22867-05-6Relevant articles and documents
Lewis acid-catalyzed one-pot, three-component route to chiral 3,3′-bipyrroles
Dey, Sumit,Pal, Churala,Nandi, Debkumar,Giri, Venkatachalam Sesha,Zaidlewicz, Marek,Krzeminski, Marek,Smentek, Lidia,Hess Jr., B. Andes,Gawronski, Jacek,Kwit, Marcin,Babu, N. Jagadeesh,Nangia, Ashwini,Jaisankar, Parasuraman
supporting information; experimental part, p. 1373 - 1376 (2009/04/10)
(Chemical Equation Presented) 3,3′-Bipyrroles 3 could be synthesized using a double Michael addition reaction involving diaroyl acetylene 1 and the appropriate 1,3-dicarbonyls 2 using ammonium acetate as a nitrogen source. The axial chirality of bipyrrole was anticipated from the X-ray crystal structure and DFT calculations and confirmed by separating the racemates on a chiral column and subsequent CD spectra of the enantiomers. The absolute configuration of the enantiomers was achieved by theoretical CD spectra calculation using the ZINDO method.
Synthesis and characterization of some heterocyclic analogues of N,N′-perarylated phenylene-1,4-diamines and benzidines as a new class of hole transport materials
Schumann, Joerg,Kanitz, Andreas,Hartmann, Horst
, p. 1268 - 1276 (2007/10/03)
Starting from N,N-diarylsubstituted thioureas 20 and thioacetamides 21 a series of heterocyclic analogous of N,N′-perarylated phenylene-1,4-diamines and benzidines was obtained. These compounds represent, as studied by DSC measurements, a new class of hole transporting materials with high thermal stability and high tendency to form stable amorphous states. Moreover, some of the new compounds are, as measured by cyclic voltammetry, easily reversibly oxidized indicating the formation of persistent radical ions. Such compounds, which are, in general, completely substituted by aryl groups at their heterocyclic moieties, have been successfully used as hole-transport materials in OLEDs.
