Synthesis of Aryloxy-Substituted 1,2,5-Thiadiazoles by the Ullmann Reaction

3-Aryloxy-1,2,5-thiadiazoles were synthesized by the Ullmann reaction either from 3-chloro-1,2,5- thiadiazoles and phenols having donor substituents or from 3-hydroxy-1,2,5-thiadiazoles and chlorobenzenes containing acceptor substituents.     

A Comparative Study of the Cyclic Chlorophosphites with C2-Symmetrical Organic Fragments as the Reagents for Enantiomeric Composition Control of the Chiral Alcholos

Abstract

The ³¹P NMR method is intensively used for enantiomeric composition control during the last years [1]. Among all other derivatizing agents the C₂-symmetrical ones have some advantages.