Concept
Phosphonium
Publications associées (30)
New reagents to introduce weakly coordinating anions of type Al(ORF)4-: synthesis, structure and characterization of Cs and trityl salts
The facile synthesis of five reagents (Cs+ and Ph3C+ salts) to introduce weakly coordinating anions (WCAs) Al(ORF)4- (ORF: OC(H)(CF3)2; OC(CF3)3) or lithium bridged {(RFO)2Al(m-ORF)2(m-Li)(m-ORF)2Al(ORF)2}- (Ph3C+ salt, ORF: OC(H)(CF3)2) is presented. All ...
2001Synthesis and C-13 NMR study of the triangulo-clusters [Pt-3(mu-CO)(3-n)(mu-SO2)(n)(PR3)(3)] (n=0-3)
Gabor Laurenczy, Raymond Roulet
[Pt-3(mu-CO)(3)(PPh3)(3)] was prepared in high yield by the reaction of [Pt-3(mu-CO)(3)(PPh3)(4)] with H2O2. The carbonyl ligands in [Pt-3(mu-CO)(3)(PR3)(3)] (PR3 = PPh3, PPh(2)Bz, PCy3, P'Pr-3) may be completely replaced by sulfur dioxide to give [Pt-3(mu ...
2000Recent advances in the understanding of the syntheses, structures, bonding and energetics of the homopolyatomic cations of Groups 16 and 17
A review, with over 209 refs., is given on the prepn. and structures of all known salts of the known homopolyat. cations of the chalcogens and halogens. The structures of these cations, many of which are nonclassical and cluster-like, arise from pos. charg ...
2000A new generation of "instant ylides": powder mixtures of phosphonium salts and potassium hydride as storable precursors to Wittig reagents
Mixing a finely pulverized alkyltriphenylphosphonium salt and potassium hydride in 1:1 molar ratio gives a ready-to-use powder the components of which react rapidly when tert-Bu Me ether is added under stirring. When, in general after a few minutes, the ge ...
1996Ylide modeling as the key to a cis-selective synthesis of stilbenes
Stilbene type olefins can be prepd. with cis-stereoselectivities approaching 95:5 if tris(2-methoxymethoxyphenyl)phosphine derived ylides are employed and the reaction is carried out at -75 Deg. Thus, treating phosphonium ylide I with p-MeOC6H4CHO in THF c ...
1990w-Hydroxyalkylphosphonium salts as "instant-ylide" components: extremely convenient and highly cis-selective synthesis of alkenol-type pheromones
(Z)-Me(CH2)mCH:CH(CH2)nOH (m = 3,4, 6-9; n = 5-12) were prepd. in 69-84% yield by treating Me(CH2)nCHO with Ph3P:CH(CH2)nONa, formed in situ by treating mixts. of Ph3P+CH2(CH2)nOH Br- with paraffin- or butadiene-styrene-divinylbenzene copolymer-coated NaNH ...
1985ortho-Lithiation of triphenylphosphonio-methylide and, also, triphenylphosphine oxide
Treating Ph3P+C-H2 with RLi (R = Me, Bu) gave mainly RPh2P+C-H2 via extensive ligand exchange whereas R1Li (R1 = MeEtCH, Me3C) reacts to give o-lithiated Ph2(o-LiC6H4)P+C-H2. Ph3PO is also o-lithiated by PhLi or Me3CLi to give Ph2(o-LiC6H4)P+O-. [on SciFin ...
1984SCOOPY and oxirane reactions: a-lithio-ylides vs. conventional ylides
Ph3P:CH2 reacted with epoxides I (R = H, Me, vinyl; R1 = H, Me) or cyclohexene oxide in the presence of 1.2 equiv LiX (X = Br, iodo, BPh4) to give Ph3P+CH2CH2CRR1OH X- or 83% trans-II. Similarly, Ph3P:CH, I (R = R1 = H) and LiBr gave 68% Ph3P+CHMeCH2CH2OHB ...
1983