English: Vitamin B12 total syntheses (ETH A/D approach to cobyric acid)ː Photochemical A/D-seco-corrin → corrin cycloisomerization (key step of the ETH A/D approach) to the "common corrinoid intermediate", a 5,15-bisnor-cobyrinate bearing a nitrile group at the ring-D f-propionic acid side chain, and ester groups at all other acetic and propionic acid side chains
Eschenmoser, A. (1971). Studies on Organic Synthesis. XXIIIrd International Congress of Pure and Applied Chemistry: special lectures presented at Boston, USA, 26-30 July 1971. 2. London: Butterworths. pp. 69–106. doi:10.3929/ethz-a-010165162. hdl:20.500.11850/84699. ISBN0-408-70316-4
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Vitamin B12 total syntheses (ETH A/D approach to cobyric acid): Photochemical A/D-seco-corrin → corrin cycloisomerization to the "common corrinoid intermediate"