Search

The synthesis of two novel π-extended oligomers, incorporating naphtho[1,2-b]thiophene-4-carboxylate 2-octyldodecyl esters as end-capping moieties, and two different conjugated core fragments, has been achieved through a cascade sequence of sustainable organic reactions. Benzo[c][1,2,5]thiadiazole and 2-octyldodecyl benzo[1,2-b:6,5-b′]dithiophene-4-carboxylate have been used, respectively, as electron-poor and electro-rich π-conjugated cores. In the latter case, a sequence of nine aromatic rings in a fully conjugated structure is achieved with a high yielding, sustainable cascade approach. The optoelectronic properties of both oligomers are reported.

This study illustrates the synthesis and spectroscopic study of new β-lactam and novel Pyrrolone derivatives with the study of their antioxidant and antibacterial activities. This study included two major steps, the first step involved the synthesis of imine derivatives (3a-j) from sulfadiazine. The second step contained the synthesis of 2-Azetidinone (4a-j) and Pyrrolone (5a-j) heterocyclic compounds that have been generated through the reaction between synthesized imine derivatives with chloroacetyl chloride and fumaryl chloride in the presence of triethylamine, respectively. The structures of the synthesized compounds were confirmed on the basis of their spectral data such as FT-IR, 1H-NMR and 13C-NMR spectra, which provided the expected frequencies and signals. Lastly, all products were screened for the antioxidant activity and against two kinds of bacteria Staphylococcus aureus G (+ve) and Escherichia coli G (-ve) microorganisms. The products showed lower to high antioxidant activity as compared to standard ascorbic acid. Some of the products evaluated inactive and others slight to high activity against both kinds of bacteria.

The synthesis and characterization of four novel donor-acceptor-donor &pi, extended oligomers, incorporating naphtha(1&ndash, b)thiophene-4-carboxylate or benzo(b)thieno(3,2-g) benzothiophene-4-carboxylate 2-octyldodecyl esters as end-capping moieties, and two different conjugated core fragments, is reported. The end-capping moieties are obtained via a cascade sequence of sustainable organic reactions, and then coupled to benzo(c)(1,2,5)thiadiazole and its difluoro derivative as the electron-poor &pi, conjugated cores. The optoelectronic properties of the oligomers are reported. The novel compounds revealed good film forming properties, and when tested in bulk-heterojunction organic photovoltaic cell devices in combination with PC61BM, revealed good fill factors, but low efficiencies, due to their poor absorption profiles.

C-10b Functionalized 5,6-dihydropyrrolo(2,1-a)isoquinolines have been prepared via Parham cyclization and α-amidoalkylation reactions, using functionalized organolithium reagents. Their utility as intermediates in the synthesis of erythrinanes via intra or intermolecular conjugate addition reactions has been studied. Thus, a protocol for preparing the erythrinane skeleton through a Parham cyclization−intermolecular α-amidoalkylation−intermolecular conjugate addition−ring-closing metathesis process has been described.