Related Experiment Video
Updated: Jun 28, 2026
![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)
Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Comparative study of analytical properties and applications of picolinaldehyde thiosemicarbazone and
Abstract:
The analytical properties of picolinaldehyde thiosemicarbazone and selenosemicarbazone have been studied, in order to investigate the changes produced when the Se atom is substituted for the S atom. The ionization constants of both substances are very similar. The complexes of picolinaldehyde selenosemicarbazone with cations in aqueous solution are less stable, and the absorption spectra show bathochromic and hypochromic shifts. The introduction of the Se atom offers no advantages in the analytical application of these compounds.
Related Concept Videos
Preparation and Reactions of Sulfides
Structure and Nomenclature of Thiols and Sulfides
Preparation of Diols and Pinacol Rearrangement
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview
UV–Vis Spectroscopy: Woodward–Fieser Rules
Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones
In the presence of multiple functional groups, when selective reduction of one group over the other is desired, groups like aldehydes and ketones that form acetals...

