K. Ludtke et al., A NEW APPROACH TO THE SYNTHESIS OF UNSATURATED BETA-SUBSTITUTED-MESO-TETRAPHENYLPORPHYRINS, Heterocyclic communications, 3(6), 1997, pp. 503-506
Treatment of nickel (II) complexes of beta-diazonium-meso-tetraphenylp
orphyrin salts with alpha,beta-unsaturated carbonyl compounds, in the
presence of palladium acetate, affords the corresponding unsaturated b
eta-substituted porphyrin.