54583-22-1Relevant academic research and scientific papers
Complexes of cis-dioxomolybdenum(VI) with a chiral tetradentate tripodal-like ligand system: Syntheses, structures and catalytic activities
Ghosh, Sabari,Kurapati, Sathish Kumar,Pal, Samudranil
, p. 26 - 33 (2017/03/07)
Racemic complexes with the general formula cis-[MoO2(bzacLn)] (1–4) (H2bzacLn?=?2-((4/5-R-2-hydroxyphenylamino)(pyridin-2-yl)methyl)-1-phenylbutane-1,3-dione, where n?=?1–4 for R?=?H, 5-Me, 5-Cl and 4-Me, respectively and 2Hs represent the dissociable phenolic proton and the active tertiary CH proton) have been synthesized in 75–82% yields by reacting [MoO2(bzac)2] (Hbzac?=?benzoylacetone) with the potentially N2O-donor 5,5-membered fused chelate rings forming Schiff bases 4/5-R-2-(2-pyridylaldimine)phenols (HLn; n?=?1–4 for R?=?H, 4-Me, 4-Cl and 5-Me, respectively) in hot methanol. The chiral ligand system (bzacLn)2?in 1–4 is formed via metal assisted Mannich-type addition of benzoylacetonate methine to the azomethine fragment of HLn. All four complexes have been characterized by elemental (CHN) analysis, solution conductivity, magnetic susceptibility, spectroscopic (IR, UV–Vis and NMR) and electrochemical measurements. The molecular structures of 1–3 have been established by single crystal X-ray crystallography. In each complex, the chiral (bzacLn)2?acts as a tetradentate, N2O2-donor, tripodal-like ligand system and along with the two mutually cis oxo groups forms a distorted octahedral N2O4coordination environment around the molybdenum(VI) center. All four complexes are diamagnetic and non-electrolytic. The infrared spectra are generally consistent with the structural formulas of 1–4. The electronic spectra of 1–4 in dimethylformamide display two strong absorption bands in the range 245–300?nm. The cyclic voltammograms of 1–4 in dimethylformamide exhibit a metal centered one-electron reduction response within ?0.64 to ?0.74?V. All these complexes (1–4) and the analogous cis-[MoO2(acacL1–4)] (5–8) synthesized from [MoO2(acac)2] (Hacac?=?acetylacetone) and HL1–4have been evaluated for their bromoperoxidase activities.
Comparative study of the vicinal functionalization of olefins with 2:1 bromide/bromate and iodide/iodate reagents
Agrawal, Manoj K.,Adimurthy, Subbarayappa,Ganguly, Bishwajit,Ghosh, Pushpito K.
experimental part, p. 2791 - 2797 (2009/08/08)
A comparative evaluation was made on the syntheses of vicinal halohydrins, halo methyl ethers, and halo acetates from olefins using 2:1 Br-/BrO3- and I-/IO3- reagents. In many cases both reagents afforded products selectively in high yields. The highest halogen atom efficiencies attained were 97% and 93% for Br-/BrO3- and I-/IO3-, respectively. Of the two reagents, I-/IO3- was established to be the preferred reagent for vicinal functionalization of linear alkenes and also for halo acetate preparation. However, only Br-/BrO3- was effective for vicinal functionalization of trans-stilbene and chalcones.
Conversion of alkyl halides into the corresponding alcohols under mild reaction conditions
Ruddick, Clare L.,Hodge, Philip,Houghton, Mark P.
, p. 1359 - 1362 (2007/10/03)
Reaction of primary, cyclopentyl, allyl and arylmethyl halides, but not an acyclic secondary halide or a tertiary halide, in acetone or tetrahydrofuran with the formate form of a commercial anion exchange resin gave formate esters in good yields. The formates were hydrolysed efficiently to the corresponding alcohols by a brief treatment with hydrochloric acid. Reaction of primary alkyl bromides or iodides, secondary alkyl bromides, cinnamyl and arylmethyl halides in tetrahydropyran or 1,4-dioxane with the bicarbonate form of the same anion-exchange resin gave the corresponding alcohols directly in good yields. This latter reaction can be carried out successfully in the presence of ester or amide groups.
Solvation and Steric Effects on Electrophilic Reactivity of Ethylenic Compounds. Part 4. Bromination of Oct-1-ene in Anionic Microemulsions
Ruasse, Marie-Francoise,Blagoeva, Iva B.,Krys, Sophie,Sebastian-Gambaro, Maria-Angela
, p. 1283 - 1289 (2007/10/02)
The kinetics and product distribution of the bromination of oct-1-ene in anionic sodium dodecylsulfate (SDS)-butanol-hexane-water and sodium bis(2-ethylhexyl)sulfosuccinate (AOT)-isooctane-water microemulsions are reported.Dibromide and solvent-incorporated products are formed.In both kinds of microemulsion, the dibromide yield decreases smoothly from 100percent to 10percent as the water content of the reaction medium increases from 0percent to 65percent, whereas in pure water or butanol it is greater than 80percent.The regioselectivity of the water- or butanol-incorporated products is 70:30 Markownikoff: anti-Markovnikoff, a ratio identical with that found in pure methanol, butanol or water.Kinetic bromide-ion effects on the reaction in a water-rich (75percent) SDS microemulsion, show that bromination occurs in the interfacial oil-water region, and not in one of the two microphases, the only brominating agent being molecular bromine and not the tribromide ion.The overall bromination rate constant in this SDS microemulsion (k = 1.6 * 104 dm3 mol-1 s-1) is smaller than that in pure water (2.3 * 107 dm3 mol-1 s-1) and in SDS micelles (2 * 105 dm3 mol-1 s-1), in the same range as that in a 80-20 methanol-water mixture, and greater than that in butanol (2 * 102 dm3 mol-1 s-1).These results are discussed in terms of the particular characteristics (ionization and dissociating abilities, aquation and water properties) of the microemulsion interfaces.
Micellar Effects upon Alkene Bromination. 2. The Role of Alkene Hydrophobicity
Cerichelli, Giorgio,Grande, Celeste,Luchetti, Luciana,Mancini, Giovanna
, p. 3025 - 3030 (2007/10/02)
Surface polarity of cettyltrimethylammonium bromide (CTAB) aqueous micelles was checked by use of as a probe the bromination reaction of a series of 1-alkenes and a water-soluble alkene, cis-4-cyclohexene-1,2-dicarboxylic acid dimethyl ester (I).There was
