Planarization of donor–acceptor–donor (D–A–D) systems through N-bridges with systematic alteration of S/Se atom(s) resulted in interesting fluorosolvatochromic molecules and their electrochemical polymers.

A single-step intramolecular radical cascade reaction of diynes and thioacetic acid in the presence of a catalytic amount of azobis(isobutyronitrile) as a radical initiator has been developed to synthesize thiophenes. This method allows easy and effective construction of a thiophene scaffold having 3,4-fused-ring substitution and unsubstituted 2,5-positions for further functionalization and polymerization. Using this method, derivatives of cyclopenta[ c]thiophene, 3,4-ethylenedioxythiophene, and thiophene-containing spirocyclic compound have been synthesized.

A series of four thiophene and triazine containing conjugated porous polymers (CPPs) comprising of the same building block, tris(thienyl)triazine, is synthesized using the alkyne cyclotrimerization reaction for TT-CPP1, Sonogashira coupling...

We report here the first example of BF2 formazanates with thiophenes capping and their π-conjugated polymers in the form of electroactive uniform thin films by electrochemical polymerization. These new formazanates...

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Azulene is an on-alternant non-benzenoid aromatic system,a nd in turn, it possesses unusualp hotophysical properties. Azulene-based conjugated systems have received increasing interesti nr ecent years as optoelectronic materials. Despite the routes available for the preparationo fs ubstituted azulene derivatives, there remain few methods that allow regioselective substitution on the seven-membered ring of azulenes due to the subtle reactivity difference among the various positions. This report explores the reactivity of substituted tropolones as the azulene precursors and also provides anew method to create 5-substitutedazu-lenes. The reactiono fc yanoacetate enolate with unsubstituted 2-methoxytropone affords azulene through the attack of the nucleophile on the C-2 center( normal pathway). We have observed that 3-substituted 2-methoxytropones undergo steric-guided nucleophilic addition at the C-7 center (abnormalp athway) to afford 5-substituteda zulene derivatives. Based on this observation and DFT calculation, an ew synthetic strategy is devised for the regioselective synthesis of 5-substituted multifunctional azulenes, which cannot be accessed by any other method.Scheme1.Various approaches to azulene synthesis.[a] N.Supporting information (containingd etailed experimental procedures for the synthesis of all precursors and the azulene derivatives and references for compounds reported elsewhere) and the ORCID identification number(s) for the author(s)oft his article can be found under: https://doi.

Selenium is one of the eight necessary trace elements humans require for active health balance. It contributes in several ways to the proper functioning of selenoprotein. Selenium has received enormous interest recently due to its therapeutic potential against a number of ailments. To date, numerous chemical compounds containing selenium have been investigated for the therapy of cancer and other disorders. Unifying the selenium atom into chemical components (typically organic) greatly increased their bioactivities. We foresee that the structure–property relationship of recently developed materials could significantly decrease the laborious work of background research to achieve target-oriented drug design in coming years. This review summarizes the research progress in the last 10 to 15 years and the application of selenium-containing compounds in the design and synthesis of those materials for potential antioxidant and anticancer agents.

The chalcogen (O/S/Se)-induced intriguing variation of structural and optoelectronic properties in a series of chalcogenadiazole-fused indolo[2,3-a]carbazole donor–acceptor (D–A) molecules.