1134-87-8Relevant articles and documents
Direct benzylation of 1,3-dicarbonyl compounds catalyzed by Cs 2.5H0.5PW12O40 in solvent-free conditions
Rafiee, Ezzat,Khodayari, Maryam,Joshaghani, Mohammad
, p. 1533 - 1538 (2011)
Various 1,3-dicarbonyl compounds reacted readily with benzylic alcohols in the presence of Cs2.5H0.5PW12O40 salt to produce 2-benzylic-1,3-dicarbonyl compounds in high yields. It was found that this catalyst could be completely recovered and reused without loss of its catalytic activities and is thus environmentally conscious especially in solvent-free conditions. The use of this method provides improved modification of the direct benzylation of 1,3-carbonyl compounds in terms of low reaction times, solvent-free conditions, usage of a small amount of the catalyst, and a clean reaction profile. Furthermore, the use of this catalyst is feasible because of its easy preparation, its easy handling, its stability, its easy recovery, its reusability, being environmentally green, its excellent activity, and its selectivity.
Benzyl substituted oxidovanadium(IV)pentane-2,4-dionates: Synthesis, structure and drying properties
Charamzová, Iva,Machálková, Aneta,Vinklárek, Jaromír,Císa?ová, Ivana,Honzí?ek, Jan
, p. 243 - 248 (2019)
New catalysts improving drying of alkyd resins were synthetized and characterized by infrared spectroscopy and electron paramagnetic resonance. Their structure was determined by X-ray structure analysis. The catalytic performance of these oxidovanadium(IV)pentane-2,4-dionate complexes bearing benzyl substituents were studied on four different alkyd resins modified with soybean oil. Results obtained from standard mechanical tests revealed high acceleration of autoxidation process resulting in short total dry times. Evaluation of cured films by electron paramagnetic resonance enabled to follow the active oxidovanadium species, which is generated upon drying process.
Efficient metal-catalyzed direct benzylation and allylic alkylation of 2,4-pentanediones
Rueping, Magnus,Nachtsheim, Boris J.,Kuenkel, Alexander
, p. 825 - 828 (2007)
(Chemical Equation Presented) A highly effective metal-catalyzed benzylation and allylic alkylation of 2,4-pentanediones has been developed. This new bismuth-catalyzed direct carbon-carbon bond forming reaction provides the corresponding monoalkylated dicarbonyl compounds in high yields after short reaction times using the lowest amounts of catalyst (1 mol %) and the free alcohol. In addition, a new route to substituted indenes is presented.
Chemiluminescence in decomposition of bridged 1,2,4,5-tetraoxanes catalyzed by ferrocene
Galimov, Dim I.,Gazeeva, Dilara R.,Bulgakov, Ramil G.,Terent'ev, Alexander O.
, p. 371 - 373 (2017)
Chemiluminescence was observed in ferrocene-catalyzed decomposition of bridged 1,2,4,5-tetraoxanes, namely, 2,3,5,6-tetraoxabicyclo[2.2.1]heptanes. The chemi- and photoluminescence spectra revealed the main products and luminescence emitters to be β-diket
Syntheses of 4-Benzyl-3,5-dimethylpyrazolylborato Complexes of Molybdenum and Tungsten Nitrosyls: Molecular Structure of >, a Complex with an 'Inverted' Bowl-like Structure
Jeffery, John C.,Kurek, Stefan S.,McCleverty, Jon A.,Psillakis, Elefteria,Richardson, Rob M.,et al.
, p. 2559 - 2564 (1994)
Reaction of (1-), obtained by reaction of 4-benzyl-3,5-dimethylpyrazole (Hbdmpz) with KBH4, with (M = Mo or W) and p-MeC6H4SO2N(NO)Me afforded >.The molybdenum carbonyl was converted into X(Y)
Oligomerization and Isomerization of Olefins by Catalysts derived from Nickel Complexes of Dithio-β-diketones
Abeywickrema, Ramyani,Bennett, Martin A.,Cavell, Kingsley J.,Kony, Michael,Masters, Anthony F.,Webb, Alison G.
, p. 59 - 68 (1993)
The complexes 1C(S)CR2C(S)R3>2> 1 and 1C(S)CR2C(S)R3>(PL1L2L3)X> 2 (R, L = alkyl, aryl or CF3; X = Cl, Br or I) have been prepared.The complexes 2 can be chemically anchored to polystyrene or silica-alumina supports via pendant phosphine ligands to form the derivatives 3.The species 2 and 3 in combination with a suitable co-catalyst form extremely active catalysts for the oligomerization of ethylene, propylene or butenes.The immobilised systems show no significant signs of leaching after 24 h operation.In general the oligomerization is highly selective to dimers, however, selectivity and catalyst activity are markedly affected by changes in L.Changes in R affect catalyst activity only.
Novel pyrromethene dyes with N-ethyl carbazole at the meso position: a comprehensive photophysical, lasing, photostability and TD-DFT study
Thorat, Kishor G.,Kamble, Priyadarshani,Ray, Alok K.,Sekar, Nagaiyan
, p. 17221 - 17236 (2015)
Two novel BODIPY (pyrromethene, PM) dyes containing N-ethyl carbazole at the meso position are synthesized and their photophysical properties in different solvents and the photochemical stabilities and laser performances in n-heptane are investigated. The n-heptane solution of the dyes was used as a gain medium in a constructed narrow band dye laser, pumped by a Q-switched (10 Hz) frequency-doubled (532 nm) Nd:YAG laser and the results gave enhanced photo stabilities and similar peak efficiencies of the synthesized dyes as compared to parent dye PM567. When substituted at the meso position with N-alkyl carbazole, photostability is found to be increased in comparison to PM567, and also when substituted at 2- and 6-positions with a benzyl group instead of an ethyl group along with N-ethyl carbazole at the meso position, the photo stability is further increased in n-heptane. A comprehensive study on structural, photophysical and electronic properties of dyes by means of DFT and TD-DFT in the solvents of various polarities has revealed remarkable characteristics of the BODIPY chromophore.
Reductive Knoevenagel Condensation with the Zn-AcOH System
Ivanov, Konstantin L.,Melnikov, Mikhail Ya.,Budynina, Ekaterina M.
, p. 1285 - 1291 (2020/11/13)
An efficient gram-scale one-pot approach to 2-substituted malonates and related structures is developed, starting from commercially available aldehydes and active methylene compounds. The technique combines Knoevenagel condensation with the reduction of the C=C bond in the resulting activated alkenes with the Zn-AcOH system. The relative ease with which the C=C bond reduction occurs can be traced to the accepting abilities of the substituents in the intermediate arylidene malonates.
Chemoselective Hydrosilylation of the α,β-Site Double Bond in α,β- And α,β,γ,δ-Unsaturated Ketones Catalyzed by Macrosteric Borane Promoted by Hexafluoro-2-propanol
Zhan, Xiao-Yu,Zhang, Hua,Dong, Yu,Yang, Jian,He, Shuai,Shi, Zhi-Chuan,Tang, Lei,Wang, Ji-Yu
, p. 6578 - 6592 (2020/07/17)
The B(C6F5)3-catalyzed chemoselective hydrosilylation of α,β- and α,β,γ,δ-unsaturated ketones into the corresponding non-symmetric ketones in mild reaction conditions is developed. Nearly 55 substrates including those bearing reducible functional groups such as alkynyl, alkenyl, cyano, and aromatic heterocycles are chemoselectively hydrosilylated in good to excellent yields. Isotope-labeling studies revealed that hexafluoro-2-propanol also served as a hydrogen source in the process.
