A novel and convenient synthesis towards 2-pyridylselenium compounds: X-ray crystal structure of 4,4′-dimethyl-2,2′-dipyridyl diselenide and tris(2-pyridylseleno)methane
作者:K.K Bhasin、Jaspreet Singh
DOI:10.1016/s0022-328x(02)01627-3
日期:2002.9
hydrazine hydrate in sodium hydroxide reacts in situ with 2-bromopyridines to afford the title compounds in good to excellent yields. Hydrazine hydrate readily cleaves the selenium-selenium bond in these diselenides to generate 2-pyridylselenolate anion, which reacts with halomethanes to afford 2-pyridylseleno methanes. X-ray crystalstructure of 4,4′-dimethyl-2,2′-dipyridyl diselenide (4) and tris(2-pyridylseleno)methane
Bis(2-pyridyl)diselenoethers as versatile ligands for copper-catalyzed C–S bond formation in glycerol
作者:Roberta Cargnelutti、Ernesto S. Lang、Ricardo F. Schumacher
DOI:10.1016/j.tetlet.2015.07.060
日期:2015.9
In this Letter, we describe a simple and efficient general methodology for CuI/bis(2-pyridyl)diselenoether-catalyzed C-S coupling reactions of aryl halides with thiols using glycerol as an environmentally friendly solvent. The products were obtained in moderate to excellent yields. The performance of CuI/L3-catalyzed C-S coupling reactions in glycerol is comparable to the related cross-coupling reactions in common organic solvents using transition-metal salts as catalyst. The use of the system CuI/L3/glycerol related in this work offers the possibility of performing the reaction in the absence of toxic organic solvents, expensive metals and using ultrasound as an alternative energy source. (C) 2015 Elsevier Ltd. All rights reserved.
Gold(I) phosphine complexes with bis(2-pyridyl)diselenoether: Synthesis and structure elucidation
作者:Roberta Cargnelutti、Felipe D. da Silva、Rodrigo Cervo、Ricardo F. Schumacher、Ernesto S. Lang
DOI:10.1016/j.inoche.2017.05.002
日期:2017.7
with Ph3PAuCl and [(dpph)(AuCl)2] dpph = 1,6-bis(diphenylphosphino)hexane to produce the respective complexes [(L)Au2(PPh3)2](PF6)2 (1) and [(L)(dpph)Au2(PF6)2]n (2). These complexes were isolated in crystalline form and studied using spectroscopic and X-ray diffraction techniques. The coordination of the ligand (2-PySe)2(CH2) (L) to the gold(I) metal centers in complexes [(L)Au2(PPh3)2](PF6)2 (1)