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racemised

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  • A second sulfur contraction (cyanoethyl phosphine/ trifluoroacetic acid/sulfolane) yielded cyanocorrigenolide 57 with the propionic acid ester group of ring C also racemised. Due to the steric bulk of both reactants this contraction was the only successful method. — “Vitamin B12 total synthesis - Wikipedia, the free encyclopedia”, en.wikipedia.org

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