- PHOTOCATALYTIC SYSTEM AND APPLICATIONS THEREOF
-
The present invention relates to novel poly(heptazine imides), a photocatalytic system comprising such poly(heptazine imides) and a sulfur source as well as the application thereof in photocatalytic reactions.
- -
-
Page/Page column 38; 39
(2019/05/15)
-
- CAN mediated mechanochemical synthesis of substituted pyridine derivatives
-
A simple, green and cost-effective protocol has been devised for the synthesis of 4-substituted-2,6-dimethyl-3,5-pyridinecarboxylates from Hantzsch-type 1,4-dihydropyridines via rapid oxidation in excellent yields using 1.5 equivalent of ceric ammonium nitrate within 15 minutes in solvent-free conditions. The method was able to furnish the products in excellent yields. The products obtained were characterized by their NMR and melting points data.
- Khanna, Radhika,Dalal, Aarti,Kadyan, Kulbir,Kumar, Ramesh,Kumar, Parvin,Kamboj, Ramesh C.
-
p. 673 - 677
(2018/07/14)
-
- Pyridine five formic acid and potassium compound and its preparation method
-
The invention relates to a pyridine-2,3,4,5,6-pentacarbonic acid dipotassium compound and a preparation method thereof. The pyridine-2,3,4,5,6-pentacarbonic acid dipotassium compound is characterized in that a structure of the compound is shown as a following formula. The preparation method comprises the following steps: ethyl acetoacetate and acetaldehyde are performed with a chemical reaction under catalysis effect of organic amine, then is reacted with ammonia to obtain 2,4,6-trimethyl-1,4-dihydropyridine-3,5-diethyl phthalate; nitric acid oxidation is carried out to obtain 2,4,6-trimethylpyridine-3,5-diethyl phthalate; KOH hydrolysis is carried out to obtain 2,4,6-trimethylpyridine-3,5-dioctyl phthalate dipotassium; and finally KMnO4 oxidation is carried out to obtain the pyridine-2,3,4,5,6-pentacarbonic acid dipotassium compound. The compound can be used as a pH buffering agent, and has large buffer capability when pH value is 2.3. The preparation method has the advantages of simple preparation, low energy consumption, easy acquisition of raw materials, and good popularization and application prospects.
- -
-
Paragraph 0011; 0026; 0028; 0030
(2017/06/02)
-
- Syntheses, Structural Characterization, Reactivity, and Theoretical Studies on Some Heteroligand Oxoperoxotungstate(VI)
-
White microcrystalline diamagnetic oxoperoxotungstate(VI) complexes K[WO(O2)2F]·H2O, K2[WO(O2)2(CO3)]·H2O, [WO(O2)(SO4)(H2O)2] have been synthesized from reaction of Na2WO4·2H2O with aqueous HF, solid KHCO3, aqueous H2SO4 (W:F? 1:3; W: CO3 2 ? 1:1; and W: SO4 2 ? 1:3), and an excess of 30% H2O2 at pH 7.5–8. Precipitation was completed by the addition of precooled acetone. The occurrence of terminal W?O and triangular bidentate O2 2 ?(C 2 v) in the synthesized compounds was ascertained from IR spectra. The IR spectra also suggested that the F? and SO4 2 ? ions in K[WO(O2)2F]·H2O and [WO(O2)(SO4)(H2O)2] were bonded to the WO +4 center in monodentate manner, while CO3 2 ? ion in K2[WO(O2)2(CO3)]·H2O binds the metal center in bidentate chelating fashion. The complex [WO(O2)(SO4)(H2O)2] is stable upto 110°C. The water molecule in [WO(O2)(SO4)(H2O)2] is coordinated to the WO +4 center, whereas it occurs as water of crystallization in the corresponding peroxo(fluoro) and peroxo(carbonato) compounds. Mass spectra of the compounds are in good agreement with the molecular formulae of the complexes. K2[WO(O2)2(CO3)]·H2O acts as an oxidant for bromide in the aqueous-phase bromination of organic substrates to the corresponding bromo-organics, and the complex also oxidizes Hantzsch-1,4-dihydropyridine to the corresponding pyridine derivative in excellent yield at room temperature. Density functional theory computation was carried out to compute the frequencies of relevant vibrational modes and electronic properties, and the results are in agreement with the experimentally obtained data.
- Das, Nandita,Chowdhury, Shubhamoy,Dutta Purkayastha, Ranendra N.
-
-
- Highly crystalline poly(heptazine imides) by mechanochemical synthesis for photooxidation of various organic substrates using an intriguing electron acceptor – Elemental sulfur
-
Low-defect potassium poly(heptazine imide) (PHIK-BM) was engineered for application in photocatalytic oxidation of organic substrates. Mechanochemical pretreatment of a mixture of 5-aminotetrazole in LiCl/KCl eutectics using high-energy ball milling afforded a highly homogeneous mixture that, upon sequential thermolysis at 600?°C, gave nanosized particles of PHIK–BM. The photocatalytic activity of the free-standing PHIK–BM plates was assessed in the oxidation of benzyl alcohol to benzaldehyde under visible light irradiation using elemental sulfur as an electron acceptor. Both quantitative conversion (>99%) of benzyl alcohol and selectivity (>98%) with respect to benzaldehyde were achieved. The developed method was extended to aliphatic alcohol oxidation coupled with multicomponent Hantzsch 1,4-dihydropyridine synthesis. These 1,4-dihydropyridines were also photocatalytically oxidized by PHIK–BM to the corresponding substituted pyridines, with very good yields and under mild metal-free conditions.
- Savateev, Aleksandr,Dontsova, Dariya,Kurpil, Bogdan,Antonietti, Markus
-
p. 203 - 211
(2017/05/04)
-
- 1,4-Dihydropyridines: discovery of minimal AIEEgens and their mitochondrial imaging applications
-
Typical aggregation-induced emission enhancement fluorogens (AIEEgens) generally are designed as propeller-shaped molecules with multiple aromatic rotors. Described herein are 1,4-dihydropyridines, which have the minimum size necessary for AIEE, containing only a single ring, synthesized through a facile biocatalysis procedure. Owing to the AIEE property, intramolecular motion can be restrained by the surrounding environment, causing the radiative channel to open up. Both the fluorescence intensities and the lifetimes of the 1,4-dihydropyridine representatives increased with increasing viscosity, and high sensitivities were observed. On the basis of the single crystal X-ray structures, density functional theory (DFT) calculations were performed to explain the mechanism of the single-ring AIEE behaviour. Moreover, a few of the neutral AIEEgens were found to possess a high specificity towards mitochondria. As an example, one of the AIEEgens exhibited superior photostability and excellent storage tolerance, allowing for real-time imaging, viscosity mapping, and long-term tracking of the dynamics of the mitochondrial morphology.
- Zhang, Wei,Wang, Na,Liu, Yan-Hong,Jiao, Shu-Yan,Zhang, Wei-Wei,Pu, Xue-Mei,Yu, Xiao-Qi
-
supporting information
p. 464 - 469
(2017/01/24)
-
- Synthesis of 1,4-dihydropyridine esters using low-melting sugar mixtures as green solvents
-
Several low-melting sugar mixtures (LMMs) were synthesized and used for preparation of 1,4-dihydropyridines with aldehydes, 1,3-dicarbonyl compounds, and a nitrogen source as starting materials. Good yields, low reaction times, recyclability of LMMs, and catalyst-free methodology are some of the highlights of this new protocol.
- Kumar, J. Ashwin,Shridhar, Gomathi,Ladage, Savita,Ravishankar, Lakshmy
-
supporting information
p. 1989 - 1998
(2016/12/09)
-
- Synthesis of diethyl 4-substituted-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylates as a new series of inhibitors against yeast α-glucosidase
-
1,4-Dihydropyridine-3,5-dicarboxylate derivatives (1-25) were synthesized in high yields via Hantzsch reaction and evaluated for their α-glucosidase inhibitory activity. Compounds 1, 2, 6-8, 11, 13-15, and 23-25 showed a potent inhibitory activity against yeast α-glucosidase with IC50 values in the range of 35.0-273.7 μM, when compared with the standard drug acarbose (IC50 = 937 ± 1.60 μM). Their structures were characterized by different spectroscopic techniques. The kinetics, selectivity, and toxicity studies on these compounds were also carried out. The kinetic studies on most active compounds 14 and 25 determined their modes of inhibition and dissociation constants Ki. Compound 14 was found to be a non-competitive inhibitor with Ki = 25.0 ± 0.06, while compound 25 was identified as a competitive inhibitor with Ki = 66.0 ± 0.07 μM.
- Niaz, Huma,Kashtoh, Hamdy,Khan, Jalaluddin A. J.,Khan, Ajmal,Wahab, Atia-Tul,Alam, Muhammad Tanveer,Khan, Khalid Mohammed,Perveen, Shahnaz,Choudhary, M. Iqbal
-
p. 199 - 209
(2015/04/14)
-
- Silica functionalized sulphonic acid coated with ionic liquid: An efficient and recyclable heterogeneous catalyst for the one-pot synthesis of 1,4-dihydropyridines under solvent-free conditions
-
Silica-supported sulphonic acid catalysts were prepared and coated with ionic liquid, and their catalytic activities were evaluated for the one-pot synthesis of 1,4-dihydropyridines. Different catalysts with an ionic liquid layer (SCILLs) have been prepared with a view to determine the most active catalyst. Silica sulphonic acid coated with [BMIM][PF6] was found to be the most active catalyst and can be recycled for several runs without the loss of significant activity. It was characterized using SEM, TEM, TGA and FTIR.
- Sharma, Pankaj,Gupta, Monika
-
p. 1100 - 1106
(2015/03/04)
-
- Recyclable Bi2WO6-nanoparticle mediated one-pot multicomponent reactions in aqueous medium at room temperature
-
Different types of multicomponent reactions (MCRs) are reported using Bi2O3, BiVO4, and Bi2WO6 (nanoparticle) as heterogeneous catalysts. Among these, Bi2WO6 nanoparticles showed excellent reactivity for the synthesis of functionalized dihydropyridine, polyhydroquinoline, 4H-chromene and 2-amino-4H-benzo[b]pyran derivatives at ambient temperature in aqueous medium. All the reactions gave good to excellent yields in 10-45 minutes in the presence of 5 mol% (optimized) of the catalyst. The catalyst was regenerated and reused up to 5 times without losing catalytic activity. The gram scale synthesis of dihydropyridine gave the desired product in 82% yield in 2 h. This journal is
- Paplal, Banoth,Nagaraju,Veerabhadraiah, Palakollu,Sujatha, Kodam,Kanvah, Sriram,Vijaya Kumar,Kashinath, Dhurke
-
p. 54168 - 54174
(2015/02/18)
-
- Hantzsch 1,4-dihydropyridine synthesis in aqueous ethanol by visible light
-
A highly efficient environment-friendly Hantzsch 1,4-dihydropyridine synthesis under visible light in aqueous ethanol has been achieved in excellent yield via a one-pot three component reaction of various types of aliphatic and aromatic aldehydes with ethyl acetoacetate and ammonium hydroxide solution.
- Ghosh, Somnath,Saikh, Forid,Das, Jhantu,Pramanik, Arun Kumar
-
supporting information
p. 58 - 62
(2013/02/21)
-
- Alkyl transfer from C-C cleavage
-
Hydrogenation was only the beginning: Hantzsch esters have now been used to transfer alkyl groups to imines under mild catalytic conditions to provide a variety of amines (see scheme). Benzyl, secondary alkyl, and tertiary alkyl groups containing ether, ester, and hydroxy functionalities were transferred successfully. The use of Hantzsch esters as alkylation reagents offers a practical and complementary alternative to organometallic processes. Copyright
- Li, Guangxun,Chen, Rong,Wu, Lei,Fu, Qingquan,Zhang, Xiaomei,Tang, Zhuo
-
supporting information
p. 8432 - 8436
(2013/09/02)
-
- Laccase-catalyzed oxidation of Hantzsch 1,4-dihydropyridines to pyridines and a new one pot synthesis of pyridines
-
The laccase-catalyzed oxidation of 1,4-dihydropyridines to pyridines using aerial O2 as the oxidant exclusively delivers pyridines with yields up to 95% under mild reaction conditions. Combination of the Hantzsch 1,4-dihydropyridine synthesis with the newly developed laccase-catalyzed oxidation forms the basis of a facile and environmentally benign method for the synthesis of pyridines in one pot.
- Abdel-Mohsen, Heba T.,Conrad, Juergen,Beifuss, Uwe
-
supporting information
p. 2686 - 2690,5
(2020/09/14)
-
- Thiamine hydrochloride-catalyzed one-pot synthesis of 1,4-dihydropyridine derivatives under solvent-free conditions
-
An efficient one-pot synthesis of 1,4-dihydropyridines from an aldehyde, β-keto ester, and ammonium acetate or formamidine acetate using thiamine hydrochloride (VB1) as the catalyst under solvent-free conditions at ambient temperature is described. All types of aldehydes, including aromatic, aliphatic, and unsaturated aldehydes, give good yields. The catalyst can easily be recovered after completion of the reaction and reused without affecting its activity.
- Lei, Min,Ma, Lei,Hu, Lihong
-
experimental part
p. 1969 - 1976
(2011/06/24)
-
- One-pot, three-component synthesis of 1,4-dihydropyridines in PEG-400
-
A series of Hantzsch 1,4-dihydropyridines were synthesized by one-pot condensation of aldehyde, β-dicarbonyl compound, and ammonium acetate in polyethylene glycol (PEG-400) at 90°C. This method has the advantages of good yields, less pollution, and simple reaction conditions. Copyright
- Wang, Xicun,Gong, Haipeng,Quan, Zhengjun,Li, Lei,Ye, Helin
-
experimental part
p. 3251 - 3258
(2011/09/30)
-
- One-pot synthesis of hantzsch dihydropyridine catalyzed by ionic liquid (BmimOAc) and the oxidative aromatization of dihydropyridine using FeCl 3·6H2O
-
A series of 1,4-dihydropyridines were synthesized in one pot synthesis with the yield of 80-93 % using ionic liquid [bmim]OAc as catalyst and DMF as solvent. The ionic liquid could be repeatedly utilized 5 times with no decrease of the yield. The aromatization of these dihydropyridines (4a, 4b, 4d, 4f, 4h and 4i) were executed by the action of iron chloride and the post-processing was simplified using ethanol instead of water in dissolving dihydropyridines.
- Liu, Ruidong,Zhang, Jian
-
experimental part
p. 1743 - 1746
(2011/12/22)
-
- One-pot, solvent free synthesis of hantzsch 1, 4-dihydropyridines using β-cyclodextrin as a supramolecular catalyst
-
A novel, solvent free and efficient one pot synthesis of 1, 4-dihydropyridine derivatives was achieved in good yields via three component reaction of aldehydes, ethyl acetoacetate and ammonium acetate using inexpensive β- cyclodextrin as a supramolecular catalyst. The catalyst can be recovered and reused without loss of activity.
- Patil, Dipak R.,Dalal, Dipak S.
-
experimental part
p. 477 - 483
(2012/04/23)
-
- Visible-light-induced photoreductive generation of radicals from epoxides and aziridines
-
It's a trap! Both epoxides and aziridines substituted by an aryl ketone can be reduced efficiently using visible-light photoredox catalysts. The radicals generated were trapped by allyl sulfones, and formed α-branched β-hydroxy or amino derivatives with high diastereocontrol (see scheme; dtbbpy=4,4′-di-tert-butyl-2,2′-bipyridine, ppy=2-phenylpyridine). Copyright
- Larraufie, Marie-Helene,Pellet, Remy,Fensterbank, Louis,Goddard, Jean-Philippe,Lacote, Emmanuel,Malacria, Max,Ollivier, Cyril
-
supporting information; experimental part
p. 4463 - 4466
(2011/06/22)
-
- Simple and efficient synthesis of 2,6-dialkyl-3,5-dialkoxycarbonyl-4-(3- aryl-1-phenyl-pyrazol-4-yl)pyridines using TPAP/NMO as a catalyst under mild conditions
-
Biologically important pyrazolylpyridines were synthesized in excellent yield by the oxidation of pyrazolyl 1,4-dihydropyridines (pyrazolyl 1,4-DHPs) using tetrapropylammonium perruthenate/N-methylmorpholine-N-oxide (TPAP/NMO) under mild conditions at 0 °C.
- Murugan,Ramamoorthy,Sundarrajan,Ramakrishna
-
body text
p. 2998 - 3002
(2011/05/04)
-
- Bismuth trichloride - A clean, green catalyst for the synthesis of Hantzsch 1,4-dihydropyridines (DHPs)
-
Hantzsch 1,4-dihydropyridines (DHPs) are synthesized in good to excellent yields from aldehydes, 1,3-dicarbonyl compounds and ammonium acetate using bismuth trichloride which acts as mild Lewis acid promoter and 10 mol% is enough for this protocol under solvent free conditions.
- Bhatti, Ravinder S.,Krishan, Pawan,Suresh,Sandhu, Jagir S.
-
experimental part
p. 707 - 710
(2011/08/06)
-
- Oxidative aromatization of hantzsch 1,4-dihydropyridines by H 2O2/V2o5 at room temperature
-
A mild and highly efficient synthetic method was developed for the aromatization of 1,4-dihydropyridines employing H2O2 and 5mol% of V2O5. The reactions were carried out in CH 3CN to give pyridine compounds in excellent yields. Copyright Taylor & Francis Group, LLC.
- Su, Jinlong,Zhang, Cai,Lin, Dan,Duan, Yiqin,Fu, Xiangkai,Mu, Ruizhu
-
body text
p. 595 - 600
(2010/04/24)
-
- Gallium(III) chloride as an efficient new catalyst for the production of Hantzsch 1,4-dihydropyridines
-
Hantzsch 1,4-dihydropyridines (DHPs) are synthesized in good to excellent yields from aldehydes, 1,3-dicarbonyl compounds and ammonium acetate using gallium(III) chloride which acts as dehydrating agents and 5 mol% is enough for this protocol under solvent free conditions.
- Kumar, Dhruva,Saini, Anil,Suresh,Sandhu, Jagir S.
-
experimental part
p. 996 - 1000
(2010/07/09)
-
- New efficient protocol for the production of hantzsch 1,4-dihydropyridines using RuCl3
-
Hantzsch 1,4-dihydropyridines are synthesized in a few minutes and in good to excellent yields from aldehydes, 1,3-dicarbonyl compounds, and ammonium acetate. The reaction is performed in solvent-free conditions, and 5mol% of RuCl3 is enough for this protocol.
- Kumar, Dhruva,Sandhu, Jagir S.
-
experimental part
p. 1957 - 1965
(2009/10/09)
-
- Efficient synthesis of Hantzsch esters and polyhydroquinoline derivatives in aqueous micelles
-
Hantzsch 1,4-dihydropyridine and polyhydroquinoline derivatives were synthesized in excellent yields in aqueous micelles. The reaction is catalyzed by PTSA and strongly accelerated by ultrasonic irradiation. Georg Thieme Verlag Stuttgart.
- Kumar, Atul,Maurya, Ram Awatar
-
p. 883 - 885
(2008/12/22)
-
- Aromatization of 1,4-dihydropyridines using tetraethylammonium bromate as an oxidizing agent
-
Quaternary ammonium bromate have been prepared from the corresponding bromide and used as a mild and efficient oxidizing agent for the aromatization of Hantzsch esters and related compounds to pyridine derivatives.
- Das, Pranab J.,Baruah, Akashi
-
experimental part
p. 1568 - 1571
(2009/04/07)
-
- Environmentally friendly and efficient synthesis of various 1,4-dihydropyridines in pure water
-
An environmentally friendly and efficient synthesis of a series of 1,4-dihydropyridines was developed by the practical one-pot reactions of aldehydes with ammonium acetate and 1,3-dicarbonyl compounds such as alkyl acetoacetate, 5,5-dimethyl-1,3-cyclohexanedione, 1,3-cyclohexanedione, and 2,4-pentanedione in water without any additives under refluxing conditions.
- Wang, Guan-Wu,Xia, Jing-Jing,Miao, Chun-Bao,Wu, Xue-Liang
-
p. 454 - 459
(2007/10/03)
-
- Microwave-assisted oxidative aromatization of Hantzsch 1,4-dihydropyridines using manganese dioxide
-
4-Aryl- and 4-alkyl-1,4-dihydropyridines, prepared by microwave-assisted Hantzsch reaction, are readily and efficiently aromatized in only one minute using commercial manganese dioxide in the absence of an inorganic support at 100 °C under microwave irradiation. This rapid procedure is more efficient than microwave-assisted aromatization using Pd/C, iodine or o-iodoxybenzoic acid (IBX) and gives the dehydrogenated or 4-dealkylated product in 91-100% yield (13 examples). Georg Thieme Verlag Stuttgart.
- Bagley, Mark C.,Lubinu, M. Caterina
-
p. 1283 - 1288
(2007/10/03)
-
- Synthesis of Hantsch 1,4-dihydropyridines by fermenting bakers' yeast
-
Hantsch 1,4-dihydropyridines are prepared by fermenting bakers' yeast with alkyl acetoacetate and ammonium acetate.
- Lee, Jung Hwan
-
p. 7329 - 7330
(2007/10/03)
-
- One-pot synthesis and aromatization of 1,4-dihydropyridines in refluxing water
-
A series of 1,4-dihydropyridines were synthesized in an environmentally benign method, by reacting aldehydes with acetoacetate esters or acetylacetone and ammonium acetate in refluxing water. The thus formed 1,4-dihydropyridines was subsequently oxidized in one-pot to the corresponding pyridine derivatives by either ferric chloride or potassium permanganate. Georg Thieme Verlag Stuttgart.
- Xia, Jing-Jing,Wang, Guan-Wu
-
p. 2379 - 2383
(2007/10/03)
-
- Synthesis of substituted 1,4-dihydropyridines in water using phase-transfer catalyst under microwave irradiation
-
The synthesis of various substituted 1,4-dihydropyridines has been achieved by the reaction of aldehydes, ethyl/methyl acetoacetates, and ammonium acetate in water using phase-transfer catalyst under microwave irradiation. Compared to the classical Hantzsch's reaction conditions, this new method consistently has the advantage of good yields and short reaction times. Bifunctional compounds containing two units have been synthesized using dialdehyde as precursor in good yields.
- Salehi, Hojatollah,Guo, Qing-Xiang
-
p. 4349 - 4357
(2007/10/03)
-
- Synthesis of 1,4-dihydropyridines under solvent-free conditions
-
Ethyl acetoacetate and a range of aldehydes in the presence of ammonium acetate are converted into 1,4-dihydropyridines under mild and solvent-free conditions with good to excellent yields.
- Zolfigol, Mohammad Ali,Safaiee, Maliheh
-
p. 827 - 828
(2007/10/03)
-
- Photocatalytic Hydrogen Production from Hantzsch 1,4-Dihydropyridines by Platinum(II) Terpyridyl Complexes in Homogeneous Solution
-
1,4-Dihydropyridines have been photocatalytically oxidized to pyridines by platinum(II) terpyridyl complexes with the generation of hydrogen in homogeneous solution. The hydrogen production proceeds in quantitative yield and with great catalytic turnover. Copyright
- Zhang, Dong,Wu, Li-Zhu,Zhou, Li,Han, Xue,Yang, Qing-Zheng,Zhang, Li-Ping,Tung, Chen-Ho
-
p. 3440 - 3441
(2007/10/03)
-
- Formation of pyridines from N-methylpyrimidinium iodide and enaminoesters
-
The reaction of N-methylpyrimidinium iodide with enaminoesters yiels a mixture of 3-ethoxycarbonyl-2-methylpyridine and 3,5-diethoxycarbonyl-2,6-dimethylpyridine.Mechanisms of the transformations of the pyrimidine ring found are suggested. - Keywords: N-methylpyridinium iodide; enaminoesters; ring transformation; pyridines; β-substituted.
- Gromov, S. P.,Razinkin, M. A.
-
p. 1272 - 1275
(2007/10/02)
-
- CARBON TRANSFER REACTIONS WITH HETEROCYCLES-V. A FACILE SYNTHESIS OF NIFEDIPINE AND ANALOGUES
-
Oxazolidines and tetrahydro-(2H)-1,3-oxazines transfer their C(2) units at the carbonyl group oxidation level to alkyl-β-amino/anilinocrotonates to form 1,4-dihydropyridines elaborated at C-4.
- Singh, Harjit,Singh, Kamaljit
-
p. 3967 - 3974
(2007/10/02)
-
- Esters of 1,4-dihydropyridine-3- and -3,5-carbothiolic acids
-
Methods for the preparation of esters of 1,4-dihydropyridine-3- and -3,5-carbothiolic acids were developed, and their structure and reactivity were studied. A comparative analysis was made of the spectroscopic characteristics of sulfur-containing esters of the 1,4-dihydropyridine series and their oxygen analogs. More strongly expressed electron-acceptor properties of the COSAlk groupings as compared with alkoxycarbonyl substituents were observed.
- Vigante,Ozols,Dubur,Beilis,Belash,Prezhdo
-
p. 170 - 178
(2007/10/02)
-