2371-13-3Relevant academic research and scientific papers
Allylic C–H acetoxylation of terminal alkenes over TiO2 supported palladium nanoparticles using molecular oxygen as the oxidant
Zhang, Zhenzhong,Wu, Qixun,Hashiguchi, Taishin,Ishida, Tamao,Murayama, Haruno,Tokunaga, Makoto
, p. 18 - 22 (2016/09/02)
A method for synthesizing linear allylic acetates from terminal alkenes over TiO2 supported Pd nanoparticles (NPs) has been developed, in which O2 serves as the sole oxidant. Good catalytic activity was performed when using allylbenzene as a substrate and the catalyst can be reused at least five times without activity losing. The catalytic system has a broad substrate scope including transformation of 1,3-butadiene into 1,4-diacetoxy-2-butene, which is an important industrial intermediate for production of 1,4-butanediol. In contrast to previous reports that the Pd-catalyzed allylic acetoxylation is generally promoted by PdII species, the XAFS measurements suggest that this reaction is catalyzed over Pd0 NPs. Additionally, XPS analysis of the catalyst confirms the interaction between Pd and TiO2, which probably promote the initial catalytic procedure.
Branch-selective allylic C-H carboxylation of terminal alkenes by pd/sox catalyst
Kondo, Hiroki,Yu, Feng,Yamaguchi, Junichiro,Liu, Guosheng,Itami, Kenichiro
supporting information, p. 4212 - 4215 (2014/11/07)
A ligand-controlled branch-selective allylic C-H carboxylation through Pd catalysis is described. The developed catalytic system, which consists of Pd(OAc)2, sulfoxide-oxazoline (sox) as a ligand and benzoquinone as an oxidant, couples terminal alkenes and carboxylic acids to furnish the corresponding branched allylic esters with high regioselectivity.
Synthesis and characterization of oligonuclear Ru, Co and Cu oxidation catalysts
Lee, Bao-Lin,Kaerkaes, Markus D.,Johnston, Eric V.,Inge, Andrew K.,Tran, Lien-Hoa,Xu, Yunhua,Hansson, Oerjan,Zou, Xiaodong,Akermark, Bjoern
experimental part, p. 5462 - 5470 (2011/03/01)
In this work, we report the preparation and crystal structures of three new oligonuclear complexes, Ru2(bbpmp)(μ-OAc)3 (4), [Co2(bbpmp)(μ-OAc)(μ-OMe)](PF6) (5), [Cu 4(Hbbpmp)2(μ-OAc)(H2O)2](OAc)(PF 6)2 (6) {H3bbpmp = 2,6-bis[(2-hydroxybenzyl)- (2-pyridylmethyl)aminomethyl]-4-methyl-phenol (3)}. The structures of the complexes were determined by single-crystal X-ray diffraction. The oxidation states of ruthenium, cobalt and copper in the complexes are +3, +3 and +2, respectively. In 4 and 5, RuIII and CoIII are coordinated to four oxygen and two nitrogen atoms in an octahedral geometry, while in 6, CuII adopts both octahedral (CuN2O4) and square-pyramidal (CuN2O3) geometry. The potential of the three complexes as oxidation catalysts has been investigated. Copyright
C-Allylation of L-Ascorbic acid under Palladium(0) Catalysis
Moreno-Manas, Marcial,Pleixats, Roser,Villarroya, Merce
, p. 4925 - 4928 (2007/10/02)
L-Ascorbic acid (1) is efficiently allylated at C-2 with primary and secondary allylic substrates by using palladium(0) catalysis.Hydrogenation of the resulting allylated compounds 6 affords L-ascorbic acid derivatives with saturated chains at C-2.
Titanocene Induced Regioselective Deoxygenation of 2,3-Epoxy Alcohols: a New Reaction for the Synthesis of Allylic Alcohols
Yadav, J. S.,Shekharam, T.,Gadgil, V. R.
, p. 843 - 844 (2007/10/02)
A new titanium(III) mediated reduction of 2,3-epoxy alcohols to alk-1-en-3-ols is described.
Allylic Oxidation of Olefins by Cobalt(III), Manganese(III), and Cerium(IV) Acetates in Acetic Acid in the Presence of Sodium Bromide
Morimoto, Takashi,Machida, Toshinori,Hirano, Masao,Zhung, Xiumin
, p. 909 - 914 (2007/10/02)
The effect of added sodium bromide on the allylic oxidation of olefins by cobalt(III), manganese(III), and cerium(IV) acetates has been studied.Sodium bromide strongly accelerated the oxidation of cyclohexene by these oxidants to give cyclohex-2-enyl acetate in good yield.Only one product was obtained in the oxidation of cycloalkenes, but two allylic acetates were obtained in the oxidations of methyl-substituted cyclohexenes, which have two kinds of allylic hydrogen.A mechanism involving hydrogen abstraction from allylic sites by bromine radicals is suggested.
Electron-transfer Processes: Metal Salt Catalysed Oxidation of Olefins by Peroxydisulphate
Arnoldi, Claudio,Citterio, Attilio,Minisci, Francesco
, p. 531 - 542 (2007/10/02)
The reaction of simple olefins (oct-1-ene, oct-2-ene, cyclohexene, cycloheptene) with peroxydisulphate has been investigated under several conditions: (i) in aqueous medium and catalysis by AgI, FeII, and CuII; (ii) in acetic madium and catalysis by CuII, FeIII; (iii) in the presence of traps of nucleophilic alkyl radicals (protonated heteroaromatic bases and 1,4-benzoquinone either in water or in acetic acid).The catalyst and the radical trap govern the selectivity and allow a variety of new synthetic achievements.Evidence for a unified initial mechanism of electron transfer with formation of a radical cation from the olefin is reported to explain all the results.In water the radical cation gives a β-hydroxyalkyl radical, which, depending on the nature of the catalyst and the trap, can give the corresponding saturated alcohol by hydrogen abstraction, the products of CuII oxidation, or β-hydroxyalkylation of the heteroaromatic compound or 1,4-benzoquinone.In acetic acid the radical cation gives a β-acetoxyalkyl radical, which is oxidized to the corresponding allylic acetate by copper(II) acetate or trapped by the heteroaromatic base.
Oxidation by Cobalt(III) Acetate. Part 3. Allylic Oxidation of Various Olefins in Acetic Acid
Hirano, Masao,Nakamura, Kouji,Morimoto, Takashi
, p. 817 - 820 (2007/10/02)
Allylic oxidation of various olefins with cobalt(III) acetate in acetic acid under nitrogen has been investigated.The substrates studied include allylbenzene, oct-1-and -trans-4-ene, cycloalkenes (C5-C8), and 1-and 4-methyl-cyclohexene.The reaction gave exclusively the allylic acetate as the primary product; no 1,2-addition or skeletal rearrangement product was formed in significant amount.Some mechanistic aspects of allylic oxidation are discussed.
