4-(3-Methyl-5-phenyl-1H-pyrazol-1-yl)benzene­sulfonamide

With respect to the planar five-membered ring of the title compound, C16H15N3O2S, the phenyl ring is aligned at 47.0 (1)° and the phenyl­ene ring at 37.6 (1)°. The amino group has the N atom in a pyramidal geometry; the group is a hydrogen-bond donor to the sulfonyl O atom of one mol­ecule and to the pyrazole N atom of another mol­ecule, resulting in the formation of a layer parallel to the bc plane

<span style="mso-bidi-language:HI">Novel synthesis of heteroarylazopyrazolones and their application as disperse dyes <i><span style="mso-bidi-language:HI">via </span></i><span style="mso-bidi-language: HI">AlCl₃-catalyzed diazocoupling of 1-aryl/heteroaryl-3-methyl-1<i>H</i>-pyrazol-2-in- <span style="mso-bidi-language:HI">5-ones in aqueous medium </span></span></span>

1431-1436AlCl3-catalyzed diazocoupling of 1-aryl/heteroaryl-3-methyl-1H-pyrazol-2-in-5-ones 1 in water with different aryl/heteroaryldiazonium salts affords the corresponding hetcroarylazopyrazoloncs 2 as colored products with high yields. These dyes have been characterized by UV-Vis, FT-IR and 1H NMR spectroscopic techniques and elemental analysis. Cotton, wool, silk and polyesters fabrics have been dyed and their photostability and color fastness identified. </span

Vincamine and 14-epi-vincamine indole alkaloids from Ambelania occidentalis

AbstractTwo indole alkaloids, Vincamine 1 and 14-epi-vincamine 2 were isolated here for the first time from Ambelania occidentalis. The structures of these compounds were elucidated by one and two dimension NMR and MS spectroscopy