The synthesis of the nickel(II) complex of (±)‐1,8,8,13,13‐pentamethyl‐trans‐corrin illustrates a synthetic route to the corrin system. Repeated use of triethyloxonium tetrafluoroborate in this synthesis demonstrates the preparative value of the trialkyloxonium salts discovered by Meerwein et al.
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Bertele et al. (1964) studied this question.
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