1. (a) Troian-Gautier, L.; Moucheron, C. Molecules 2014, 19, 5028. (b) Lindhorst, A. C.; Haslinger, S.; Kühn, F. E. Chem. Commun. 2015, 51, 17193.
2. (a) Introduction to Organic Electronic and Optoelectronic Materials and Devices; Sun, S.-S.; Dalton, L. R., Eds.; CRC Press: Boca Raton, 2008. (b) Organic Optoelectronic Materials; Li, Y., Ed.; Springer: New York, 2015. (c) Organic Photovoltaics: Materials, Device Physics, and Manufacturing Technologies; Brabec, C.; Scherf, U.; Dyakonov, V., Eds.; Wiley-VCH: Weinheim, 2014, 2nd ed.
3. (a) Stockdale, T. P.; Williams, C. M. Chem. Soc. Rev. 2015, 44, 7737. (b) Liu, J.; Sridhar, J.; Foroozesh, M. Molecules 2013, 18, 14470. (c) Kovacic, P.; Somanathan R. Open J. Prev. Med. 2014, 4, 583. (d) Becker, F. F.; Banik, B. K. Front. Chem. 2014, 2, 55, DOI: 10.3389/fchem.2014.00055 .
4. Grzybowski, M.; Skonieczny, K.; Butenschön, H.; Gryko, D. T. Angew. Chem., Int. Ed. 2013, 52, 9900.
5. Vilsmeier, A.; Haack, A. Ber. Dtsch. Chem. Ges. 1927, 60, 119.