynamics studies of the ring-opening polymerization of ε-caprolactone initiated by titanium(IV) alkoxides by isothermal differential scanning calorimetry. REACTION KINETICS MECHANISMS AND CATALYSIS 2022. [DOI: 10.1007/s11144-022-02184-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Clark JA, Thacker PJ, McGill CJ, Miles JR, Westmoreland PR, Efimenko K, Genzer J, Santiso EE. DFT Analysis of Organotin Catalytic Mechanisms in Dehydration Esterification Reactions for Terephthalic Acid and 2,2,4,4-Tetramethyl-1,3-cyclobutanediol. J Phys Chem A 2021; 125:4943-4956. [PMID: 34101445 DOI: 10.1021/acs.jpca.1c00850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Polyesters synthesized from 2,2,4,4-tetramethyl-1,3-cyclobutanediol (TMCD) and terephthalic acid (TPA) are improved alternatives to toxic polycarbonates based on bisphenol A. In this work, we use ωB97X-D/LANL2DZdp calculations, in the presence of a benzaldehyde polarizable continuum model solvent, to show that esterification of TMCD and TPA will reduce and subsequently dehydrate a dimethyl tin oxide catalyst, becoming ligands on the now four-coordinate complex. This reaction then proceeds most plausibly by an intramolecular acyl-transfer mechanism from the tin complex, aided by a coordinated proton donor such as hydronium. These findings are a key first step in understanding polyester synthesis and avoiding undesirable side reactions during production.
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Affiliation(s)
- Jennifer A Clark
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Pranav J Thacker
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Charles J McGill
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Jason R Miles
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Phillip R Westmoreland
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Kirill Efimenko
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Jan Genzer
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Erik E Santiso
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
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Kayan A. Recent Studies on Single Site Metal Alkoxide Complexes as Catalysts for Ring Opening Polymerization of Cyclic Compounds. CATALYSIS SURVEYS FROM ASIA 2020. [DOI: 10.1007/s10563-019-09291-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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Nifant’ev I, Ivchenko P. Coordination Ring-Opening Polymerization of Cyclic Esters: A Critical Overview of DFT Modeling and Visualization of the Reaction Mechanisms. Molecules 2019; 24:E4117. [PMID: 31739538 PMCID: PMC6891794 DOI: 10.3390/molecules24224117] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 11/09/2019] [Accepted: 11/12/2019] [Indexed: 01/29/2023] Open
Abstract
Ring-opening polymerization (ROP) of cyclic esters (lactones, lactides, cyclic carbonates and phosphates) is an effective tool to synthesize biocompatible and biodegradable polymers. Metal complexes effectively catalyze ROP, a remarkable diversity of the ROP mechanisms prompted the use of density functional theory (DFT) methods for simulation and visualization of the ROP pathways. Optimization of the molecular structures of the key reaction intermediates and transition states has allowed to explain the values of catalytic activities and stereocontrol events. DFT computation data sets might be viewed as a sound basis for the design of novel ROP catalysts and cyclic substrates, for the creation of new types of homo- and copolymers with promising properties. In this review, we summarized the results of DFT modeling of coordination ROP of cyclic esters. The importance to understand the difference between initiation and propagation stages, to consider the possibility of polymer-catalyst coordination, to figure out the key transition states, and other aspects of DFT simulation and visualization of ROP have been also discussed in our review.
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Affiliation(s)
- Ilya Nifant’ev
- Chemistry Department, M.V. Lomonosov Moscow State University, 1 Leninskie Gory Str., Building 3, 119991 Moscow, Russia
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, 29 Leninsky Pr., 119991 Moscow, Russia
| | - Pavel Ivchenko
- Chemistry Department, M.V. Lomonosov Moscow State University, 1 Leninskie Gory Str., Building 3, 119991 Moscow, Russia
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, 29 Leninsky Pr., 119991 Moscow, Russia
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Scandelai APJ, Sloboda Rigobello E, Oliveira BLCD, Tavares CRG. Identification of organic compounds in landfill leachate treated by advanced oxidation processes. ENVIRONMENTAL TECHNOLOGY 2019; 40:730-741. [PMID: 29160760 DOI: 10.1080/09593330.2017.1405079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 11/09/2017] [Indexed: 06/07/2023]
Abstract
Landfill leachates are considered to be complex effluents of a variable composition containing many biorecalcitrant and highly toxic compounds. Considering the shortage of studies concerning the treatment of landfill leachates using ozone, as well as its combination with catalysts, the aim of this paper was to identify the organic compounds in this effluent treated with advanced oxidation processes (AOPs) of ozonation (O3), and heterogeneous catalytic ozonation with TiO2 (O3/TiO2) and with ZnO (O3/ZnO). In addition, this study sought to assess the efficiency of the removal of the organic matter present in the leachate. For the pre- and post-AOPs, the leachate was characterized through physicochemical parameters and identification of organic compounds using gas chromatography coupled to the mass spectrometry (GC-MS). The three processes studied (O3, O3/TiO2, and O3/ZnO) presented color removal, turbidity, BOD above 95%, and lower COD removals (19%, 24%, and 33%, respectively). All AOPs studied promoted a similar reduction of organic compounds from leachate, some of which with toxic and carcinogenic potential, such as p-cresol, bisphenol A, atrazine, and hexazinone. In addition, upon the removal of organic matter and organic compounds, the heterogeneous catalytic ozonation processes proved more efficient than the process carried out only with ozone.
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Affiliation(s)
| | - Eliane Sloboda Rigobello
- a Department of Chemical Engineering , Universidade Estadual de Maringá , Maringá , Paraná , Brazil
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