Abstract.Irradiation of the 2-styrylpyrroles 3 and 5 resulted in intermolecular addition of the pyrrole derivative to the double bond of a second molecule in a regiospecific way to give the dimeric products 6 and 7 as the main products. The N-methyl-substituted derivative 4 did not show the same reaction, but reacts as the corresponding furan derivative.

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Photochemistry of β-(5-Substituted-2-furyl)-o-divinylbenzenes; Substituent Effects on the Reaction Course.--(SINDLER-KULYK, M.; KRAGOL, G.; PIANTANIDA, I.; TOMSIC, S.; VUJKOVIC CVIJIN, I.; MARINIC, Z.; METELKO, B.; Croat.

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