Photochemical substitution of halogenopyrrole derivatives

A resonance Raman spectroscopic and CASSCF investigation of the Franck–Condon region structural dynamics and conical intersections of thiophene

“…It appears that almost all of the previous assignments agree that the low-lying intense transition at 41 595 cm −1 ͑5.15 eV͒ is the vibrational origin of the 1 1 A 1 → 2 1 A 1 transition. 25 A reaction mechanism proposed by D'Auria and co-workers 26,27 suggested that the initially excited thiophenes undergo intersystem crossing ͑ISC͒ to a triplet state ͑-‫ء‬ , n-‫ء‬ , or -‫ء‬ ͒ mainly localized on the carbon-iodine bond and the resulting thiophene triplet state interacts with the aromatic compounds to result in homolytic cleavage of the CI bond to produce a thienyl radical that subsequently reacts very fast with the aromatic compound to produce the corresponding arylation product. 24 The 965 cm −1 progression was found to dominate the absorption spectrum due to 1083 cm −1 vibration.…”

Electrophilic Iodination of Organic Compounds Using Elemental Iodine or Iodides

“…Pyrrole derivative 216 was iodinated to its 5-iodo analogue 217 and 4,5-diodo analogue 218 using molecular iodine and bis(trifluoroacetoxy)iodobenzene (Scheme 17). 157 This method was also used for monoiodination of calix[4]pyrroles 158 and indole derivatives. 107 Substituted indole derivatives 219 were also iodinated with the mercury(I) oxide and molecular iodine combination to 3-iodo-substituted derivatives 220, 159 while 2,2¢-biindole was iodinated to its 3,3¢-diiodo derivative by molecular iodine in the presence of ethanolic potassium hydroxide.…”

Side-chain liquid crystalline polyacrylates containing 3,4-disubstituted pyrrole moiety

“…3,4-Dimethylpyrrole was prepared according to the literature. 25 3,4-Dimethylpyrrolyl potassium salt was synthesized in the same way as was pyrrolyl potassium salt, and used for the next reaction as soon as possible. 26 4-[(11-Acryloyloxy)undecanoxy]benzoic acid was prepared according to the literature.…”