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Product specifications provided by the vendor (Novabiochem).
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For the nitrogen-containing resins, the degree of functionalization, f[mmol of functional fragment/g of resin] is calculated from the results of elemental analysis with the formula f, 0.714/n%N, where n is the number of nitrogen atoms in the functional unit and %N is the percent of nitrogen provided by the elemental analysis. For a given resin, the maximum possible substitution level fmax [mmol of functional fragment/g of resin] can be calculated with the formula fmax, fo/[1, fo(ΔMw) 10-3, where fo is the functionalization of the starting resin and ΔMw is the difference in molecular weight between the final and the initial functional fragments. The yield, ) of the considered step can then be evaluated as 100f/fmax
-
max.
-
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41
-
-
34047231019
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-
6 overnight before acquisition of the NMR spectra with the HRMAS probe.
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6 overnight before acquisition of the NMR spectra with the HRMAS probe.
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On the opposite side, when a low-loading resin (f = 0.29) prepared from a commercial Merrifield resin by reaction with defect sodium azide, capping with MeOH, and cycloaddition with amino alcohol 3a was used in the reaction, the enantiomeric purity of the resulting carbynol was 60 %. It is thus suggested that functionalization of the resin has an optimal value in the vicinity of f = 0.6 for this particular reaction.
-
On the opposite side, when a low-loading resin (f = 0.29) prepared from a commercial Merrifield resin by reaction with defect sodium azide, capping with MeOH, and cycloaddition with amino alcohol 3a was used in the reaction, the enantiomeric purity of the resulting carbynol was 60 %. It is thus suggested that functionalization of the resin has an optimal value in the vicinity of f = 0.6 for this particular reaction.
-
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50
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34047228163
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For example, phenylation of p-tolualdehyde with a Merrifield resin substituted with (R)-2-piperazino-1,1,2-triphenylethanol as the ligand 5 , furnishes the alcohol with 94% ee under similar conditions; see ref 5c
-
For example, phenylation of p-tolualdehyde with a Merrifield resin substituted with (R)-2-piperazino-1,1,2-triphenylethanol as the ligand (5 %) furnishes the alcohol with 94% ee under similar conditions; see ref 5c.
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