2-[2-(1,3-Dioxolan-2-yl)vinyl]-5,10,15,20-tetraphenylporphyrin and its copper complex were reduced into the corresponding ethyldioxolanes by diimide generated in the system hydrazine hydrate -air oxygenpyridine. The hydrolysis of the obtained ethyldioxolanes results in the formylethyl derivatives that react with the methylenetriphenylphosphorane to form 2-(3-butenyl)-5,10,15,20-tetraphenyl porphyrin and its copper complex.
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