983-80-2Relevant articles and documents
Sequential Addition of Phosphine to Alkynes for the Selective Synthesis of 1,2-Diphosphinoethanes under Catalysis. Well-Defined NHC-Copper Phosphides vs in Situ CuCl2/NHC Catalyst
Yuan, Jia,Zhu, Lizhao,Zhang, Jianying,Li, Jianfeng,Cui, Chunming
supporting information, p. 455 - 459 (2017/04/26)
The well-defined NHC-copper phosphides [(NHC)CuPPh2]3 (1, NHC = 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (IiPr); 2, NHC = N,N-di-tert-butylimidazol-2-ylidene (ItBu)) have been prepared by the reaction of simple copper halides with HPPh2 in the presence of N-heterocyclic carbenes (NHCs). Complexes 1 and 2 enabled catalytic double hydrophosphination of alkyl and aryl terminal alkynes to yield 1,2-diphosphinoethanes selectively in good yields. On the basis of these results, the most efficient and pratical in situ CuCl2/NHC catalyst has been developed. It catalyzes the selective double hydrophosphination of the alkynes with high efficiency and a wide substrate scope and exhibits even better performance than the well-defined NHC-Cu phosphides. The mechanistic studies disclosed that the formation of a copper acetylide in the catalytic cycle played an important role in the acceleration of the catalytic process.
Diphosphine compounds: Part I. Novel biologically active 1,1′bis-and/or 1,2-cis-(diphenylphosphino-)ethene and their complexes [M(CO)n{Ph2P(CHn)nPPh2}] & [Cu(Cl)2{Ph2P(CHn)nPPh 2}], (M = W, Mo, Crn = 1,2...n)
Awad, Ibrahim M. A.,Hassan, Fatma S. M.,Mohamed, Adila E.,Al-Hossainy, Ahmed F.
, p. 1251 - 1266 (2007/10/03)
Interaction of [Ph2PC(=CH2)PPh2] (A) 1-3 and/or [Ph2P (CH=CH) PPh2](B) ligands in different molar ratio with hexacarbonyl metals M(CO)6 gives [M(CO)nPh2PC(=CH2)PPh2] and/or [M(CO)nPh2P (CH=CH)PPh2 where M=Cr, Mo or W, n = 2 and/or 4]. The carbon diphosphine complexes of type (A) which form four heteromemebered rings and/or type (B) form five heteromembered rings which reacts (addition reaction) with some different amines (methyl arnine, dimethyl anime), phenyl hydrazine and/or some of amino acids (glycine, alanine, aspartic acid, serene). The structures of A and/or B complexes and their amino derivatives have been characterized by using elemental analysis, IR spectra, 1HNMR,1H-{31P}-NMR, and mass spectra. Ligands and their complexes were screened in vitro to investigate the biological activities (antibacterial and antifungi). Interestingly, complexes are having strong and remarkable activities increases than the free ligands.
ACETYLENIC HYDROCARBONS AND VINYL HALIDES IN THE ALKYLATION OF PH ACIDS UNDER CONDITIONS OF PHASE-TRANSFER CATALYSIS OR IN SUPERBASIC MEDIUM
Khachatryan, R. A.,Grigoryan, N. Yu.,Indzhikyan, M. G.
, p. 1134 - 1138 (2007/10/02)
By the reaction of nonactivated acetylenes with diphenylphosphine under phase-transfer catalysis or in superbasic medium the corresponding mono- and diphosphines were obtained, whereas with diphenylphosphine oxide only bis(phosphine oxides) were formed.Diphenylphosphine was found to react with 1,1- and 1,2-dichloroethenes, as well as with 1,1,2-trichloroethane, yielding 1,2-bis(diphenylphosphino)ethene.The reactions of E-1-chloro-2-phenyl- and 1-chloro-1-phenylethenes with diphenylphosphine under similar conditions lead either to E-1-diphenylphosphino-2-phenylethene or to bisphosphine with a ratio of reactants of 1:1 or 1:2 respectively.Diphenylphosphine oxide gives bis(phosphine oxides) in all the above cases.Stereochemistry and mechanism of the reactions are discussed.
COMPLEXES ACETYLENIQUES DE TITANE(II). REACTIVITE VIS-A-VIS DE L'HYDROGENE MOLECULAIRE: UNE NOUVELLE APPROCHE DU TITANOCENE
Demerseman, Bernard,Coupanec, Pascale Le,Dixneuf, Pierre H.
, p. C35 - C38 (2007/10/02)
Electron-rich alkynetitanium(II) complexes Cp2Ti(PhCCPh)(PMe3), (MeCp)2Ti(PhCCPh)(PMe3) and Cp(C5Me5)Ti(PhCCPh) react with molecular hydrogen and are catalyst precursors for the hydrogenation of alkynes.Selective hydrogenation leading to cis-olefins takes place in the presence of an excess of PMe3 under mild conditions (1 atm H2).
