82296-86-4Relevant academic research and scientific papers
PHOSPHINE-NICKEL(II), -COBALT(II), -PALLADIUM(0) AND -PALLADIUM(II) COMPLEXES AS CATALYSTS IN CROSS-COUPLING REACTIONS OF ARYL- AND ALKYL-GRIGNARD REAGENTS WITH ORGANIC TELLURIDES
Uemura, Sakae,Fukuzawa, Shin-Ichi,Patil, Suresh R.
, p. 9 - 18 (1983)
Some alkyl- and aryl-tellurides react with Grignard reagents (RMgBr; R = aryl and alkyl) in the presence of NiCl2(PPh3)2, NiCl2(Ph2PCH2CH2CH2PPh2), or CoCl2(PPh3)2 as catalyst in THF or diethyl ether as solvent to give the cross-coupling products together with the homo-coupling products of the tellurides in good to moderate yields, with elemental tellurium being formed as a black precipitate.A catalytic reduction-oxidation cycle involving a Ni or Co complex bearing an organotellurium moiety (RTe; R = alkenyl, aryl, and alkyl) is proposed for the reaction.Palladium catalysts such as Pd(PPh3)4, PdCl2(PPh3)2, and PdCl2(PhCN)2 are revealed to be much less effective than the Ni and Co catalysts in both the yield and the stereoselectivity of the product.
Cerium(III)-mediated efficient and steroselective hydrochalcogenation of terminal alkynes
Silveira, Claudio C.,Mendes, Samuel R.,Rosa, Daniel D.,Zeni, Gilson
experimental part, p. 4015 - 4021 (2010/03/24)
Vinylic chalcogenides were synthesized stereospecifically by hydrochalcogenation of propargylic amines or alcohols mediated by cerium(III) chloride. The products were obtained in good yields and with high regio- and stereoselectivities. Georg Thieme Verla
Addition of chalcogenolate anions to terminal alkynes using microwave and solvent-free conditions: Easy access to bis-organochalcogen alkenes
Perin, Gelson,Jacob, Raquel G.,Dutra, Luiz G.,De Azambuja, Francisco,Dos Santos, Greice F. F.,Lenard?o, Eder J.
, p. 935 - 938 (2007/10/03)
We present here the reaction of diphenyl dichalcogenides (Se and Te) with propargyl alcohols using alumina supported sodium borohydride under solvent-free conditions. This efficient and improved method is general and furnishes the corresponding vinyl chal
5H-1,2-OXATELLUROLES AND THEIR BENZO ANALOGS: SYNTHESIS AND REACTIONS
Sadekov, I. D.,Maksimenko, A. A.,Zakharov, A. V.,Rivkin, B. B.
, p. 243 - 254 (2007/10/02)
Tetracoordinated derivatives of 2-halo-2-aryl-5H-1,2-oxatelluroles and 1-halo-1-butyl-3H-benz-2,1-oxatelluroles were synthesized by the oxidation of 3-aryltelluro-2-propen-1-ols and the dehydrogenation of 2-butyldihalotellurobenzyl alcohols.The halogen at
Ni(II)- AND Co(II)-PHOSPHINE COMPLEX CATALYZED CARBON-CARBON BOND FORMATION BETWEEN ORGANIC TELLURIDES AND GRIGNARD REAGENTS
Uemura, Sakae,Fukuzawa, Shin-ichi
, p. 1181 - 1184 (2007/10/02)
Treatment of alkenyl and aryl tellurides with Grignard reagents in the presence of NiCl2(PPh3)2, NiCl2(Ph2PCH2CH2CH2PPh2), or CoCl2(PPh3)2 as catalyst affords the cross-coupling products together with the homo-coupling products of the tellurides in good to moderate yields under mild conditions.
