期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 13, 期 1, 页码 196-202出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200601147
关键词
C-H activation; palladium; porphyrinoids; structure elucidation
Conformational preference and chemical stability of meso-aryl-substituted [26]hexaphyrins(1.1.1.1.1.1) ([26]ArH) depend upon meso-aryl substituents. Although only a planar and rectangular conformation (type-II conformation) has been identified for [26]ArH so far, we have demonstrated here that a different conformation with all the pyrroles pointing inward (type-I conformation) is preferred for [26]ArH (7 and 11-I) bearing small 2-thienyl or 3-thineyl substituents at 15- and 30-positions. Both type-I and type-II [26]ArH exhibit diatropic ring currents, reflecting aromatic character. Type-I [26]ArH, such as 7 and 11-I, have been shown to serve as an effective ligand for Pd-II ions to provide bis-Pd-II complexes 12 and 13 with N3C1 coordination through facile C-H bond activation.
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