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A similar situation can also arise if nucleophilic addition to one diastereotopic face of a cationic intermediate proceeds at the diffusion control rate, whereas addition to the other face does not.
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1H NMR spectrum of the unpurified reaction mixture. Product diastereoselectivities were determined by GC analysis of the unpurified reaction mixture.
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The diastereoselectivities of nucleophilic substitutions obtained from the competition experiments were identical to those obtained from the individual reactions.
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3SiNC serving as the nucleophile.
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4NCN gave the cleanest reactions.
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