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Watumlawar EC, Park BD. A Novel Method of Self-Cross-Linking of Syringaldehyde with Activated Methoxy Groups via Cross-Coupling for Lignin-Based Wood Adhesives. ACS OMEGA 2024; 9:28167-28175. [PMID: 38973923 PMCID: PMC11223239 DOI: 10.1021/acsomega.4c01267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 06/02/2024] [Accepted: 06/11/2024] [Indexed: 07/09/2024]
Abstract
As steric hindrance, methoxy groups are limiting the valorization of hardwood lignin. This paper reports a novel method of self-cross-linking of the syringaldehyde with activated methoxy groups (-OCH3) via cross-coupling reaction to obtain thermosetting polymers for lignin-based wood adhesives. The methoxy groups of syringaldehyde have been activated via cross-coupling reaction by substituting Ar-OCH3 with Ar-CH2-SiMe3, and dichloromethane, leading to cross-linking via methylene bridges to build a thermosetting polymer. FTIR spectra showed a decrease in the intensity of a -CH3 and -OH group, owing to the substitution of the methoxy group. 13C NMR spectra also supported these results with the -SiMe3 signal that disappeared after the cross-linking reaction. Furthermore, cross-linking between the activated methoxy groups was confirmed with a strong exothermic peak at 130 °C, resulting in an increase in the adhesion strength as hot-pressing temperature increased from 160 to 180 °C. These results suggest that the cross-linking between the activated methoxy groups of syringaldehyde is an important understanding of valorizing hardwood lignin via building thermosetting polymers for lignin-based adhesives.
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Affiliation(s)
- Ega Cyntia Watumlawar
- Department of Wood and Paper
Science, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Byung-Dae Park
- Department of Wood and Paper
Science, Kyungpook National University, Daegu 41566, Republic of Korea
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Nallappan S, Lapinskaite R, Hájíček J, Kunák D, Čambal P, Nečas D, Císařová I, Atalay HN, Tumer TB, Tarábek J, Schwarzová-Pecková K, Rycek L. The Biomimetic Synthesis of Polyarylated Fluorenes, Relevant to Selaginellaceae Polyphenols, Leading to the Spontaneous Formation of Stable Radicals. Chempluschem 2024; 89:e202300410. [PMID: 37943550 DOI: 10.1002/cplu.202300410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 10/31/2023] [Accepted: 11/08/2023] [Indexed: 11/10/2023]
Abstract
This work reports a biomimetic synthesis of polyarylated fluorene derivatives. The molecules are formed via intramolecular electrophilic aromatic substitution, resembling a cyclization leading towards the natural selaginpulvilins from selaginellins. The scope of the reaction was investigated, and the products were obtained in 60-95 % yields. Some of the compounds decompose to a stable radical. We investigated the nature and the origin of the radical using experimental methods, including EPR or electrochemical measurements, as well as theoretical methods, such as DFT calculations. Based on our observations, we hypothesize, that phenoxy radicals are formed in the first instance, which however undergo internal rearrangement to thermodynamically more stable carbon-centered radicals. The preliminary data also show the cytotoxic properties of some of the molecules.
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Affiliation(s)
- Sundaravelu Nallappan
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
| | - Ringaile Lapinskaite
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
- Department of Organic Chemistry, Center for Physical Sciences and Technology, Akademijos g. 7, Vilnius, 08412, Lithuania
| | - Josef Hájíček
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
| | - Dominik Kunák
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
| | - Peter Čambal
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
| | - David Nečas
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
| | - Hazal Nazlıcan Atalay
- Department of Molecular Biology and Genetics, Faculty of Arts and Science, Canakkale Onsekiz Mart University, Canakkale, 17020, Turkey
| | - Tugba B Tumer
- Department of Molecular Biology and Genetics, Faculty of Arts and Science, Canakkale Onsekiz Mart University, Canakkale, 17020, Turkey
| | - Ján Tarábek
- Institute of Organic Chemistry and Biochemistry, Academy of Science of the Czech Republic, Flemingovo nám. 2, 166 10, Prague, Czech Republic
| | - Karolina Schwarzová-Pecková
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
| | - Lukas Rycek
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
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Lapinskaite R, Atalay HN, Malatinec Š, Donmez S, Cinar ZO, Schwarz PF, Perhal AF, Císařová I, Labanauskas L, Karpiński TM, Dirsch VM, Tumer TB, Rycek L. Synthesis of Selagibenzophenone A and Its Derivatives for Evaluation of Their Antiproliferative, RORγ Inverse Agonistic, and Antimicrobial Effect**. ChemistrySelect 2023. [DOI: 10.1002/slct.202204816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Affiliation(s)
- Ringaile Lapinskaite
- Department of Organic Chemistry Faculty of Science Charles University Hlavova 8 128 00 Praha 2 Czech Republic
- Department of Organic Chemistry Center for Physical Sciences and Technology Akademijos g. 7 Vilnius 08412 Lithuania
| | - Hazal Nazlıcan Atalay
- Graduate Program of Molecular Biology and Genetics School of Graduate Studies Canakkale Onsekiz Mart University Canakkale 17020 Turkey
| | - Štefan Malatinec
- Department of Organic Chemistry Faculty of Science Charles University Hlavova 8 128 00 Praha 2 Czech Republic
| | - Serhat Donmez
- Graduate Program of Molecular Biology and Genetics School of Graduate Studies Canakkale Onsekiz Mart University Canakkale 17020 Turkey
| | - Zeynep Ozlem Cinar
- Graduate Program of Molecular Biology and Genetics School of Graduate Studies Canakkale Onsekiz Mart University Canakkale 17020 Turkey
| | - Patrik F. Schwarz
- Department of Pharmaceutical Sciences University of Vienna Josef-Holaubek-Platz 2 1090 Vienna Austria
| | - Alexander F. Perhal
- Department of Pharmaceutical Sciences University of Vienna Josef-Holaubek-Platz 2 1090 Vienna Austria
| | - Ivana Císařová
- Department of Inorganic Chemistry Faculty of Science Charles University Hlavova 8 128 00 Praha 2 Czech Republic
| | - Linas Labanauskas
- Department of Organic Chemistry Center for Physical Sciences and Technology Akademijos g. 7 Vilnius 08412 Lithuania
| | - Tomasz M. Karpiński
- Chair and Department of Medical Microbiology Poznań University of Medical Sciences Wieniawskiego 3 61-712 Poznań Poland
| | - Verena M. Dirsch
- Department of Pharmaceutical Sciences University of Vienna Josef-Holaubek-Platz 2 1090 Vienna Austria
| | - Tugba Boyunegmez Tumer
- Department of Molecular Biology and Genetics Faculty of Arts and Science Canakkale Onsekiz Mart University Canakkale 17020 Turkey
| | - Lukas Rycek
- Department of Organic Chemistry Faculty of Science Charles University Hlavova 8 128 00 Praha 2 Czech Republic
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10th Anniversary of Catalysts: Molecular Catalysis. Catalysts 2022. [DOI: 10.3390/catal12121584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
On the occasion of this Special Issue, I would like to present an editorial message on this good occasion [...]
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Kunák D, Mateus M, Rycek L. Synthesis and Structure Confirmation of Selagibenzophenone C. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Dominik Kunák
- Charles University Faculty of Science: Univerzita Karlova Prirodovedecka fakulta Department of Organic Chemistry CZECH REPUBLIC
| | - Miguel Mateus
- Charles University Faculty of Science: Univerzita Karlova Prirodovedecka fakulta Department of Organic Chemistry CZECH REPUBLIC
| | - Lukas Rycek
- Charles University Faculty of Science: Univerzita Karlova Prirodovedecka fakulta Departmet of Organic Chemistry Hlavova 8 128 40 Prague CZECH REPUBLIC
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