English: Following the photochemical cycloisomerization of a Cd complex of an A/D-seco-corrin to the corrresponding metal-free corrin ligand by UV/VIS spectroscopy (A/D-corrin-ring closure by photochemical A/D-seco-corrin → corrin cycloisomerization, key step in the Eschenmoser approach to the Vitamin B12 total synthesis)
Eschenmoser, A.; Wintner, C. (1977). "Natural product synthesis and vitamin B12". Science. 196 (4297): 1410–1420; Fuhrer, Walter (1973). Totalsynthese von Vitamin B12: Der photochemische Weg. ETH Zürich (Promotionsarbeit Nr. 5158). doi:10.3929/ethz-a-000086601
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