Die Selivanov‐Probe auf Fructose

The Seliwanoff's test is a useful tool in biochemistry and food chemistry as test for fructose and other hexoketoses. This article depicts the life and work of Russian chemist named F. F. Selivanov, who was born in aristocratic family, was affected by revolutionary Narodniki movement, and attended the universities in Russia, Switzerland and Germany. His life is a good example of connections between Russian and German agrochemical centres in XIX century. His major achievements are the test for fructose and the first synthesis of N‐Bromosuccinimide. He is also known as a doctoral supervisor of A.E. Arbuzov, the discoverer of Michaelis‐Arbuzov reaction.     

Chelatliganden auf Basis peralkylierter Bis‐ und Tris‐Guanidine

Chelat Ligands Based on Peralkyl Bis‐ and Tris‐Guanidines By reaction of bi‐ and trifunctional primary alkyl amines with the chlor amidinium salt [(Me₂N)₂C–Cl]Cl amine functionalities are transformed into more basic peralkyl guanidine functionalities. This synthetic strategy is used in the synthesis of new peralkyl bis‐ and tris‐guanidines 1 a and 2 – 4 . The ligand 1,1,1‐tris[2N‐(1,1,3,3‐tetramethylguanidino)methyl]ethane ( 4 ), reacts with ZnCl₂ und MnCl₂ to yield neutral 1 : 1 complexes 5 and 6 with one non‐coordinating dangling guanidine functionality and a tetrahedrally coordinated metal atom. The crystal structure analysis of the hydrochloride 1 b of octamethyl bis guanidine 1,2di[2N‐(1,1,3,3‐tetramethylguanidino)]ethane ( 1 a ) as well as the one of the zinc complex 5 are reported.