123775-85-9Relevant articles and documents
New arylselanylpyrazole-copper catalysts: Highly efficient catalytic system for C–Se and C–S coupling reactions
Coelho, Felipe Lange,Dresch, Lucielle Codeim,Stieler, Rafael,Campo, Leandra Franciscato,Schneider, Paulo Henrique
, p. 19 - 26 (2019/01/04)
We describe herein the use of arylselanylpyrazole–copper complexes as versatile catalysts for C–Se and C–S coupling reactions. The performance of these complexes for C–Se reactions was investigated in chalcogenoacetylene synthesis. The reactions were carried out under mild and aerobic conditions and afforded selanylalkynes bearing a variety of electron-withdrawing and electron-donating groups. The performance of these catalysts for C–S coupling was investigated through the reaction of aryl halides with thiols and products were obtained in moderate to excellent yields. A plausible mechanism for selenoacetylene synthesis is also suggested, and the 77Se NMR results show that these arylselanylpyrazole ligands act as hemilabile ligands. High-resolution mass spectrometry was used to investigate the intermediates and also to corroborate the proposed catalytic cycle.
Chalcogenoacetylenes obtained by indium(III) catalysis: Dual catalytic activation of diorgano dichalcogenides and Csp-H bonds
Rampon, Daniel S.,Giovenardi, Rodrigo,Silva, Tiago L.,Rambo, Raoni S.,Merlo, Aloir A.,Schneider, Paulo H.
experimental part, p. 7066 - 7070 (2012/01/04)
A new approach for the one-pot synthesis of alkynyl chalcogenides, exemplified mainly by selenides, was developed in which dual activation of diorgano dichalcogenides and terminal acetylenes is achieved by using an indium(III) catalyst. The method has adv
