26496-20-8Relevant articles and documents
STUDY OF THE TELOMERIZATION OF ETHYLENE AND 1-HEXENE BY BUTANAL THROUGH COMPARATIVE KINETICS
Orlova, S. V.,Ikonnikov, N. S.,Terent'ev, A. B.
, p. 1222 - 1225 (1990)
The reaction of ethylene and 1-hexene with butanal was studied using tertiary butyl peroxide initiation at 140 deg C and a hydrostatic pressure in the range of 250-450 kg/cm2.Based on calculated values of the rate constant ratios for the addition reaction of the n-C3H7CO radical to ethylene (k0e) and 1-hexene (k0h), we obtained k0e/l0h = 3.7 as the rate constant of the decarbonylation reaction of this radical (kd).The partial chain transfer constants were calculated for the ethylene-butanal system as Cn: C1 = 1.0 +/- 0.16; C2 = 1.0 +/- 0.14; C3 = 0.9 +/- 0.23.The results obtained indicate the nucleophilic character of the n-C3H7CO radical in these reactions.
A General Approach to Intermolecular Olefin Hydroacylation through Light-Induced HAT Initiation: An Efficient Synthesis of Long-Chain Aliphatic Ketones and Functionalized Fatty Acids
Guin, Joyram,Paul, Subhasis
supporting information, p. 4412 - 4419 (2021/02/05)
Herein, an operationally simple, environmentally benign and effective method for intermolecular radical hydroacylation of unactivated substrates by employing photo-induced hydrogen atom transfer (HAT) initiation is described. The use of commercially available and inexpensive photoinitiators (Ph2CO and NHPI) makes the process attractive. The olefin hydroacylation protocol applies to a wide array of substrates bearing numerous functional groups and many complex structural units. The reaction proves to be scalable (up to 5 g). Different functionalized fatty acids, petrochemicals and naturally occurring alkanes can be synthesized with this protocol. A radical chain mechanism is implicated in the process.
A new organo-ruthenium substituted tungstotellurate: Synthesis, structural characterization and catalytic properties
Zheng, Da-Ming,Wang, Rui-Qiang,Du, Yu,Hou, Guang-Feng,Wu, Li-Xin,Bi, Li-Hua
, p. 8829 - 8836 (2016/10/11)
Reaction of [RuC6H6Cl2]2 with TeO2 and Na2WO4·2H2O in aqueous solution (pH 4.7) yielded a novel organo-ruthenium supported tungstotellurate polyanion, [Te2W20O70(RuC6H6)2]8- (Ru-1), which is composed of two [RuC6H6]2+ units linked to a [Te2W20O70]12- fragment through Ru-O(W) bonds resulting in an assembly with idealized C2h symmetry. Furthermore, the polyanion Ru-1 was anchored on 3-aminopropyltriethoxysilane (apts)-modified SBA-15 to prepare new catalysts (SBA-15-apts-Ru-1) containing different amounts of Ru-1, which were characterized using powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N2-adsorption measurement and Fourier transform infrared reflectance (FT-IR) spectroscopy. Finally, the catalytic activity of SBA-15-apts-Ru-1 was evaluated for the aerobic oxidation of n-tetradecane using air as the oxidant in the absence of any additives or solvents. In addition, the optimum catalytic reaction conditions were also determined.
Hyperfine Structures of Doxyl-Labeled n-Alkyl Chains by NMR and EPR
Bales, Barney L.,Mareno, Donna,Harris, Francis L.
, p. 37 - 53 (2007/10/02)
The proton hyperfine coupling constants in a series of n-alkyl chains with a doxyl group attached at various points from the end of the chain have been measured by NMR and EPR spectroscopies.The hyperfine structure shows no further change when the attachment point is four or more carbon-carbon bonds from the end of the chain.The high resolution afforded by 500 MHz NMR reveals small magnetic inequivalencies in the chain methylene hyperfine coupling constants located at the same distance from the attachment point.Protons in the same chain methylene group are shown to have different hyperfine coupling constants while protons on different chain methylene groups, symmetrically placed with respect to attachment point, are the same, in every case except one.EPR spectra simulated from hyperfine coupling constants derived from NMR are in excellent agreement with experiment.Inhomogeneous EPR line broadening is found to be in excellent agreement with a previously derived universal hyperfine pattern (B.L.Bales, in "Biological Magnetic Resonance" (L.J.Berliner and J.Reuben, Eds.), Vol. 8, p. 77, Plenum, New York, 1989), so no new correction procedures are necessary.Strategies for selectively deuterating n-alkyl spin probes are developed and compared with some results taken from the literature.Deuterating the chain methylene groups two to three carbon-carbon bonds from the attachment point is necessary for the maximum gain in resolution and sensitivity.
Vinylic Organoboranes. 6. A General Synthesis of (E)-Disubstituted Alkenes or Ketones via the (E)-(1-Substituted-1-alkenyl)boronic Esters
Brown, Herbert C.,Basavaiah, D.,Kulkarni, Surendra U.,Lee, Hsiupu D.,Negishi, Ei-ichi,Katz, Jean-Jacques
, p. 5270 - 5276 (2007/10/02)
Development of a general stereospecific synthesis of (E)-disubstituted alkenes utilizing a variety of hydroborating agents such as monohaloborane, thexylborane, thexylchloroborane, and dibromoborane is discussed.Hydroboration of 1-halo-1-alkynes with dial
