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The formation and some spectroscopic properties of NN'-dimethylaetioporphyrin-I and NN'-dimethyloctaethylporphyrin are described.

Methyl fluorosulphonate N-methylates octa-NN'N''-trimethylporphin) which decomposed on chrom ethylporphyrin and octaethylchlorin to give, depending atography (alumina) to the AC isomer (I; R1 = H, Rupon the reaction conditions, N-methyloctaethylporphy-= Me, X = SO,F) . When octaethylporphyrin was heated rin, two NN'-dimethylporphins, NN""-trimethylocta-in methyl fluorosulphonate a t 100' for five days (sealed tube) ethylporphin, and an N-methyloctaethylchlorin. the NN'N"-trimethylporphin (I; R1 = R2 = Me, X = C1, WE have previously shown that methylation of octaethylporphyrin with methyl iodide gives both the N-methyl-and the NN'-dimethyl-porphin (I; R1 = Me, R 2 = H, X = I).W Methylation with methyl fluoro~ulphonate,~ in the cold, gave the same two products, N-methyloctaethylporphyrin (22%), 1n.p. 225-227", and the NN'-dimethylporphin (I;

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