New donor–π–acceptor pyrimidine-based dyes comprising an amide moiety as anchoring group have been designed. The were synthesized by sequential procedures based on the microwave-assisted Suzuki cross-coupling and bromination reactions. influence of dye structure length π-linker photophysical electrochemical properties photovoltaic effectiveness dye-sensitized solar cells was investigated. An in...

The crystal structure of the title compound, C(5)H(3)BrN(2)S, shows that bromination of 1H-thieno[2,3-d]imidazole with N-bromo-succinimide in acetonitrile occurs at position 5 of the bicyclic system. The mol-ecule is almost planar, with a mean deviation of 0.015 Å from the least-squares plane through all the non-H atoms. In the crystal, N-H⋯N hydrogen bonds link the mol-ecules into infinite C(4...

The reactivity of 2-bromo- and 2,5-dibromoselenophenes in Pd-catalyzed direct heteroarylation was investigated. From 2-bromoselenophene, only the most reactive heteroarenes could be employed to prepare 2-heteroarylated selenophenes; whereas, 2,5-dibromoselenophene generally gave 2,5-di(heteroarylated) selenophenes in high yields using both thiazole and thiophene derivatives. Moreover, sequentia...

Relative yields of C-6, C-8. and C-6 and C-8 substituted catechins obtained from the reaction of (+ )-catechin or 3' 4',57-tetra-O-methvl-( + )-catechin with pyridinium hydrobromide-perbromide, bromine. p-hydroxybenzyl al~oh~I, or o-hydroxybenZyI alcohol showed differing selectivities depending upon the electrophile used. Ratios of C-6 to C-8 substituted products were 1 : 1.2 for the reaction o...