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In general, syn-5a could be identified from its 13C signals of the mixture of 5a and 5b at all regions appearing consistently at more downfield compared to the corresponding signals of anti-5b. This could be evident from the fact that following oxidation of this isomeric mixture and K-selectride reduction of 6 (ref 15), the downfield signals of syn-5a enhanced very much. Hence, by determining the ratio of 13C signals of 5a,b, their relative proportion in a diasterisomeric mixture could be estimated. This could be evident from the 13C-NMR spectra of 5a,b mixtures obtained after low valent Cu mediated benzylation, benzyl Grignard addition and K-selectride reduction that was shown in the Supporting Information
-
In general, syn-5a could be identified from its 13C signals of the mixture of 5a and 5b at all regions appearing consistently at more downfield compared to the corresponding signals of anti-5b. This could be evident from the fact that following oxidation of this isomeric mixture and K-selectride reduction of 6 (ref 15), the downfield signals of syn-5a enhanced very much. Hence, by determining the ratio of 13C signals of 5a,b, their relative proportion in a diasterisomeric mixture could be estimated. This could be evident from the 13C-NMR spectra of 5a,b mixtures obtained after low valent Cu mediated benzylation, benzyl Grignard addition and K-selectride reduction that was shown in the Supporting Information.
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