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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...
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