Photooxidation of 3,5-diaryl-1-phenyl-2-pyrazolines: Experimental and computational studies
Photooxidation of various 2-pyrazolines is studied experimentally and computationally. Experimental results show that the electron-donating/withdrawing substituents increases/decreases the rate of this photoreaction. The proposed light-induced electron-tr
Br?nsted acid-mediated annulations of 1-cyanocyclopropane-1-carboxylates with arylhydrazines: Efficient strategy for the synthesis of 1,3,5-trisubstituted pyrazoles
1-Cyanocyclopropane-1-carboxylates are reacted with arylhydrazines to afford 1,3,5-trisubstituted pyrazoles under the influence of a Br?nsted acid. Formally, this transformation can be regarded as an annulation of three-membered rings with α-carbonyl and
Xue, Shuwen,Liu, Jiaming,Qing, Xushun,Wang, Cunde
p. 67724 - 67728
(2016/08/02)
Visible light catalyzed aromatization of 1,3,5-triaryl-2-pyrazolines by platinum(II) polypyridyl complex under oxidant-free condition
With visible light (λ=450 nm) irradiation of a catalytic amount of platinum(II) terpyridyl complex, 1,3,5-triaryl-2-pyrazolines can be smoothly converted to their corresponding pyrazoles and hydrogen in quantitative yields with no use of any oxidant at ro
Ye, Pan,Wang, Deng-Hui,Chen, Bin,Meng, Qing-Yuan,Tung, Chen-Ho,Wu, Li-Zhu
p. 175 - 179
(2016/02/16)
A convenient and efficient protocol for the synthesis of 5-aryl-1,3-diphenylpyrazole catalyzed by hydrochloric acid under ultrasound irradiation
The synthesis of 5-aryl-1,3-diphenylpyrazole via the reactions of 3-aryl-2,3-epoxy-1-phenyl-1-propanone with phenylhydrazine was carried out in 69-99% yields at room temperature under ultrasound irradiation. This method provides several advantages such as
Li, Ji-Tai,Yin, Ying,Li, Ling,Sun, Ming-Xuan
experimental part
p. 11 - 13
(2010/11/16)
Solvent-free synthesis of 1, 3-diphenyl-5-arylpyrazole derivatives
The synthesis of 1, 3-diphenyl-5-arylpyrazoles via the reactions of 2, 3-epoxy-1-phenyl-3-aryl-1-propanones with phenylhydrazine was carried out in 48-84% yields at 230 °C under solvent-free condition within 1.5 h. This method provides several advantages
Li, Ji-Tai,Yin, Ying,Meng, Xian-Tao
experimental part
p. 384 - 386
(2010/04/23)
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