Van Der Meijden, Maarten W.Gelens, EdithMurillo Quiros, NataliaFuhr, Javier D.Gayone, J. EstebanAscolani, HugoWurst, KlausLingenfelder, MagaliKellogg, Richard M.2016-04-012016-04-012016-04-01201610.1002/chem.201502798https://infoscience.epfl.ch/handle/20.500.14299/125427WOS:000368922500038A convergent synthesis of racemic 5-amino[6]hexahelicene is described. Cross-coupling reactions are used to assemble a pentacyclic framework, and a metal-catalyzed ring-closure comprises the final step. The enantiomers were separated by means of chromatography and the absolute configurations were assigned by comparison of the CD spectra with hexahelicene. The t(1/2) value for racemization at 210 degrees C was approximately 1 hour. Scanning tunneling microscopy (STM) measurements were carried out on enantiopure and racemic samples of aminohelicene on Au(111) under ultrahigh vacuum (UHV) conditions.cross-couplinghelicenesoptical propertiesresolutionscanning tunneling microscopytext::journal::journal article::research article