Corrin Syntheses. Part VI: Corrin Synthesis via A→D Ring Closure. The Construction of A/D‐Secocorrin Chromophore Systems by the 'Sulfide Contraction' Method and the Photochemical A/B‐Secocorrin→Corrin Cycloisomerization1. Issue 11 (December 2015) - Yamada, Yasuji
Abstract: As already extensively discussed in Part I of this series, the 'climax' of the studies at the ETH on the synthesis of corrins was reached with the conception and experimental realization of the corrin synthesis via a final ring closure between rings A and D by the photochemical A / D ‐secocorrin→corrin cycloisomerization. As it was the case for the ' old corrin synthesis ', described in Part IV of this series [4], the ' new synthesis ' was first explored in a model system, before it became the antetype of the photochemical variant of the synthesis of vitamin B12 .