Synthese neuerN-Alkoxycarbonyl-2-aminobenzimidazol-Typen

Ruthenium complexes of 2-(2′-pyridyl)benzimidazole as photosensitizers for dye-sensitized solar cellsElectronic supplementary information (ESI) available: details of the luminescence measurements and solar cell construction and testing; synthesis details; 1H–1H COSY and NOESY 2D spectra for [(bpy)2Ru(pbimH)](PF6)2. See http://www.rsc.org/suppdata/dt/b2/b208289f/

“…22 There seemed to be no obvious and established route to the missing member of the series, pbimCO 2 H, save for reaction with ethyl chloroformate. 23 However, this failed because when hydrolysed from its ester form, decarboxylation occurred. Reactions to produce the other members of the series were carried out in DMF solution with potassium carbonate as the base, in which the bromo-substituted ester starting material was at risk of being hydrolysed.…”