963068.sch.001
Scheme 1: Synthesis route for BPFC; (i) N-bromosuccinimide, acetone at 60°C 3 hours; (ii) bromobutane, powdered KOH, KI and DMSO, RT 12 hours; (iii) n-BuLi, Triisopropyl borate, THF, 2M HCl, −78°C, 4 hours; (iv) 4,4′-dibromo-2,2′-bipyridine, Ba(OH)2 8H2O, Pd(PPh3)4, dioxane/water, reflux, 24 hours; (v) Iodine, conc. H2SO4, HIO4, H2O, AcOH, 80°C, 4 hours; (vi) 3,6-di-tert-butyl-9H-carbazole, Cu Bronze, K2CO3, Nitrobenzene, reflux, 24 hours; (vii) [Ru(p-cymene)2Cl2]2, DMF, 60–70°C; (viii) 4,4′-dicarboxy-2,2′-bipyridine, NH4NCS, DMF, 8 hours, reflux.