Copper complex of deuteroporphyrin dimethyl ester (2) was formylated with trimethyl orthoformate in the presence of tin(IV) chloride, followed by demetallation with H 2 SO 4 -CF 3 COOH and separation by column chromatography to give 3- (5) and 8-formyl compounds (6) in 46 and 47% yields, respectively. The Wittig reaction of these formylporphyrins gave highly functionallized...
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