Hematoporphyrin dimethyl ester 1, available in any desired amount from slaughter houses, can be transformed by a surprisingly simple reaction sequence into complex porphyrin structures of the isobacteriochlorin type such as 2. Such compounds play a key role as coenzymes in sulfite and nitrite reduction in microorganisms and plants.
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Montforts et al. (1989) studied this question.
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