in the presence of trifluoroaceticacid, followed by oxidation of a pyriphlorin intermediate with silver(I) acetate, gave 6-oxopyriphlorins in moderate to good yields. The oxophlorin analogues were nonaromatic porphyrinoids that gave bright green colored solutions. Protonation with TFA afforded species that were attributed to mono- and dicationic structures. The proton NMR spectra in TFA–CDCl3 showed
Synthesis and Reactivity of <i>N</i>-Methyl and <i>N</i>-Phenyl <i>meso</i>-Unsubstituted N-Confused Porphyrins
作者:Timothy D. Lash、Amber L. Von Ruden
DOI:10.1021/jo802040q
日期:2008.12.5
and 1-phenyl-2,4-pyrroledicarbaldehydes with a tripyrrane in TFA-dichloromethane, followed by oxidation with aqueous FeCl(3), gave novel cross-conjugated meso-unsubstituted N-confusedporphyrins (NCPs; 12). These porphyrinanalogues showed significant diatropic ring currents that were enhanced upon protonation. Reactions with nickel(II) acetate in refluxing DMF, or palladium(II) acetate in acetonitrile