Synthesis and photophysical properties of benzo[c]thiophene, p-phenylene-, triphenylamine-, and pyrene-based vinylenes

Exploiting a multicomponent domino reaction strategy for the tailoring of versatile environmentally sensitive fluorophore-based nicotinonitriles incorporating pyrene and fluorene moieties

“…These observations encouraged us to explore the catalytic prociency of AcOH in other solvents such as MeOH, 2-propanol, DMF, and dioxane, but no improvement in the yield of the target product 5a was observed ( Table 1, entries 12-15). Furthermore, we observe that the yields of 5a were distinctly affected by the amount of AcOH (Table 1, entries [16][17][18][19][20][21]. It was found that when the amount of acetic acid was increased, the desired product 5a was isolated in a signicantly higher yield.…”

“…The extremely uorescence properties of pyrene mean it is the rst choice uorophore in both fundamental and applied photochemical and photophysical research. [15][16][17][18][19][20][21] As its monomer emission typically appears at 370-420 nm and it is a distinguishing violet color, the pyrene moiety is considered to be one of the most benecial assembly moieties for the construction of uorogenic chemosensors that are frequently used for necessary chemical applications. 22 Pyrene derivatives have been extensively used in many applications as uorescent probes 23 and uorescent sensors.…”

The Synthesis of Tetrasubstituted Cycloalkenes Bearing π‐Conjugated Substituents and Their Optical Properties

“…Although a wide variety of procedures are available for the preparation of substituted pyrenes [18] and tetrasubstituted alkenes, [19] the preparation of alkenes with four, three, two, or one pyrene unit(s) can only be achieved using a few procedures. For instance, alkenes bearing four 4,5,9,10-tetrahydropyren-2-yl units can only be synthesized using the McMurry reaction, [20] whereas alkenes bearing two pyrenyl units directly attached to the double bond can be synthesized by means of the McMurry reaction, [21] the Wittig reaction, [22] Horner-Wadsworth-Emmons (HWE) modification, [23] metathesis, [24] carbonyl group condensation, [25] and the rhodium-catalyzed deoxygenation-Suzuki reaction sequence. [26] A similar trend can also be observed in relation to alkenes with two pyrene units that are connected to the double bond via a spacer.…”