Formation rate of benzyl cations in various aqueous solutions containing different concentrations of acid but with a specific proton activity in lignin acidolysis
Abstract This study aimed to clarify the effect of different solvents, aqueous 1,4-dioxane, ethanol, or ethylene glycol at various mol%, on the formation rate of the benzyl cation, which forms via two steps, the protonation of the benzyl hydroxy or alkoxy group as a pre-equilibrium step and subseque...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Ito, Hiroaki [verfasserIn] |
|---|
| Format: |
Artikel |
|---|---|
| Sprache: |
Englisch |
| Erschienen: |
2022 |
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| Anmerkung: |
© 2022 Walter de Gruyter GmbH, Berlin/Boston |
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| Übergeordnetes Werk: |
Enthalten in: Holzforschung - De Gruyter, 1947, 76(2022), 8 vom: 24. Mai, Seite 722-731 |
|---|---|
| Übergeordnetes Werk: |
volume:76 ; year:2022 ; number:8 ; day:24 ; month:05 ; pages:722-731 |
| Links: |
|---|
| DOI / URN: |
10.1515/hf-2022-0053 |
|---|
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OLC2143102402 |
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| 520 | |a Abstract This study aimed to clarify the effect of different solvents, aqueous 1,4-dioxane, ethanol, or ethylene glycol at various mol%, on the formation rate of the benzyl cation, which forms via two steps, the protonation of the benzyl hydroxy or alkoxy group as a pre-equilibrium step and subsequent liberation of the water or corresponding alcohol molecule, respectively, in a model system of the lignin acidolysis, focusing on distinguishing the effects on both steps. For this aim, the acidolysis reactions were conducted in various aqueous solutions and organic solvents that showed a specific proton activity to establish the pre-equilibrium at a specific position. The formation rate of the benzyl cation showed minima in the intermediate mol% range. However, these rate differences were much smaller than those observed in the previous report where the aqueous solutions were prepared to contain a specific acid concentration and show different proton activities and thus the net effect of the solvent type on both steps was indistinguishable. These results clearly showed that the solvent type affects the first step (the proton activity) much more than the last step (the solvent-dissociating power). This paper also describes the preparation of the aqueous solutions to demonstrate a specific proton activity. | ||
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10.1515/hf-2022-0053 doi (DE-627)OLC2143102402 (DE-B1597)hf-2022-0053-p DE-627 ger DE-627 rakwb eng 620 VZ 670 VZ 23 ssgn Ito, Hiroaki verfasserin aut Formation rate of benzyl cations in various aqueous solutions containing different concentrations of acid but with a specific proton activity in lignin acidolysis 2022 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © 2022 Walter de Gruyter GmbH, Berlin/Boston Abstract This study aimed to clarify the effect of different solvents, aqueous 1,4-dioxane, ethanol, or ethylene glycol at various mol%, on the formation rate of the benzyl cation, which forms via two steps, the protonation of the benzyl hydroxy or alkoxy group as a pre-equilibrium step and subsequent liberation of the water or corresponding alcohol molecule, respectively, in a model system of the lignin acidolysis, focusing on distinguishing the effects on both steps. For this aim, the acidolysis reactions were conducted in various aqueous solutions and organic solvents that showed a specific proton activity to establish the pre-equilibrium at a specific position. The formation rate of the benzyl cation showed minima in the intermediate mol% range. However, these rate differences were much smaller than those observed in the previous report where the aqueous solutions were prepared to contain a specific acid concentration and show different proton activities and thus the net effect of the solvent type on both steps was indistinguishable. These results clearly showed that the solvent type affects the first step (the proton activity) much more than the last step (the solvent-dissociating power). This paper also describes the preparation of the aqueous solutions to demonstrate a specific proton activity. Yokoyama, Tomoya aut Enthalten in Holzforschung De Gruyter, 1947 76(2022), 8 vom: 24. Mai, Seite 722-731 (DE-627)129594938 (DE-600)240587-8 (DE-576)015087832 0018-3830 nnns volume:76 year:2022 number:8 day:24 month:05 pages:722-731 https://doi.org/10.1515/hf-2022-0053 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-FOR SSG-OPC-FOR GBV_ILN_40 GBV_ILN_70 GBV_ILN_252 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2542 GBV_ILN_4277 GBV_ILN_4330 AR 76 2022 8 24 05 722-731 |
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10.1515/hf-2022-0053 doi (DE-627)OLC2143102402 (DE-B1597)hf-2022-0053-p DE-627 ger DE-627 rakwb eng 620 VZ 670 VZ 23 ssgn Ito, Hiroaki verfasserin aut Formation rate of benzyl cations in various aqueous solutions containing different concentrations of acid but with a specific proton activity in lignin acidolysis 2022 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © 2022 Walter de Gruyter GmbH, Berlin/Boston Abstract This study aimed to clarify the effect of different solvents, aqueous 1,4-dioxane, ethanol, or ethylene glycol at various mol%, on the formation rate of the benzyl cation, which forms via two steps, the protonation of the benzyl hydroxy or alkoxy group as a pre-equilibrium step and subsequent liberation of the water or corresponding alcohol molecule, respectively, in a model system of the lignin acidolysis, focusing on distinguishing the effects on both steps. For this aim, the acidolysis reactions were conducted in various aqueous solutions and organic solvents that showed a specific proton activity to establish the pre-equilibrium at a specific position. The formation rate of the benzyl cation showed minima in the intermediate mol% range. However, these rate differences were much smaller than those observed in the previous report where the aqueous solutions were prepared to contain a specific acid concentration and show different proton activities and thus the net effect of the solvent type on both steps was indistinguishable. These results clearly showed that the solvent type affects the first step (the proton activity) much more than the last step (the solvent-dissociating power). This paper also describes the preparation of the aqueous solutions to demonstrate a specific proton activity. Yokoyama, Tomoya aut Enthalten in Holzforschung De Gruyter, 1947 76(2022), 8 vom: 24. Mai, Seite 722-731 (DE-627)129594938 (DE-600)240587-8 (DE-576)015087832 0018-3830 nnns volume:76 year:2022 number:8 day:24 month:05 pages:722-731 https://doi.org/10.1515/hf-2022-0053 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-FOR SSG-OPC-FOR GBV_ILN_40 GBV_ILN_70 GBV_ILN_252 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2542 GBV_ILN_4277 GBV_ILN_4330 AR 76 2022 8 24 05 722-731 |
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10.1515/hf-2022-0053 doi (DE-627)OLC2143102402 (DE-B1597)hf-2022-0053-p DE-627 ger DE-627 rakwb eng 620 VZ 670 VZ 23 ssgn Ito, Hiroaki verfasserin aut Formation rate of benzyl cations in various aqueous solutions containing different concentrations of acid but with a specific proton activity in lignin acidolysis 2022 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © 2022 Walter de Gruyter GmbH, Berlin/Boston Abstract This study aimed to clarify the effect of different solvents, aqueous 1,4-dioxane, ethanol, or ethylene glycol at various mol%, on the formation rate of the benzyl cation, which forms via two steps, the protonation of the benzyl hydroxy or alkoxy group as a pre-equilibrium step and subsequent liberation of the water or corresponding alcohol molecule, respectively, in a model system of the lignin acidolysis, focusing on distinguishing the effects on both steps. For this aim, the acidolysis reactions were conducted in various aqueous solutions and organic solvents that showed a specific proton activity to establish the pre-equilibrium at a specific position. The formation rate of the benzyl cation showed minima in the intermediate mol% range. However, these rate differences were much smaller than those observed in the previous report where the aqueous solutions were prepared to contain a specific acid concentration and show different proton activities and thus the net effect of the solvent type on both steps was indistinguishable. These results clearly showed that the solvent type affects the first step (the proton activity) much more than the last step (the solvent-dissociating power). This paper also describes the preparation of the aqueous solutions to demonstrate a specific proton activity. Yokoyama, Tomoya aut Enthalten in Holzforschung De Gruyter, 1947 76(2022), 8 vom: 24. Mai, Seite 722-731 (DE-627)129594938 (DE-600)240587-8 (DE-576)015087832 0018-3830 nnns volume:76 year:2022 number:8 day:24 month:05 pages:722-731 https://doi.org/10.1515/hf-2022-0053 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-FOR SSG-OPC-FOR GBV_ILN_40 GBV_ILN_70 GBV_ILN_252 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2542 GBV_ILN_4277 GBV_ILN_4330 AR 76 2022 8 24 05 722-731 |
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10.1515/hf-2022-0053 doi (DE-627)OLC2143102402 (DE-B1597)hf-2022-0053-p DE-627 ger DE-627 rakwb eng 620 VZ 670 VZ 23 ssgn Ito, Hiroaki verfasserin aut Formation rate of benzyl cations in various aqueous solutions containing different concentrations of acid but with a specific proton activity in lignin acidolysis 2022 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © 2022 Walter de Gruyter GmbH, Berlin/Boston Abstract This study aimed to clarify the effect of different solvents, aqueous 1,4-dioxane, ethanol, or ethylene glycol at various mol%, on the formation rate of the benzyl cation, which forms via two steps, the protonation of the benzyl hydroxy or alkoxy group as a pre-equilibrium step and subsequent liberation of the water or corresponding alcohol molecule, respectively, in a model system of the lignin acidolysis, focusing on distinguishing the effects on both steps. For this aim, the acidolysis reactions were conducted in various aqueous solutions and organic solvents that showed a specific proton activity to establish the pre-equilibrium at a specific position. The formation rate of the benzyl cation showed minima in the intermediate mol% range. However, these rate differences were much smaller than those observed in the previous report where the aqueous solutions were prepared to contain a specific acid concentration and show different proton activities and thus the net effect of the solvent type on both steps was indistinguishable. These results clearly showed that the solvent type affects the first step (the proton activity) much more than the last step (the solvent-dissociating power). This paper also describes the preparation of the aqueous solutions to demonstrate a specific proton activity. Yokoyama, Tomoya aut Enthalten in Holzforschung De Gruyter, 1947 76(2022), 8 vom: 24. Mai, Seite 722-731 (DE-627)129594938 (DE-600)240587-8 (DE-576)015087832 0018-3830 nnns volume:76 year:2022 number:8 day:24 month:05 pages:722-731 https://doi.org/10.1515/hf-2022-0053 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-FOR SSG-OPC-FOR GBV_ILN_40 GBV_ILN_70 GBV_ILN_252 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2542 GBV_ILN_4277 GBV_ILN_4330 AR 76 2022 8 24 05 722-731 |
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10.1515/hf-2022-0053 doi (DE-627)OLC2143102402 (DE-B1597)hf-2022-0053-p DE-627 ger DE-627 rakwb eng 620 VZ 670 VZ 23 ssgn Ito, Hiroaki verfasserin aut Formation rate of benzyl cations in various aqueous solutions containing different concentrations of acid but with a specific proton activity in lignin acidolysis 2022 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © 2022 Walter de Gruyter GmbH, Berlin/Boston Abstract This study aimed to clarify the effect of different solvents, aqueous 1,4-dioxane, ethanol, or ethylene glycol at various mol%, on the formation rate of the benzyl cation, which forms via two steps, the protonation of the benzyl hydroxy or alkoxy group as a pre-equilibrium step and subsequent liberation of the water or corresponding alcohol molecule, respectively, in a model system of the lignin acidolysis, focusing on distinguishing the effects on both steps. For this aim, the acidolysis reactions were conducted in various aqueous solutions and organic solvents that showed a specific proton activity to establish the pre-equilibrium at a specific position. The formation rate of the benzyl cation showed minima in the intermediate mol% range. However, these rate differences were much smaller than those observed in the previous report where the aqueous solutions were prepared to contain a specific acid concentration and show different proton activities and thus the net effect of the solvent type on both steps was indistinguishable. These results clearly showed that the solvent type affects the first step (the proton activity) much more than the last step (the solvent-dissociating power). This paper also describes the preparation of the aqueous solutions to demonstrate a specific proton activity. Yokoyama, Tomoya aut Enthalten in Holzforschung De Gruyter, 1947 76(2022), 8 vom: 24. Mai, Seite 722-731 (DE-627)129594938 (DE-600)240587-8 (DE-576)015087832 0018-3830 nnns volume:76 year:2022 number:8 day:24 month:05 pages:722-731 https://doi.org/10.1515/hf-2022-0053 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-FOR SSG-OPC-FOR GBV_ILN_40 GBV_ILN_70 GBV_ILN_252 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2542 GBV_ILN_4277 GBV_ILN_4330 AR 76 2022 8 24 05 722-731 |
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| doi_str_mv |
10.1515/hf-2022-0053 |
| dewey-full |
620 670 |
| title_sort |
formation rate of benzyl cations in various aqueous solutions containing different concentrations of acid but with a specific proton activity in lignin acidolysis |
| title_auth |
Formation rate of benzyl cations in various aqueous solutions containing different concentrations of acid but with a specific proton activity in lignin acidolysis |
| abstract |
Abstract This study aimed to clarify the effect of different solvents, aqueous 1,4-dioxane, ethanol, or ethylene glycol at various mol%, on the formation rate of the benzyl cation, which forms via two steps, the protonation of the benzyl hydroxy or alkoxy group as a pre-equilibrium step and subsequent liberation of the water or corresponding alcohol molecule, respectively, in a model system of the lignin acidolysis, focusing on distinguishing the effects on both steps. For this aim, the acidolysis reactions were conducted in various aqueous solutions and organic solvents that showed a specific proton activity to establish the pre-equilibrium at a specific position. The formation rate of the benzyl cation showed minima in the intermediate mol% range. However, these rate differences were much smaller than those observed in the previous report where the aqueous solutions were prepared to contain a specific acid concentration and show different proton activities and thus the net effect of the solvent type on both steps was indistinguishable. These results clearly showed that the solvent type affects the first step (the proton activity) much more than the last step (the solvent-dissociating power). This paper also describes the preparation of the aqueous solutions to demonstrate a specific proton activity. © 2022 Walter de Gruyter GmbH, Berlin/Boston |
| abstractGer |
Abstract This study aimed to clarify the effect of different solvents, aqueous 1,4-dioxane, ethanol, or ethylene glycol at various mol%, on the formation rate of the benzyl cation, which forms via two steps, the protonation of the benzyl hydroxy or alkoxy group as a pre-equilibrium step and subsequent liberation of the water or corresponding alcohol molecule, respectively, in a model system of the lignin acidolysis, focusing on distinguishing the effects on both steps. For this aim, the acidolysis reactions were conducted in various aqueous solutions and organic solvents that showed a specific proton activity to establish the pre-equilibrium at a specific position. The formation rate of the benzyl cation showed minima in the intermediate mol% range. However, these rate differences were much smaller than those observed in the previous report where the aqueous solutions were prepared to contain a specific acid concentration and show different proton activities and thus the net effect of the solvent type on both steps was indistinguishable. These results clearly showed that the solvent type affects the first step (the proton activity) much more than the last step (the solvent-dissociating power). This paper also describes the preparation of the aqueous solutions to demonstrate a specific proton activity. © 2022 Walter de Gruyter GmbH, Berlin/Boston |
| abstract_unstemmed |
Abstract This study aimed to clarify the effect of different solvents, aqueous 1,4-dioxane, ethanol, or ethylene glycol at various mol%, on the formation rate of the benzyl cation, which forms via two steps, the protonation of the benzyl hydroxy or alkoxy group as a pre-equilibrium step and subsequent liberation of the water or corresponding alcohol molecule, respectively, in a model system of the lignin acidolysis, focusing on distinguishing the effects on both steps. For this aim, the acidolysis reactions were conducted in various aqueous solutions and organic solvents that showed a specific proton activity to establish the pre-equilibrium at a specific position. The formation rate of the benzyl cation showed minima in the intermediate mol% range. However, these rate differences were much smaller than those observed in the previous report where the aqueous solutions were prepared to contain a specific acid concentration and show different proton activities and thus the net effect of the solvent type on both steps was indistinguishable. These results clearly showed that the solvent type affects the first step (the proton activity) much more than the last step (the solvent-dissociating power). This paper also describes the preparation of the aqueous solutions to demonstrate a specific proton activity. © 2022 Walter de Gruyter GmbH, Berlin/Boston |
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| container_issue |
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| title_short |
Formation rate of benzyl cations in various aqueous solutions containing different concentrations of acid but with a specific proton activity in lignin acidolysis |
| url |
https://doi.org/10.1515/hf-2022-0053 |
| remote_bool |
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| author2 |
Yokoyama, Tomoya |
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| up_date |
2024-07-03T15:13:00.838Z |
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