- Synthesis of new Zn (II) complexes for photo decomposition of organic dye pollutants, industrial wastewater and photo-oxidation of methyl arenes under visible-light
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Synthesis of new Schiff's base Zn-complexes for photo-oxidation of methyl arenes and xylenes are reported under visible light irradiation conditions. All the synthesized new ligands and Zn-complexes are thoroughly characterized with various spectral analyses and confirmed as 1:1 ratio of Zn and ligand with distorted octahedral structure. The bandgap energies of the ligands are higher than its Zn-complexes. These synthesized new Zn(II) complexes are used for the photo-fragmentation of organic dye pollutants, photodegradation of food industrial wastewater and oxidation of methyl arenes which are converted into its respective aldehydes with moderate yields under visible light irradiation. The photooxidation reaction dependency on the intensity of the visible light was also studied. With the increase in the dosage of photocatalyst, the methyl groups are oxidized to get aldehydes and mono acid products, which are also identified from LC-MS data. Finally, [Zn(PPMHT)Cl] is with better efficiency than [Zn(PTHMT)Cl] and [Zn(MIMHPT)Cl] for oxidation of methyl arenes is reported under visible-light-driven conditions.
- Ahemed, Jakeer,Bhongiri, Yadagiri,Chetti, Prabhakar,Gade, Ramesh,Kore, Ranjith,Pasha, Jakeer,Pola, Someshwar,Rao D, Venkateshwar
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- A one-pot synthesis of benzimidazoles via aerobic oxidative condensation of benzyl alcohols with o-phenylenediamines catalyzed by [MIMPs]+Cl-/NaNO2/TEMPO
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The ionic liquid 1-methyl-3-(3-sulfopropyl)imidazolium chloride ([MIMPs]+Cl-) in combination with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and sodium nitrite (NaNO2) as a catalytic system demonstrates high efficiency in the one-pot two-step aerobic oxidative condensation of benzyl alcohols with 1,2-phenylenediamines to give benzimidazoles. Various benzimidazoles are obtained in good to excellent yields by this strategy.
- Geng, Zhenzhen,Zhang, Hong-Yu,Yin, Guohui,Zhang, Yuecheng,Zhao, Jiquan
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p. 557 - 565
(2020/03/30)
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- Aerobic oxidation of alcohols by copper(I)/benzoxazine ligand/TEMPO under mild and base-free conditions
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A novel benzoxazine ligand with an imidazole moiety was synthesized. This ligand in combination with Cu(OTf) and TEMPO efficiently catalyzed aerobic oxidation of active primary alcohols and also showed good to excellent activity in the oxidation of secondary alcohols under mild and base-free conditions.
- Zhang,Huang,Lü,Cao,Zhao
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p. 1965 - 1972
(2015/10/12)
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- Palladium-catalyzed synthesis of aldehydes from aryl halides and tert-butyl isocyanide using formate salts as hydride donors
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An efficient one-pot palladium-catalyzed hydroformylation of aryl halides to produce aromatic aldehydes has been achieved, employing tert-butyl isocyanide as a C1 resource and formate salt as a hydride donor without any additional bases. Characterized by its mild reaction conditions, easy operation and lower toxicity, this reaction can tolerate a wide array of functional groups with moderate to excellent yields.
- Zhang, Ying,Jiang, Xiao,Wang, Jin-Mei,Chen, Jing-Lei,Zhu, Yong-Ming
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p. 17060 - 17063
(2015/03/30)
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- Deep eutectic solvent supported TEMPO for oxidation of alcohols
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A novel deep eutectic solvent supported TEMPO (DES-TEMPO) composed of N,N-dimethyl-(4-(2,2,6,6-tetramethyl-1-oxyl-4-piperidoxyl)butyl)dodecyl ammonium salt ([Quaternium-TEMPO]+Br-) and urea was prepared. An efficient catalytic system for the oxidation of alcohols with molecular oxygen as terminal oxidant has been developed from DES-TEMPO and Fe(NO3)3·9H2O. The DES-TEMPO/Fe(NO3)3system showed good performances on the selective oxidation of various alcohols to the corresponding aldehydes and ketones under mild and solvent-free conditions. The DES could be recovered easily and recycled up to five times in the oxidation of benzyl alcohol without significant loss of catalytic activity. This journal is
- Zhang, Yuecheng,Lü, Fenglian,Cao, Xiaohui,Zhao, Jiquan
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p. 40161 - 40169
(2015/02/03)
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- Palladium-catalyzed formylation of aryl halides with tert -butyl isocyanide
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A novel palladium-catalyzed formylation of aryl halides with isocyanide in the presence of Et3SiH has been demonstrated, which provides a strategy toward important aldehydes with moderate to excellent yield. The advantage of this reaction includes milder conditions, convenient operation, lower toxicity, and wide functional group tolerance.
- Jiang, Xiao,Wang, Jin-Mei,Zhang, Ying,Chen, Zhong,Zhu, Yong-Ming,Ji, Shun-Jun
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supporting information
p. 3492 - 3495
(2014/07/21)
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- Electrophilicities of symmetrically substituted 1,3-diarylallyl cations
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Kinetics of the reactions of nine symmetrically substituted 1,3-diarylallyl cations with different nucleophiles were studied photometrically in dichloromethane, acetonitrile, and DMSO solutions. The second-order rate constants k2 were found to follow the correlation log k2 = sN(N + E). The electrophilicity parameters E of the title cations were derived, using the known values of sN and N of the nucleophilic reaction partners, and compared with the electrophilicities of analogously substituted benzhydrylium ions. Good linear correlations were found between the electrophilicities E and the quantum chemically calculated gas-phase methyl anion affinities of the allyl cations and the σ+ constants of the substituents X.
- Troshin, Konstantin,Schindele, Claus,Mayr, Herbert
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experimental part
p. 9391 - 9408
(2012/01/06)
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- Synthesis and mesomorphic properties of tolane-based fluorinated liquid crystals with an acrylate linkage
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Six series of tolane-based fluorinated liquid crystals containing an acrylate linker were synthesized and their mesomorphic properties were characterized. The compounds generally exhibit SmA and N phases in wide temperature ranges. The introduction of acrylate linkers increases the clearing points by 20°C-30°C and suppresses the formation of higher ordered monotropic SmB phases. para-Fluorination is favorable for the mesophase stability, whereas meta-fluorination is not. The introduction of a 2,3,5,6-tetrafluorophenylene group decreases the clearing points and also suppresses the formation of the monotropic SmB phase. Copyright Taylor & Francis Group, LLC.
- Chen, Ximin,Shen, Yuehai,Wen, Jianxun
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experimental part
p. 138 - 146
(2011/05/12)
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- TEMPO/HCl/NaNO2 catalyst: A transition-metal-free approach to efficient aerobic oxidation of alcohols to aldehydes and ketones under mild conditions
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Hydrochloric acid, a very inexpensive and readily available inorganic acid, has been found to cooperate exquisitely with NaNO2/TEMPO in catalyzing the molecular-oxygen-driven oxidation of a broad range of alcohol substrates to the corresponding aldehydes and ketones. This transition-metal- free catalytic oxidative conversion is novel and represents an interesting alternative route to the corresponding carbonyl compounds to the metal-catalyzed aerobic oxidation of alcohols.The reaction is highly selective with respect to the desired product when carried out at room temperature in air at atmospheric pressure. Notably, the use of very inexpensive NaNO2 and HCl in combination with TEMPO for this highly selective aerobic oxidation of alcohols in air at ambient temperaturemakes the reaction operationally and economically very attractive. The results of mechanistic studies, performed with the aid of electrospray ionization mass spectrometry (ESI-MS), are presented and discussed. TEMPO, TEMPOH, and TEMPO+ were observed in the redox cycle by means of ESI-MS. On the basis of these observations, a mechanism is proposed that may provide an insight into the newly developed aerobic alcohol oxidation.
- Wang, Xinliang,Liu, Renhua,Jin, Yu,Liang, Xinmiao
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supporting information; experimental part
p. 2679 - 2685
(2009/04/10)
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- Fluorine-substituted-4-alkenylbenzoic acid and derivatives thereof, and nematic liquid crystal composition containing cyanophenyl benzoate derivatives and liquid crystal display system using the same
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A novel liquid crystal compound, a nematic liquid crystal composition, and a liquid crystal display system using the composition are disclosed herein. The liquid crystal compound is represented by the general formula (I): wherein R represents a hydrogen a
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- Preparation of 7-(3-amino- and 3-amino-methyl-1-pyrrolidinyl)-3-quinolonecarboxylic acids and -naphthyridonecarboxylic acids
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Process for the preparation of antibacterial compounds of the formula STR1 comprises condensing an oxo compound of the formula STR2 with an amino compound of the formula STR3 to produce a compound of the formula STR4 reacting the compound of the formula (III) with a compound of the formula STR5 to give a compound of the formula STR6 and then eliminating the amino-protective group STR7
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- OBSERVATIONS ON THE VILSMEIER REACTION Part 2. THE ANOMALOUS REACTION OF N-BENZYL N-CYANOETHYL-4-METHYLANILINE DERIVATIVES
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The reaction of a series of the title anilines (1) with variously substituted benzyl groups under Vilsmeier conditions was invesigated.Only perfluorobenzyl derivatives showed normal formylation while other fluoro derivatives gave mixed results and other substituents gave solely the anomalous amine (5) together with the aldehyde (6) derived from the benzyl group.
- Shawcross, Andrew P.,Stanforth, Stephen P.
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p. 7063 - 7076
(2007/10/02)
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- 4-Aralkyl-5-substituted-1,2,4-triazole-5-thiols
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Compounds of formula (I) and pharmaceutically acceptable salts thereof are described in which, n is 0 to 5; X1 to X5 are any accessible combination of hydrogen, halogen, C1 6alkyl, C1 6alkoxy, cyano, nitro, SONH2, SO2NH2, SO2CH3, SO2CH2F, SO2CHF2, SO2CF3, CF3, CHO, OH, CH2OH, CO2H, or CO2CpH2p+1wherein p is 1 to 4; R1 is phenyl substituted by X1 to X5, C1 4alkyl, C3 6cycloalkyl, or an arylC1 4alkyl group substituted by X1 to X5; R2 is hydrogen, C1 4alkyl or (CH2)m-CO2R3; m is 0 to 5; and R3 is H or C1 4alkyl. These compounds are dopamine-β-hydroxylase inhibitors. Pharmaceutical compositions are described as are methods of use. Processes for the preparation of these compounds are described.
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- Dopamine-beta-hydroxylase inhibitors
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Compounds of Formula : in which n is 0 to 5, R is hydrogen or C1-4alkyl and X is hydrogen, halo, C1-4alkyl, CN, NO2, SO2NH2, COOH, CHO, OH, CH2OH, C1-4alkoxy, CF3, SO
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- Benzylamines: Synthesis and evaluation of antimycobacterial properties
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The synthesis of benzylamines with various N-alkyl chains and substituents in the aromatic system as well as their evaluation on Mycobacterium tuberculosis H 37 Ra are described. The most active compounds in this test, N-methyl-3-chlorobenzylamine (MIC 10.2 μg/mL), N-methyl-3,5-dichlorobenzylamine (93, MIC 10.2 μg/mL), and N-butyl-3,5-difluorobenzylamine (MIC 6.4 μg/mL), also exhibited a marked inhibitory effect on Mycobacterium marinum and Mycobacterium lufu used for the determination of antileprotic properties. The combination of 93 with aminosalicylic acid, streptomycin, or dapsone exert marked supra-additive effects on M. tuberculosis H 37 Ra.
- Meindl,Von Angerer,Schonenberger,Ruckdeschel
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p. 1111 - 1118
(2007/10/02)
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- Fluorine containing 2,4,5-triphenylimidazoles
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Fluorosubstituted benzaldehydes are condensed with anisil and ammonium acetate to yield the corresponding 2-(fluorosubstituted phenyl)-4,5-bis(4-methoxyphenyl)imidazoles. Alternatively fluorosubstituted benzaldehydes are condensed with anisil monoxime and ammonium acetate to yield the corresponding 2-(fluorosubstituted phenyl)-4,5-bis(4-methoxyphenyl)-imidazole-3-oxides which can subsequently be reduced to yield the corresponding 2-(fluorosubstituted phenyl)-4,5-bis(4-methoxyphenyl)imidazoles. These imidazoles have interesting pharmacological properties.
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