543694-92-4Relevant academic research and scientific papers
A novel one-pot approach to oxidative aromatization and bromination of pyrazolidin-3-one with HBr-H2O2 system
Yang, Shanguang,Liu, Jingjing,Jin, Zhudan,Tian, Wei,Sun, Hao,Wang, Mingliang
, p. 165 - 169 (2018)
An efficient and green one-pot method for the oxidative aromatization and bromination of pyrazolidin-3-ones under mild conditions with a HBr-H2O2 system was developed. A mechanism was proposed.
Pyrazolyl-substituted polyconjugated molecules for optoelectronic applications
Arba?iauskiene,Kazlauskas,Miasojedovas,Jur?enas,Jankauskas,Holzer,Getautis,?a?kus
scheme or table, p. 79 - 85 (2010/11/16)
Pyrazolyl-substituted diethylene derivative and its analogue containing additional cyano groups were synthesized and investigated as potential multifunctional materials for organic light emitting diodes. The influence of the electron affinitive cyano groups on the ionization potential (Ip) of the films as well as on the photoluminescence (PL) spectrum, PL quantum yield (η) and PL decay time of the dilute solutions and thin films of the pyrazole derivatives was studied. PL measurements revealed that highly luminescent (η?=?0.88) cyano-free pyrazole derivative in solution became non-emissive (η?=?0.01) by attaching cyano groups as a result of these groups-induced torsional deactivation. However in the solid state, the steric and electrostatic effects of the bulky and polar cyano groups prevented tight packing of the pyrazole derivative molecules, thus significantly reducing migration-induced quenching of the excitons at the defects. Incorporation of the cyano groups resulted in the two-fold enhancement of the PL quantum yield in the film of the pyrazole derivative as compared to that of the cyano-free film. The Ip of 5.90?eV estimated for the cyano groups-containing compound was found to be higher as compared to the Ip of 5.46?eV for cyano-free analogue, what in conjunction with the PL data for the films indicates increased electron affinity in the pyrazole derivative with additional cyano groups.
Pd-catalyzed cross-coupling reactions of halogenated 1-phenylpyrazol-3-ols and related triflates
Arba?iauskiene, Egle,Vilkauskaite, Gyte,Eller, Gernot A.,Holzer, Wolfgang,?a?kus, Algirdas
scheme or table, p. 7817 - 7824 (2009/12/26)
1-Phenyl-1H-pyrazol-3-ol was used as a versatile synthon for the preparation of various 1-phenyl-1H-pyrazole derivatives substituted at C-3 and C-4 of the pyrazole nucleus and at the phenyl ring para-position. Treatment of 1-phenyl-1H-pyrazol-3-ol with tr
