5895-68-1Relevant academic research and scientific papers
An Adaptable Chelating Diphosphine Ligand for the Stabilization of Palladium and Platinum Carbenes
Barrett, Brittany J.,Iluc, Vlad M.
, p. 730 - 741 (2017/04/21)
Group 10 metal carbenes are proposed in catalytic transformations; however, their isolation remains difficult without the presence of a heteroatom donor. The adaptable cis and trans coordinating ligand PterP (1,2-bis(2-(diisopropylphosphino)phe
Selenobenzophenones and diazoalkanes: Isolation of tetraarylethylenes by the reaction of benzophenone hydrazones with diselenium dibromide
Okuma, Kentaro,Kojima, Kazuki,Oyama, Kosuke,Kubo, Kento,Shioji, Kosei
, p. 820 - 825 (2007/10/03)
The reaction of selenobenzophenones with diazomethane afforded the corresponding diarylethylenes and symmetrical olefins. The reaction with diaryldiazomethanes gave three different types of tetraarylethylenes. This reaction proceeded through 1,3,4-selenadiazoline intermediates, and retrocyclization was observed. The formation of 1,3,4-selendiazolines was independently confirmed by the reaction of benzophenone hydrazones with diselenium dibromide, which afforded tetraarylethylenes in good yields. This method is applicable to the two-step synthesis of tetraarylethylenes from benzophenones. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.
Synthesis of 1, 1, 4, 4-tetraryl-1, 3-diazabutadienes by oxidation of hydrazones using bis(acetylacetonato)copper (II)
Singh,Kopo
, p. 1736 - 1737 (2007/10/03)
The treatment of benzophenone hydrazones with bis(acetylacetonato)copper(II) affords 1, 1, 4, 4-tetraryl-1, 3-diaza-butadienes in good yields. The formation of diazabutadienes is explained by the intermediacy of carbenoids generated by the Cu(acac)2
Carbenerhodium complexes of the half-sandwich-type: Synthesis, substitution, and addition reactions
Werner, Helmut,Schwab, Peter,Bleuel, Elke,Mahr, Norbert,Windmueller, Bettina,Wolf, Justin
, p. 4461 - 4470 (2007/10/03)
A series of carbenerhodium(I) complexes of the general composition [(η5-C5H5)Rh(=CRR′)(L)] (2a-2i) with R = R′ = aryl and L = SbiPr3 or PR3 has been prepared from the square-planar precursors trans-[RhCl(=CRR′)(L)2] and NaC5H5 in excellent yields. Reaction of the triisopropylstibane derivative 2a, which contains a rather labile Rh-Sb bond, with CO, PMe3, and CNR (R = Me, CH2Ph, tBu) leads to the displacement of the SbiPr3 ligand and affords the substitution products [(η5-C5H5)Rh-(=CPh2)(L)]. (3-7). In contrast, treatment of the triisopropylphosphane compound 2c with CO and CNtBu leads to the cleavage of the Rh=CPh2 bond and gives besides [(η5-C5H5)Rh(PiPr3)(L)] (10, 12) by metal-assisted C-C coupling diphenylketene Ph2C=C=O (11) or the corresponding imine Ph2C=C=NtBu (13). While the reaction of 2a, c with C2H4 yields [(η5-C5H5)Rh(C2H4) (L)] (14, 15) and the trisubstituted olefin Ph2C=CHCH3 (16), treatment of 2a, c with RN3 leads to the cleavage of both the Rh-EiPr3 and Rh=CPh2 bonds and gives the chelate complexes [(η5-C5H5)-Rh(κ2-RNNNNR )] (19, 20). The substitution products 3 (L = CO) and 4 (L = PMe3) react with an equimolar amount of sulfur or selenium by addition of the chalcogen to the Rh=CPh2 bond to generate the complexes [(η5-C5H5) Rh-(κ2-ECPh2)(L)] (21-24) with thio- or selenobenzophenone as ligand. Similarly, treatment of 3 with CuCl affords the unusual 1:2 adduct [(η5-C5H5)(CO)Rh-(μ-CPh2) (CuCl)2] (25), which reacts with NaC5H5 to form [(η5-C5H5)(CO)Rh(μ-CPh2)Cu (η5-C5H5)] (26). The molecular structures of 3 and 22 have been determined by X-ray crystallography.
Electrochemical Oxidation of Benzophenone Hydrazones
Chiba, Toshiro,Okimoto, Mitsuhiro,Nagai, Hiroshi,Takata, Yoshiyuki
, p. 2968 - 2972 (2007/10/02)
The anodic oxidation of benzophenone hydrazones (1) was found to give several products, depending upon the electrolysis conditions employed such as electrode material, temperature, and electrolyte composition.For example, the oxidation using a platinum anode at room temperature in LiClO4-MeCN afforded exclusively benzophenone azines (2), whereas in NaOMe-MeOH benzophenone dimethyl acetals (3) were formed as the main products.On the other hand, the oxidation using a graphite anode in refluxing MeOH containing NaOMe gave diphenylmethyl methyl ethers (4), along with diphenylmethanes (5).When the analogous electrolysis was conducted in the presence of methacrylic acid derivatives, corresponding diphenylcyclopropanes (7) were obtained in relatively high yields.
REGIOSELECTIVE MONOALKYLATION OF THE VICINAL cis-DIOL GROUP IN MANNOPYRANOSIDES USING DIARYLDIAZOALKANES-TIN(II) CHLORIDE
Petursson, Sigthor,wEbber, John M.
, p. 41 - 52 (2007/10/02)
Highly regioselective monoalkylations of the cis-2,3-diol group in mannopyranosides can be achieved with diaryldiazoalkanes in the presence of catalytic amounts of tin(II) chloride.With diazo(diphenyl)methane (1), its 4,4'-dimethyl (2) and 4,4'-dichloro (
