590-86-3Relevant articles and documents
Effective oxidation of alcohols with H5IO6 catalyzed by nickel(II) schiff base complexes
Ramakrishna, Dileep,Bhat, Badekai Ramachandra
, p. 516 - 520 (2010)
Nickel(II)-Schiff base-triphenylphosphine complexes catalyze oxidation of alcohols to carbonyls in presence of minimum amount of periodic acid. The catalytic oxidation was developed in mild conditions and showed good yields. The effects of temperature, time, and concentrations of catalyst and co-oxidant were studied. Higher catalytic activity has been observed for NiL1 compared to the other complexes.Copyright Taylor & Francis Group, LLC.
Effect of CTAB micelle on the oxidation of L-Leucine by N-Bromophthalimide: A kinetic study
Katre, Yokraj,Goyal, Namita,Kumar Singh, Ajaya
, p. 107 - 124 (2011)
The effect of cationic surfactant cetyltrimethylammonium bromide (CTAB) on the oxidation of L-leucine by N-bromophthalimide (NBP) has been studied at 308 K. The reaction exhibits first order dependence on NBP and L-leucine and negative and fractional order dependence on HClO4. The effects of KCl, KBr, phthalimide and mercuric acetate have also been studied and summarized. The rate of reaction increased with an increase in dielectric constant of the medium. CTAB strongly catalyzes the reaction and typical k obs and CTAB profile was observed, i.e., with a progressive increase in CTAB, the reaction rate increased and after achieving a peak kobs decreased at higher concentrations of CTAB. The results are treated quantitatively in terms of "Piszkiewicz" and "Raghvan and Srinivasan's" models. The various activation parameters in presence and absence of CTAB have been also evaluated. A suitable mechanism consistent with the experimental findings has been proposed. The rate constant in micellar phase kM, cooperativity index (n), binding constant (K1 and K2) have been computed. by Oldenbourg Wissenschaftsverlag, Mu?nchen.
Mixed anionic-nonionic micelle catalysed oxidation of aliphatic alcohol in aqueous medium
Acharjee, Animesh,Ali, Md. Ansar,Chowdhury, Suman,Rakshit, Atanu,Saha, Bidyut,Singh, Bula
, (2020)
Oxidation of isoamyl alcohol was carried out under pseudo 1st order reaction condition in aqueous medium by chromic acid. In addition to single micelle, mixed anionic-nonionic micelle (SDS-TX 100) was found to be effective catalyst. Promoters in presence of micelle catalyst showed almost million fold rate acceleration. The product was confirmed by IR and NMR study. UV and NMR analysis were carried out to establish the formation of mixed micelle. Formation of active oxidant was confirmed by fluorescence measurement. Interactions between surfactant and substrate were analysed by NMR spectra. In addition to SDS catalysed Bpy promoted reaction combination of mixed micelle with Bpy promoter was found to show higher rate of oxidation. For single micelle catalysed path the observed rate constants follow the order kobs (SDS) > kobs (TX 100) and kobs (Phen) > kobs (Bpy) > kobs (PA) was observed for promoted reactions. In SDS micelle and mixed micelle kobs (Bpy) > kobs (Phen) > kobs (PA) was observed while in TX 100 micelle kobs (Phen) > kobs (Bpy) > kobs (PA) was found.
Catalytic oxidation of alcohols by nickel(II) Schiff base complexes containing triphenylphosphine in ionic liquid: An attempt towards green oxidation process
Ramakrishna, Dileep,Bhat, Badekai Ramachandra,Karvembu, Ramasamy
, p. 498 - 501 (2010)
A series of square planar nickel(II) complexes containing N,O donor Schiff base ligand, i.e. N-(2-pyridyl)-N′-(5-substituted-salicylidene)hydrazine and triphenylphosphine, have been synthesized and characterized by analytical and spectral methods. Catalytic activities of all the complexes have been studied for the oxidation of alcohols in ionic liquid media using NaOCl as oxidant.
Effective oxidation of alcohols by Iron(III)-Schiff base-triphenylphosphine complexes
Rani, Sandya,Bhat, Badekai Ramachandra
, p. 6403 - 6405 (2010)
Iron(III)-Schiff base-triphenylphosphine complexes catalyze the oxidation of alcohols to their corresponding carbonyl compounds in presence of hydrogen peroxide in good yields.
Isobutene hydroformylation in catalytic systems based on rhodium compounds and polyelectrolytes
Sharikova,Kolesnichenko,Markova,Slivinskii
, p. 701 - 703 (1999)
The catalytic properties of water-soluble systems based on rhodium complexes and polyelectrolytes in isobutene hydroformylation were studied. All of the catalytic systems exhibited an unexpectedly high activity under the conditions where homogeneous hydroformylation virtually did not occur in the presence of conventional rhodium catalysts. A stable catalytic system based on acacRh(CO)2 - PEG complex was proposed, allowing isobutene hydroformylation to be performed with a high activity under mild conditions.
Hydroformylation of olefins in the presence of rhodium carbonyl catalysts immobilized on polymeric pyrrolidinopyridines
Terekhova,Kolesnichenko,Alieva,Markova,Trukhmanova,Slivinsky,Plate
, p. 1583 - 1585 (1996)
The hydroformylation of olefins in the presence of catalytic systems based on RhCl3 and polymeric pyrrolidinopyridines was studied. It was shown that the catalytic system has high activity in the hydroformylation of isobutylene under conditions when the activity of conventional homogeneous catalysts is low. The polymeric catalysts are also thermostable. The effect of solvents on the catalytic properties of the system was studied.
Purification and characterization of isoamyl alcohol oxidase ("Mureka"-forming enzyme)
Yamashita, Nobuo,Motoyoshi, Toru,Nishimura, Akira
, p. 1216 - 1222 (1999)
Isoamyl alcohol oxidase (IAAOD) was purified to apparent homogeneity on SDS-PAGE from ultrafiltration (UF) concentrated sake. IAAOD was a glycoprotein, a monomeric protein with an apparent molecular mass of 73 and 87 kDa, by SDS-PAGE and gel filtration on HPLC, respectively. IAAOD showed high substrate specificity toward C5 branched-chain alkyl alcohol (isoamyl alcohol), and no activity toward shorter (C1-C4) or longer (C7-C10) alkyl alcohols tested. IAAOD was stable between pH 3.0-6.0 at 25°C. The optimum pH was 4.5 at 35°C. Heavy metal ions, p-chloromercuribenzoate (PCMB), hydrazine, and hydroxylamine strongly inhibited the enzyme activity, and an anti-oxidant like L-ascorbate did also. Isovaleraldehyde was produced markedly in pasteurized sake by adding purified IAAOD, therefore, we concluded that it was the enzyme that causes formation of mureka, an off-flavor of sake, the main component of which is isovaleraldehyde.
Aerobic oxidation of alcohols with ruthenium catalysts in ionic liquids
Wolfson, Adi,Wuyts, Stijn,De Vos, Dirk E.,Vankelecom, Ivo F.J.,Jacobs, Pierre A.
, p. 8107 - 8110 (2002)
The aerobic oxidations of aliphatic and aromatic alcohols into the corresponding aldehydes and ketones have been efficiently performed with several ruthenium catalysts in various ammonium salts under low oxygen pressure and without any co-catalyst.
Mechanistic study of [RuCl3(H2O)2OH]- catalyzed oxidation of L-leucine by acidic N-bromophthalimide
Jain, Bhawana,Singh, Ajaya Kumar,Negi, Reena
, p. 1717 - 1728 (2015)
Kinetic studies in homogenous Ru(III) catalyzed oxidation of L-leucine (Leu), by N-bromophthalimide (NBP) in the presence of perchloric acid have been made at 303 K using mercuric acetate as Br- ion scavenger. The reaction follows first-order kinetics with respect to [NBP]. In the lower concentration range of Leu and Ru(III) chloride, the reaction follows first-order kinetics but tends to zero at higher concentration. A positive effect of [Cl-] was observed in the oxidation of Leu. An increase in the rate of reaction with the decrease in dielectric constant of the medium was observed while negative effect was observed for [H+]. The rate of oxidation is unaffected by the change in [phthalimide (NHP)]. Rate of reaction decreased with increase in ionic strength of the medium. The main oxidation products of the reactions were identified as aldehyde, ammonia and CO2 for the oxidation of Leu. From the effect of temperature (298-318 K) on the reaction rate, various activation parameters have been calculated and on the basis of these parameters, a suitable explanation for the reaction mechanism has been given.
