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The CSD search provides 23 and 29 entries for 1 and 2, respectively, using the corresponding C4N3C1 scaffold. The experimental C-C1 bond length is found to be ca. 1.73 Å. See Figure 3 for comparison with computed values at different levels of theory. Indeed, a partial optimization at the same level of theory of compound 1 restraining the C-C1 distance to the experimental value showed a better agreement (168.2 vs 166.3 ppm).
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13C chemical shifts in both solvents (DFT(bs1)s1 -2//DFT-(bs1)s1-2) is shown in this table (entries 20 and 21). See the Supporting Information for the data of all 27 methodologies computed.
-
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65
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33645770607
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note
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We have used the scaled mean absolute error (CMAE) as the parameter to quantify the residuals between prediction and experiment. For proton chemical shifts the mean absolute error (MAE) was used instead as only two hydrogen atoms (aromatic) are analyzed.
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66
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33645778173
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note
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1/2- 1
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As a metric rule of thumb, if the value of interclass distance between categories is over 3 these classes are considered well classified. We here propose a much less strict criterion. It would be the hypothetical case where both cross errors are ca. double their own errors. The higher the number (we suggest here 3 as a minimum) the higher is the confidence in the assignation.
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