Aromaticity switching via azulene transformations in azulene-bridged A,D-dithiahexaphyrin.
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DOI: 10.1039/c7cc08754c
Abstract: The incorporation of an azulene bridge into an aromatic hexaphyrin framework allows manipulating π-electron delocalization pathways. The palladium(ii) complex undergoes hydroxyl-triggered azulene contraction or isomerization to an oxynaphthalene unit, transforming the hexaphyrin framework into meso-linked… read more here.
Keywords: transformations azulene; via azulene; switching via; azulene transformations ... See more keywords
5,20-Diheterohexaphyrins: metal-template-free synthesis and aromaticity switching.
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DOI: 10.1039/c9cc05580k
Abstract: As the first example of expanded heteroporphyrins with heteroatoms at meso-positions, 5,20-dithiahexaphyrins and 5,20-diazahexaphyrins were synthesized via nucleophilic substitution reactions of α,α'-dibromotripyrrin as the key step. While 5,20-dithiahexaphyrins are practically nonaromatic, 5,20-[28]diazahexaphyrins show weakly antiaromatic… read more here.
Keywords: diheterohexaphyrins metal; free synthesis; aromaticity; template free ... See more keywords