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1
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79952941590
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For some representative examples, see
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For some representative examples, see
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2
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37049089069
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See our previous communication:, M. Alajarin, B. Bonillo, M.-M. Ortin, P. Sanchez-Andrada, A. Vidal, Org. Lett. 2006, 8, 5645-5648.
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For a recent related report, see
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For a recent related report, see:, M. Alajarin, B. Bonillo, M.-M. Ortin, P. Sanchez-Andrada, A. Vidal, R.-A. Orenes, Org. Biomol. Chem. 2010, 8, 4690-4700.
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For reviews in the chemistry of ketenimines, see
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33750005055
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For a recent report dealing with a [3,3] sigmatropic rearrangement in keteniminium salts, see:, J. Org. Chem. 2006, 71, 8126 -8139
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M. Alajarin, M.-M. Ortin, P. Sanchez-Andrada, A. Vidal, J. Org. Chem. 2006, 71, 8126-8139. For a recent report dealing with a [3,3] sigmatropic rearrangement in keteniminium salts, see:, M. Alajarin, M.-M. Ortin, P. Sanchez-Andrada, A. Vidal, J. Org. Chem. 2006, 71, 8126 -8139.
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58
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79952964953
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-
Comparable [1,5]-H shifts to central carbon atoms in allene fragments are known to occur with relative ease, see for instance
-
Comparable [1,5]-H shifts to central carbon atoms in allene fragments are known to occur with relative ease, see for instance
-
-
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59
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84979432079
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H. Heimgartner, Z. Zsindely, H.-J. Hansen, H. Schmid, Helv. Chim. Acta 1970, 53, 1212-1215.
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79952939379
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For the method of preparation of compounds 4, 7, 8, 24b - e, 24g and 24h and their analytical and spectroscopic data see ref. [4a]
-
For the method of preparation of compounds 4, 7, 8, 24b-e, 24g and 24h and their analytical and spectroscopic data see ref. [4a].
-
-
-
-
65
-
-
79952950364
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-
For reviews on carbodiimide chemistry, see
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For reviews on carbodiimide chemistry, see
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-
-
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70
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79952973506
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For some examples of metal-catalysed carbodiimide metathesis see
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For some examples of metal-catalysed carbodiimide metathesis see
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-
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73
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17644404373
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references therein
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J. Louie, Curr. Org. Chem. 2005, 9, 605-623, and references therein.
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Bell, S.A.1
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77
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79952915728
-
-
The structure of the pyrazolo-pyridone 35 was unequivocally determined by X-ray analysis, although the collected data are of low quality for publication. Its analytical and spectroscopic data are in full agreement with such structure
-
The structure of the pyrazolo-pyridone 35 was unequivocally determined by X-ray analysis, although the collected data are of low quality for publication. Its analytical and spectroscopic data are in full agreement with such structure.
-
-
-
-
78
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79952945818
-
-
Note that the 1,3-dioxolane-ketenimine 37b appears in the experimental study numbered as 1a, but for the sake of avoiding confusion we have used a different numeration in the computational section
-
Note that the 1,3-dioxolane-ketenimine 37b appears in the experimental study numbered as 1a, but for the sake of avoiding confusion we have used a different numeration in the computational section.
-
-
-
-
79
-
-
79952913531
-
-
-1
-
-1.
-
-
-
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80
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79952933092
-
-
The energy barriers are relative to the most stable conformers of the reactant heterocumulenes and of the o-azaxylylene intermediates
-
The energy barriers are relative to the most stable conformers of the reactant heterocumulenes and of the o-azaxylylene intermediates.
-
-
-
-
81
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79952926204
-
-
We have recently reported similar electrocyclic ring closures and characterized the corresponding transition states as pseudopericyclic; see reference 1n and references cited herein
-
We have recently reported similar electrocyclic ring closures and characterized the corresponding transition states as pseudopericyclic; see reference 1n and references cited herein.
-
-
-
-
82
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79952907301
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-
The energy of the LUMO orbital of the ketenimine is lower than that of the carbodiimide; consequently, the donor-acceptor interaction between a migrating hydride and the LUMO orbital of a heterocumulenic acceptor is more favourable in a ketenimine than in a carbodiimide
-
The energy of the LUMO orbital of the ketenimine is lower than that of the carbodiimide; consequently, the donor-acceptor interaction between a migrating hydride and the LUMO orbital of a heterocumulenic acceptor is more favourable in a ketenimine than in a carbodiimide.
-
-
-
-
83
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79952969151
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It is known that conjugating substituents produce large accelerations of the rate of nucleophilic additions to heterocumulenes such as ketenes, see: T. T. Tidwell (Ed.), John Wiley & Sons, New York, p. 581
-
It is known that conjugating substituents produce large accelerations of the rate of nucleophilic additions to heterocumulenes such as ketenes, see: T. T. Tidwell (Ed.), Ketenes, John Wiley & Sons, New York, 1995, p. 581.
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(1995)
Ketenes
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84
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0003842796
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