作者:Wan-Sin Loh、Ching Quah、Tze Chia、Hoong-Kun Fun、Majal Sapnakumari、Badiadka Narayana、Balladka Sarojini
DOI:10.3390/molecules18022386
日期:——
Four pyrazole compounds, 3-(4-fluorophenyl)-5-phenyl-4,5-dihydro-1H-pyrazole-1-carbaldehyde (1), 5-(4-bromophenyl)-3-(4-fluorophenyl)-4,5-dihydro-1H-pyrazole-1-carbaldehyde (2), 1-[5-(4-chlorophenyl)-3-(4-fluorophenyl)-4,5-dihydro-1H-pyrazol-1-yl]ethanone (3) and 1-[3-(4-fluorophenyl)-5-phenyl-4,5-dihydro-1H-pyrazol-1-yl]propan-1-one (4), have been prepared by condensing chalcones with hydrazine hydrate in the presence of aliphatic acids, namely formic acid, acetic acid and propionic acid. The structures were characterized by X-ray single crystal structure determination. The dihedral angles formed between the pyrazole and the fluoro-substituted rings are 4.64(7)° in 1, 5.3(4)° in 2 and 4.89(6)° in 3. In 4, the corresponding angles for molecules A and molecules B are 10.53(10)° and 9.78(10)°, respectively.
四种吡唑化合物,3-(4-氟苯基)-5-苯基-4,5-二氢-1H-吡唑-1-甲醛(1)、5-(4-溴苯基)-3-(4-氟苯基)-4 ,5-二氢-1H-吡唑-1-甲醛 (2), 1-[5-(4-氯苯基)-3-(4-氟苯基)-4,5-二氢-1H-吡唑-1-基]乙酮(3) 和 1-[3-(4-氟苯基)-5-苯基-4,5-二氢-1H-吡唑-1-基]丙-1-酮 (4) 是通过查耳酮与肼缩合制备的在脂肪酸,即甲酸、乙酸和丙酸存在下发生水合物。通过X射线单晶结构测定对结构进行了表征。吡唑与氟取代环之间形成的二面角在1中为4.64(7)°,在2中为5.3(4)°,在3中为4.89(6)°。在4中,分子A和分子B对应的角度分别为 10.53(10)° 和 9.78(10)°。