p-Benzoquinone-porphyrin-p-benzoquinone is the layer sequence in the sandwich compound shown on the cover. This compound is formed in 0.1% yield from 1, RCHO and pyrrole in refluxing propionic acid. The four bridges in the sandwich compound are short and contain no heteroatoms. It may serve as a model for the study of biochemically important electron-transfer reactions.
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Weiser et al. (1984) studied this question.
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