1,2-Eliminations from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ and ($ CH_{3} $)2NH2+: Guided dissociations
Abstract 1,2-Eliminations are a varied and extensive set of dissociations of ions in the gas phase. To understand better such dissociations, elimination of $ CH_{2} $=$ CH_{2} $ and $ CH_{3} $$ CH_{3} $ from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ (1) and of $ CH_{4} $ from ($ CH_{3} $)2NH2+ are...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Hudson, Charles E. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2008 |
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| Schlagwörter: |
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| Anmerkung: |
© American Society for Mass Spectrometry 2008 |
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| Übergeordnetes Werk: |
Enthalten in: Journal of the American Society for Mass Spectrometry - Springer-Verlag, 1990, 19(2008), 10 vom: 01. Okt., Seite 1491-1499 |
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| Übergeordnetes Werk: |
volume:19 ; year:2008 ; number:10 ; day:01 ; month:10 ; pages:1491-1499 |
| Links: |
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| DOI / URN: |
10.1016/j.jasms.2008.06.018 |
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| Katalog-ID: |
OLC2097675522 |
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| 245 | 1 | 0 | |a 1,2-Eliminations from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ and ($ CH_{3} $)2NH2+: Guided dissociations |
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| 520 | |a Abstract 1,2-Eliminations are a varied and extensive set of dissociations of ions in the gas phase. To understand better such dissociations, elimination of $ CH_{2} $=$ CH_{2} $ and $ CH_{3} $$ CH_{3} $ from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ (1) and of $ CH_{4} $ from ($ CH_{3} $)2NH2+ are characterized by quantum chemical calculations. Stretching of the CN bond to ethyl is followed by shift of an H from methyl to the bridging position in ethyl and then to N to reach ($ CH_{3} $)2NH2+ + $ CH_{2} $=$ CH_{2} $ from 1. $ CH_{3} $$ CH_{3} $ elimination by H-transfer to $ C_{2} $H5+ to form $ CH_{3} $$ NH^{+} $=$ CH_{2} $ + $ CH_{3} $$ CH_{3} $ also takes place. ($ CH_{3} $)2NH2+ eliminates methane by CN bond extension followed by β-H-transfer to give $ CH_{2} $=$ NH^{+} $ + $ CH_{4} $. Low-energy reactions resembling complex-mediated 1,2-eliminations occur and constitute a hitherto largely unrecognized type of reaction. As in many complex-mediated reactions, these reactions transfer H between incipient fragments. They are distinguished from complex-mediated processes by the fragments not being able to rotate freely relative to each other near the transition state for reaction, as they do in complexes. Most 1,2-eliminations are ion-neutral complex-mediated, occur by the just described lower energy reactions, have 1,1-like transition states, or utilize highly asynchronous 1,2 transition states. All of these avoid synchronized 1,2-transition states that would violate conservation of orbital symmetry. | ||
| 650 | 4 | |a Transition State | |
| 650 | 4 | |a Intrinsic Reaction Coordinate | |
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| 650 | 4 | |a Kinetic Energy Release | |
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| 700 | 1 | |a McAdoo, David J. |4 aut | |
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10.1016/j.jasms.2008.06.018 doi (DE-627)OLC2097675522 (DE-He213)j.jasms.2008.06.018-p DE-627 ger DE-627 rakwb eng 530 VZ 11 ssgn Hudson, Charles E. verfasserin aut 1,2-Eliminations from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ and ($ CH_{3} $)2NH2+: Guided dissociations 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © American Society for Mass Spectrometry 2008 Abstract 1,2-Eliminations are a varied and extensive set of dissociations of ions in the gas phase. To understand better such dissociations, elimination of $ CH_{2} $=$ CH_{2} $ and $ CH_{3} $$ CH_{3} $ from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ (1) and of $ CH_{4} $ from ($ CH_{3} $)2NH2+ are characterized by quantum chemical calculations. Stretching of the CN bond to ethyl is followed by shift of an H from methyl to the bridging position in ethyl and then to N to reach ($ CH_{3} $)2NH2+ + $ CH_{2} $=$ CH_{2} $ from 1. $ CH_{3} $$ CH_{3} $ elimination by H-transfer to $ C_{2} $H5+ to form $ CH_{3} $$ NH^{+} $=$ CH_{2} $ + $ CH_{3} $$ CH_{3} $ also takes place. ($ CH_{3} $)2NH2+ eliminates methane by CN bond extension followed by β-H-transfer to give $ CH_{2} $=$ NH^{+} $ + $ CH_{4} $. Low-energy reactions resembling complex-mediated 1,2-eliminations occur and constitute a hitherto largely unrecognized type of reaction. As in many complex-mediated reactions, these reactions transfer H between incipient fragments. They are distinguished from complex-mediated processes by the fragments not being able to rotate freely relative to each other near the transition state for reaction, as they do in complexes. Most 1,2-eliminations are ion-neutral complex-mediated, occur by the just described lower energy reactions, have 1,1-like transition states, or utilize highly asynchronous 1,2 transition states. All of these avoid synchronized 1,2-transition states that would violate conservation of orbital symmetry. Transition State Intrinsic Reaction Coordinate Phenyl Ether Kinetic Energy Release Orbital Symmetry McAdoo, David J. aut Enthalten in Journal of the American Society for Mass Spectrometry Springer-Verlag, 1990 19(2008), 10 vom: 01. Okt., Seite 1491-1499 (DE-627)130977357 (DE-600)1073671-2 (DE-576)277732093 1044-0305 nnns volume:19 year:2008 number:10 day:01 month:10 pages:1491-1499 https://doi.org/10.1016/j.jasms.2008.06.018 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-CHE GBV_ILN_70 GBV_ILN_2004 GBV_ILN_4012 GBV_ILN_4125 GBV_ILN_4307 AR 19 2008 10 01 10 1491-1499 |
| spelling |
10.1016/j.jasms.2008.06.018 doi (DE-627)OLC2097675522 (DE-He213)j.jasms.2008.06.018-p DE-627 ger DE-627 rakwb eng 530 VZ 11 ssgn Hudson, Charles E. verfasserin aut 1,2-Eliminations from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ and ($ CH_{3} $)2NH2+: Guided dissociations 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © American Society for Mass Spectrometry 2008 Abstract 1,2-Eliminations are a varied and extensive set of dissociations of ions in the gas phase. To understand better such dissociations, elimination of $ CH_{2} $=$ CH_{2} $ and $ CH_{3} $$ CH_{3} $ from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ (1) and of $ CH_{4} $ from ($ CH_{3} $)2NH2+ are characterized by quantum chemical calculations. Stretching of the CN bond to ethyl is followed by shift of an H from methyl to the bridging position in ethyl and then to N to reach ($ CH_{3} $)2NH2+ + $ CH_{2} $=$ CH_{2} $ from 1. $ CH_{3} $$ CH_{3} $ elimination by H-transfer to $ C_{2} $H5+ to form $ CH_{3} $$ NH^{+} $=$ CH_{2} $ + $ CH_{3} $$ CH_{3} $ also takes place. ($ CH_{3} $)2NH2+ eliminates methane by CN bond extension followed by β-H-transfer to give $ CH_{2} $=$ NH^{+} $ + $ CH_{4} $. Low-energy reactions resembling complex-mediated 1,2-eliminations occur and constitute a hitherto largely unrecognized type of reaction. As in many complex-mediated reactions, these reactions transfer H between incipient fragments. They are distinguished from complex-mediated processes by the fragments not being able to rotate freely relative to each other near the transition state for reaction, as they do in complexes. Most 1,2-eliminations are ion-neutral complex-mediated, occur by the just described lower energy reactions, have 1,1-like transition states, or utilize highly asynchronous 1,2 transition states. All of these avoid synchronized 1,2-transition states that would violate conservation of orbital symmetry. Transition State Intrinsic Reaction Coordinate Phenyl Ether Kinetic Energy Release Orbital Symmetry McAdoo, David J. aut Enthalten in Journal of the American Society for Mass Spectrometry Springer-Verlag, 1990 19(2008), 10 vom: 01. Okt., Seite 1491-1499 (DE-627)130977357 (DE-600)1073671-2 (DE-576)277732093 1044-0305 nnns volume:19 year:2008 number:10 day:01 month:10 pages:1491-1499 https://doi.org/10.1016/j.jasms.2008.06.018 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-CHE GBV_ILN_70 GBV_ILN_2004 GBV_ILN_4012 GBV_ILN_4125 GBV_ILN_4307 AR 19 2008 10 01 10 1491-1499 |
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10.1016/j.jasms.2008.06.018 doi (DE-627)OLC2097675522 (DE-He213)j.jasms.2008.06.018-p DE-627 ger DE-627 rakwb eng 530 VZ 11 ssgn Hudson, Charles E. verfasserin aut 1,2-Eliminations from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ and ($ CH_{3} $)2NH2+: Guided dissociations 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © American Society for Mass Spectrometry 2008 Abstract 1,2-Eliminations are a varied and extensive set of dissociations of ions in the gas phase. To understand better such dissociations, elimination of $ CH_{2} $=$ CH_{2} $ and $ CH_{3} $$ CH_{3} $ from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ (1) and of $ CH_{4} $ from ($ CH_{3} $)2NH2+ are characterized by quantum chemical calculations. Stretching of the CN bond to ethyl is followed by shift of an H from methyl to the bridging position in ethyl and then to N to reach ($ CH_{3} $)2NH2+ + $ CH_{2} $=$ CH_{2} $ from 1. $ CH_{3} $$ CH_{3} $ elimination by H-transfer to $ C_{2} $H5+ to form $ CH_{3} $$ NH^{+} $=$ CH_{2} $ + $ CH_{3} $$ CH_{3} $ also takes place. ($ CH_{3} $)2NH2+ eliminates methane by CN bond extension followed by β-H-transfer to give $ CH_{2} $=$ NH^{+} $ + $ CH_{4} $. Low-energy reactions resembling complex-mediated 1,2-eliminations occur and constitute a hitherto largely unrecognized type of reaction. As in many complex-mediated reactions, these reactions transfer H between incipient fragments. They are distinguished from complex-mediated processes by the fragments not being able to rotate freely relative to each other near the transition state for reaction, as they do in complexes. Most 1,2-eliminations are ion-neutral complex-mediated, occur by the just described lower energy reactions, have 1,1-like transition states, or utilize highly asynchronous 1,2 transition states. All of these avoid synchronized 1,2-transition states that would violate conservation of orbital symmetry. Transition State Intrinsic Reaction Coordinate Phenyl Ether Kinetic Energy Release Orbital Symmetry McAdoo, David J. aut Enthalten in Journal of the American Society for Mass Spectrometry Springer-Verlag, 1990 19(2008), 10 vom: 01. Okt., Seite 1491-1499 (DE-627)130977357 (DE-600)1073671-2 (DE-576)277732093 1044-0305 nnns volume:19 year:2008 number:10 day:01 month:10 pages:1491-1499 https://doi.org/10.1016/j.jasms.2008.06.018 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-CHE GBV_ILN_70 GBV_ILN_2004 GBV_ILN_4012 GBV_ILN_4125 GBV_ILN_4307 AR 19 2008 10 01 10 1491-1499 |
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10.1016/j.jasms.2008.06.018 doi (DE-627)OLC2097675522 (DE-He213)j.jasms.2008.06.018-p DE-627 ger DE-627 rakwb eng 530 VZ 11 ssgn Hudson, Charles E. verfasserin aut 1,2-Eliminations from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ and ($ CH_{3} $)2NH2+: Guided dissociations 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © American Society for Mass Spectrometry 2008 Abstract 1,2-Eliminations are a varied and extensive set of dissociations of ions in the gas phase. To understand better such dissociations, elimination of $ CH_{2} $=$ CH_{2} $ and $ CH_{3} $$ CH_{3} $ from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ (1) and of $ CH_{4} $ from ($ CH_{3} $)2NH2+ are characterized by quantum chemical calculations. Stretching of the CN bond to ethyl is followed by shift of an H from methyl to the bridging position in ethyl and then to N to reach ($ CH_{3} $)2NH2+ + $ CH_{2} $=$ CH_{2} $ from 1. $ CH_{3} $$ CH_{3} $ elimination by H-transfer to $ C_{2} $H5+ to form $ CH_{3} $$ NH^{+} $=$ CH_{2} $ + $ CH_{3} $$ CH_{3} $ also takes place. ($ CH_{3} $)2NH2+ eliminates methane by CN bond extension followed by β-H-transfer to give $ CH_{2} $=$ NH^{+} $ + $ CH_{4} $. Low-energy reactions resembling complex-mediated 1,2-eliminations occur and constitute a hitherto largely unrecognized type of reaction. As in many complex-mediated reactions, these reactions transfer H between incipient fragments. They are distinguished from complex-mediated processes by the fragments not being able to rotate freely relative to each other near the transition state for reaction, as they do in complexes. Most 1,2-eliminations are ion-neutral complex-mediated, occur by the just described lower energy reactions, have 1,1-like transition states, or utilize highly asynchronous 1,2 transition states. All of these avoid synchronized 1,2-transition states that would violate conservation of orbital symmetry. Transition State Intrinsic Reaction Coordinate Phenyl Ether Kinetic Energy Release Orbital Symmetry McAdoo, David J. aut Enthalten in Journal of the American Society for Mass Spectrometry Springer-Verlag, 1990 19(2008), 10 vom: 01. Okt., Seite 1491-1499 (DE-627)130977357 (DE-600)1073671-2 (DE-576)277732093 1044-0305 nnns volume:19 year:2008 number:10 day:01 month:10 pages:1491-1499 https://doi.org/10.1016/j.jasms.2008.06.018 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-CHE GBV_ILN_70 GBV_ILN_2004 GBV_ILN_4012 GBV_ILN_4125 GBV_ILN_4307 AR 19 2008 10 01 10 1491-1499 |
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10.1016/j.jasms.2008.06.018 doi (DE-627)OLC2097675522 (DE-He213)j.jasms.2008.06.018-p DE-627 ger DE-627 rakwb eng 530 VZ 11 ssgn Hudson, Charles E. verfasserin aut 1,2-Eliminations from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ and ($ CH_{3} $)2NH2+: Guided dissociations 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © American Society for Mass Spectrometry 2008 Abstract 1,2-Eliminations are a varied and extensive set of dissociations of ions in the gas phase. To understand better such dissociations, elimination of $ CH_{2} $=$ CH_{2} $ and $ CH_{3} $$ CH_{3} $ from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ (1) and of $ CH_{4} $ from ($ CH_{3} $)2NH2+ are characterized by quantum chemical calculations. Stretching of the CN bond to ethyl is followed by shift of an H from methyl to the bridging position in ethyl and then to N to reach ($ CH_{3} $)2NH2+ + $ CH_{2} $=$ CH_{2} $ from 1. $ CH_{3} $$ CH_{3} $ elimination by H-transfer to $ C_{2} $H5+ to form $ CH_{3} $$ NH^{+} $=$ CH_{2} $ + $ CH_{3} $$ CH_{3} $ also takes place. ($ CH_{3} $)2NH2+ eliminates methane by CN bond extension followed by β-H-transfer to give $ CH_{2} $=$ NH^{+} $ + $ CH_{4} $. Low-energy reactions resembling complex-mediated 1,2-eliminations occur and constitute a hitherto largely unrecognized type of reaction. As in many complex-mediated reactions, these reactions transfer H between incipient fragments. They are distinguished from complex-mediated processes by the fragments not being able to rotate freely relative to each other near the transition state for reaction, as they do in complexes. Most 1,2-eliminations are ion-neutral complex-mediated, occur by the just described lower energy reactions, have 1,1-like transition states, or utilize highly asynchronous 1,2 transition states. All of these avoid synchronized 1,2-transition states that would violate conservation of orbital symmetry. Transition State Intrinsic Reaction Coordinate Phenyl Ether Kinetic Energy Release Orbital Symmetry McAdoo, David J. aut Enthalten in Journal of the American Society for Mass Spectrometry Springer-Verlag, 1990 19(2008), 10 vom: 01. Okt., Seite 1491-1499 (DE-627)130977357 (DE-600)1073671-2 (DE-576)277732093 1044-0305 nnns volume:19 year:2008 number:10 day:01 month:10 pages:1491-1499 https://doi.org/10.1016/j.jasms.2008.06.018 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-CHE GBV_ILN_70 GBV_ILN_2004 GBV_ILN_4012 GBV_ILN_4125 GBV_ILN_4307 AR 19 2008 10 01 10 1491-1499 |
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To understand better such dissociations, elimination of $ CH_{2} $=$ CH_{2} $ and $ CH_{3} $$ CH_{3} $ from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ (1) and of $ CH_{4} $ from ($ CH_{3} $)2NH2+ are characterized by quantum chemical calculations. Stretching of the CN bond to ethyl is followed by shift of an H from methyl to the bridging position in ethyl and then to N to reach ($ CH_{3} $)2NH2+ + $ CH_{2} $=$ CH_{2} $ from 1. $ CH_{3} $$ CH_{3} $ elimination by H-transfer to $ C_{2} $H5+ to form $ CH_{3} $$ NH^{+} $=$ CH_{2} $ + $ CH_{3} $$ CH_{3} $ also takes place. ($ CH_{3} $)2NH2+ eliminates methane by CN bond extension followed by β-H-transfer to give $ CH_{2} $=$ NH^{+} $ + $ CH_{4} $. Low-energy reactions resembling complex-mediated 1,2-eliminations occur and constitute a hitherto largely unrecognized type of reaction. As in many complex-mediated reactions, these reactions transfer H between incipient fragments. 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Hudson, Charles E. |
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1,2-Eliminations from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ and ($ CH_{3} $)2NH2+: Guided dissociations |
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1,2-Eliminations from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ and ($ CH_{3} $)2NH2+: Guided dissociations |
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1,2-eliminations from ($ ch_{3} $)2$ nh^{+} $$ ch_{2} $$ ch_{3} $ and ($ ch_{3} $)2nh2+: guided dissociations |
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1,2-Eliminations from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ and ($ CH_{3} $)2NH2+: Guided dissociations |
| abstract |
Abstract 1,2-Eliminations are a varied and extensive set of dissociations of ions in the gas phase. To understand better such dissociations, elimination of $ CH_{2} $=$ CH_{2} $ and $ CH_{3} $$ CH_{3} $ from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ (1) and of $ CH_{4} $ from ($ CH_{3} $)2NH2+ are characterized by quantum chemical calculations. Stretching of the CN bond to ethyl is followed by shift of an H from methyl to the bridging position in ethyl and then to N to reach ($ CH_{3} $)2NH2+ + $ CH_{2} $=$ CH_{2} $ from 1. $ CH_{3} $$ CH_{3} $ elimination by H-transfer to $ C_{2} $H5+ to form $ CH_{3} $$ NH^{+} $=$ CH_{2} $ + $ CH_{3} $$ CH_{3} $ also takes place. ($ CH_{3} $)2NH2+ eliminates methane by CN bond extension followed by β-H-transfer to give $ CH_{2} $=$ NH^{+} $ + $ CH_{4} $. Low-energy reactions resembling complex-mediated 1,2-eliminations occur and constitute a hitherto largely unrecognized type of reaction. As in many complex-mediated reactions, these reactions transfer H between incipient fragments. They are distinguished from complex-mediated processes by the fragments not being able to rotate freely relative to each other near the transition state for reaction, as they do in complexes. Most 1,2-eliminations are ion-neutral complex-mediated, occur by the just described lower energy reactions, have 1,1-like transition states, or utilize highly asynchronous 1,2 transition states. All of these avoid synchronized 1,2-transition states that would violate conservation of orbital symmetry. © American Society for Mass Spectrometry 2008 |
| abstractGer |
Abstract 1,2-Eliminations are a varied and extensive set of dissociations of ions in the gas phase. To understand better such dissociations, elimination of $ CH_{2} $=$ CH_{2} $ and $ CH_{3} $$ CH_{3} $ from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ (1) and of $ CH_{4} $ from ($ CH_{3} $)2NH2+ are characterized by quantum chemical calculations. Stretching of the CN bond to ethyl is followed by shift of an H from methyl to the bridging position in ethyl and then to N to reach ($ CH_{3} $)2NH2+ + $ CH_{2} $=$ CH_{2} $ from 1. $ CH_{3} $$ CH_{3} $ elimination by H-transfer to $ C_{2} $H5+ to form $ CH_{3} $$ NH^{+} $=$ CH_{2} $ + $ CH_{3} $$ CH_{3} $ also takes place. ($ CH_{3} $)2NH2+ eliminates methane by CN bond extension followed by β-H-transfer to give $ CH_{2} $=$ NH^{+} $ + $ CH_{4} $. Low-energy reactions resembling complex-mediated 1,2-eliminations occur and constitute a hitherto largely unrecognized type of reaction. As in many complex-mediated reactions, these reactions transfer H between incipient fragments. They are distinguished from complex-mediated processes by the fragments not being able to rotate freely relative to each other near the transition state for reaction, as they do in complexes. Most 1,2-eliminations are ion-neutral complex-mediated, occur by the just described lower energy reactions, have 1,1-like transition states, or utilize highly asynchronous 1,2 transition states. All of these avoid synchronized 1,2-transition states that would violate conservation of orbital symmetry. © American Society for Mass Spectrometry 2008 |
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Abstract 1,2-Eliminations are a varied and extensive set of dissociations of ions in the gas phase. To understand better such dissociations, elimination of $ CH_{2} $=$ CH_{2} $ and $ CH_{3} $$ CH_{3} $ from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ (1) and of $ CH_{4} $ from ($ CH_{3} $)2NH2+ are characterized by quantum chemical calculations. Stretching of the CN bond to ethyl is followed by shift of an H from methyl to the bridging position in ethyl and then to N to reach ($ CH_{3} $)2NH2+ + $ CH_{2} $=$ CH_{2} $ from 1. $ CH_{3} $$ CH_{3} $ elimination by H-transfer to $ C_{2} $H5+ to form $ CH_{3} $$ NH^{+} $=$ CH_{2} $ + $ CH_{3} $$ CH_{3} $ also takes place. ($ CH_{3} $)2NH2+ eliminates methane by CN bond extension followed by β-H-transfer to give $ CH_{2} $=$ NH^{+} $ + $ CH_{4} $. Low-energy reactions resembling complex-mediated 1,2-eliminations occur and constitute a hitherto largely unrecognized type of reaction. As in many complex-mediated reactions, these reactions transfer H between incipient fragments. They are distinguished from complex-mediated processes by the fragments not being able to rotate freely relative to each other near the transition state for reaction, as they do in complexes. Most 1,2-eliminations are ion-neutral complex-mediated, occur by the just described lower energy reactions, have 1,1-like transition states, or utilize highly asynchronous 1,2 transition states. All of these avoid synchronized 1,2-transition states that would violate conservation of orbital symmetry. © American Society for Mass Spectrometry 2008 |
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1,2-Eliminations from ($ CH_{3} $)2$ NH^{+} $$ CH_{2} $$ CH_{3} $ and ($ CH_{3} $)2NH2+: Guided dissociations |
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