Synthesis and Characterization of Benzannelated Thienyl Oligomers

Abstract

An array of 1,3-diarylbenzo[c]thiophenes have been synthesized by the ring-opening of lactones followed by thionation using Lawesson's reagent with concurrent intramolecular cyclization. Photophysical studies of the various benzo[c]thiophene analogues are presented. The results of a cyclic vol-

Benzo[c]thiophene Chromophores Linked to Cationic Fe and Ru Derivatives for NLO Materials: Synthesis Characterization and Quadratic Hyperpolarizabilities

“…The lowest-energy band is within the range found for benzo[c]thiophene derivatives [36,37] and can be assigned to a π-π* electronic transition. The main feature of the spectra of the complexes recorded in CHCl 3 is the presence of an intense broad band in the range of 473-478 nm with a band at higher energy (in the range of ca.…”

A Versatile Synthesis of Annulated Carbazole Analogs Involving a Domino Reaction of Bromomethylindoles with Arenes/Heteroarenes

“…The heteroarylation of 2-bromomethylindole 1c with benzo[b]thiophene at room temperature followed by subsequent thermolysis at 80°C for 1 h led to an inseparable mixture of annulated 535 Scheme 9. Heteroarylation of bromide 1e with 1-(4-methoxyphenyl)-3-(thiophen-2-yl)benzo[c]thiophene (38) [29] at room temperature for 4 h followed by thermolysis at 80°C for 1 h led to the isolation of annulation product 39 in 60 % yield (Scheme 13). Finally, the bisannulation of bromide 40 [30] was performed with m-xylene and p-xylene with the use of ZnBr 2 (4 equiv.)…”

“…To a solution of substrate 1e (0.3 g, 0.57 mmol) in dry 1,2-DCE (10 mL) was added ZnBr 2 (0.26 g, 1.15 mmol) and 38 [29] (0.22 g, 0.68 mmol). The reaction mixture was stirred at room temperature for 4 h and then heated at reflux for 1 h under a nitrogen atmosphere.…”

A Simple and Efficient Synthesis of Ethyl 1‐Aryl‐4‐formyl‐1H‐pyrazole‐3‐carboxylates

“…Aromatic or heteroaromatic compounds possessing two carbonyl groups in the ortho‐positions are versatile building blocks for the synthesis of condensed heterocycles such as fused [ c ]furans [14], [ c ]thiophenes [15], [ c ]pyrroles [16], and [ d ]oxazines [17]. We have also studied some properties of the compounds 4 .…”