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An improved synthesis of octaethylporphyrin.

Octaethylporphyrin (OEP, 1) is, by reason of its symmetry, high solubility, and stability, one of the more important and widely used models for the study of porphyrin chemistry. In the past, its synthesis has been tedious and erratic, particularly whenever more than a few grams were required. The usual syntheses, those of Inoffen et al. l and of Whitlock and Hanauer2 (based on earlier work of Eisner, Lichtarowicz, and Linstead),3 are summarized by Scheme 1.