《Palladium-catalyzed polyannulation of pyrazoles and diynes toward multifunctional poly(indazole)s under monomer non-stoichiometric conditions》 was published in Polymer Chemistry in 2019. These research results belong to Gao, Qingqing; Han, Ting; Qiu, Zijie; Zhang, Ruoyao; Zhang, Jun; Kwok, Ryan T. K.; Lam, Jacky W. Y.; Tang, Ben Zhong. Category: pyrazoles-derivatives The article mentions the following:
A new synthetic route toward multifunctional poly(indazole)s (PIs) with an effect of monomer stoichiometry imbalance-promoted polymerization is described in this work. The palladium-catalyzed oxidative polyannulations of internal diynes and 1-methylpyrazole proceed smoothly in 1,4-dioxane at 120°C with copper acetate monohydrate functioning as the oxidant. A series of PIs with high mol. weights (Mw up to 35 800) are generated in good yields (up to 84.0%) under monomer non-stoichiometric conditions. These polymers exhibit high thermal stability, losing merely 5% of their weights at high temperatures of 321-353°C. The solid thin films of these PIs show high and UV-tunable refractive indexes (n = 1.8870-1.6051) in a wide wavelength range of 400-900 nm. The tetraphenylethene-containing PI shows obvious solid-state emission properties and good photosensitivity. Its thin film was successfully fabricated into a well-defined two-dimensional fluorescent photopattern with sharp edges. The experimental part of the paper was very detailed, including the reaction process of 1-Methylpyrazole(cas: 930-36-9Category: pyrazoles-derivatives)
1-Methylpyrazole(cas: 930-36-9) belongs to pyrazoles. Pyrazole derivatives have been reported to exhibit a wide range of applications in medicinal chemistry and pharmacology. A large number of drugs incorporating pyrazole structure have been utilized as partial agonists for nicotinic acid receptors, antidepressants, antimicrobial agents, antiviral agents, and antifungal agents solely or along with the combination of other structural motifs.Category: pyrazoles-derivatives
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics