Log in

Relevant bibliographies by topics / Phase Transfer Catalysis (PTC) / Journal articles

To see the other types of publications on this topic, follow the link: Phase Transfer Catalysis (PTC).

Journal articles on the topic 'Phase Transfer Catalysis (PTC)'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Phase Transfer Catalysis (PTC).'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Wang, Chuan-Hui, Chen-Fu Liu, and Guo-Wu Rao. "Green Application of Phase-Transfer Catalysis in Oxidation: A Comprehensive Review." Mini-Reviews in Organic Chemistry 17, no. 4 (2020): 405–11. http://dx.doi.org/10.2174/1570193x16666190617154733.

Full text

Abstract:

Oxidation reactions have emerged as one of the most versatile tools in organic chemistry. Various onium salts such as ammonium, phosphonium, arsonium, bismuthonium, tellurium have been used as phase transfer catalysts in many oxidation reactions. Certainly, considerable catalysts have been widely used in Phase-Transfer Catalysis (PTC). This review focuses on the application of PTC in various oxidation reaction. Furthermore, PTC also conforms to the concept of “Green Chemistry”. <p></p> • Oxidation has become one of the most widely used tools in organic chemistry and phase transfer

APA, Harvard, Vancouver, ISO, and other styles

2

Zhao, Qianqiang, Xiao Zhao, Hui Peng, et al. "Static phase transfer catalysis for Williamson reactions: Pickering interfacial catalysis." Catalysis Science & Technology 9, no. 13 (2019): 3445–53. http://dx.doi.org/10.1039/c9cy00620f.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Nur, Hadi. "A Perspective on Catalysis in the Immiscible Liquid-Liquid System." Journal of the Indonesian Chemical Society 2, no. 2 (2019): 66. http://dx.doi.org/10.34311/jics.2019.02.2.66.

Full text

Abstract:

This manuscript provides a perspective on research work related to the catalysis in the immiscible liquid-liquid system. Three catalytic concepts, i.e., phase-transfer catalysis (PTC), triphase catalysis (TPC), and phase-boundary catalysis (PBC), are presented as well as their use for the design of a better catalytic system. This perspective emphasizes based on the SWO (Strengths, Weaknesses, and Opportunities) analysis of PTC, TPC, and PBC and advances concept uses for future directions of research in this area.

APA, Harvard, Vancouver, ISO, and other styles

4

Della Sala, Giorgio, Rosaria Schettini, Marina Sicignano, Francesco De Riccardis, and Irene Izzo. "Macrocyclic Hosts in Asymmetric Phase-Transfer Catalyzed Reactions." Synthesis 50, no. 24 (2018): 4777–95. http://dx.doi.org/10.1055/s-0037-1610311.

Full text

Abstract:

The introduction and development of neutral macrocyclic hosts capable of complexing ions within their pre-organized cavity, has been of utmost importance in supramolecular chemistry. Their ability to form stable organic-soluble metal–macrocycle complexes opened up the way to their application in phase-transfer catalysis (PTC) as a viable alternative to quaternary onium salts. In particular, their conformationally rigid preorganized backbone, accommodating organic substrates in defined orientations, promotes highly efficient stereoselective reactions. This short review summarizes the applicatio

APA, Harvard, Vancouver, ISO, and other styles

5

Wu, Jia-Hong, Jianke Pan, and Tianli Wang. "Dipeptide-Based Phosphonium Salt Catalysis: Application to Enantioselective Synthesis of Fused Tri- and Tetrasubstituted Aziridines." Synlett 30, no. 19 (2019): 2101–6. http://dx.doi.org/10.1055/s-0039-1690192.

Full text

Abstract:

Over the past decades, phase-transfer catalysis (PTC), generally based on numerous chiral quaternary ammonium salts, has been recognized as a powerful and versatile tool for organic synthesis in both industry and academia. In sharp contrast, PTC involving chiral phosphonium salts as the catalysts is insufficiently developed. Recently, our group realized the first enantioselective aza-Darzens reaction for preparing tri- and tetrasubstituted aziridine derivatives under bifunctional phosphonium salt catalysis. This article briefly discusses the recent development in asymmetric reactions (mainly i

APA, Harvard, Vancouver, ISO, and other styles

6

El-Sayed, Ahmed M., Omyma A. Abd Allah, Ahmed M. M. El-Saghier, and Shaaban K. Mohamed. "Synthesis and Reactions of Five-Membered Heterocycles Using Phase Transfer Catalyst (PTC) Techniques." Journal of Chemistry 2014 (2014): 1–47. http://dx.doi.org/10.1155/2014/163074.

Full text

Abstract:

Phase transfer catalysts (PTCs) have been widely used for the synthesis of organic compounds particularly in both liquid-liquid and solid-liquid heterogeneous reaction mixtures. They are known to accelerate reaction rates by facilitating formation of interphase transfer of species and making reactions between reagents in two immiscible phases possible. Application of PTC instead of traditional technologies for industrial processes of organic synthesis provides substantial benefits for the environment. On the basis of numerous reports it is evident that phase-transfer catalysis is the most effi

APA, Harvard, Vancouver, ISO, and other styles

7

Hegde, Narayan G. "Phase Transfer Catalysis: New Technology to Boost Organic Farming." Asian Journal of Research in Crop Science 9, no. 3 (2024): 86–94. http://dx.doi.org/10.9734/ajrcs/2024/v9i3292.

Full text

Abstract:

Introduction of Phase Transfer Catalysis (PTC) technology, which was developed in the 1970s has revolutionised the dyes and pharmaceutical industries in many ways. PTC is a process that facilitates the organic compounds to move from one phase to another phase, without any change in the chemical qualities. Application of this technology was explored in the 1980s for agriculture, by using different plant extracts as PT catalysts. The objective was to facilitate increased absorption of nutrients by plants, by stimulating plant growth and easy availability of nutrients in the soil. Introduction of

APA, Harvard, Vancouver, ISO, and other styles

8

Lewandowski, Grzegorz. "Comparison of the methods of the phase transfer catalysis and hydroperoxide in the epoxidation of 1,5,9-cyclododecatriene." Polish Journal of Chemical Technology 9, no. 3 (2007): 101–4. http://dx.doi.org/10.2478/v10026-007-0065-0.

Full text

Abstract:

Comparison of the methods of the phase transfer catalysis and hydroperoxide in the epoxidation of 1,5,9-cyclododecatriene The process of the epoxidation of cis, trans, trans-1,5,9-cyclododecatriene (CDT) to 1,2-epoxy-5,9-cyclododecadiene (ECDD) with the 30% aqueous hydrogen peroxide under the phase transfer conditions and with tert-butyl hydroperoxide under the homogeneous conditions was investigated. Onium salts such as Aliquat® 336, Arquad® 2HT, methyltrioctylammonium bromide and the Na2WO4/H3PO4 catalyst system are very active under the phase transfer catalysis (PTC) conditions for the sele

APA, Harvard, Vancouver, ISO, and other styles

9

Iribarren, Iñigo, and Cristina Trujillo. "Improving phase-transfer catalysis by enhancing non-covalent interactions." Physical Chemistry Chemical Physics 22, no. 37 (2020): 21015–21. http://dx.doi.org/10.1039/d0cp02012e.

Full text

Abstract:

A theoretical study of the interactions established between an alkaloid quinine-derived PTC and different anions of interest was performed. Ion pairing competes with an intermolecular hydrogen bond between the PT counteranion and potential HB donors.

APA, Harvard, Vancouver, ISO, and other styles

10

Makosza, Mieczyslaw. "Phase-transfer catalysis. A general green methodology in organic synthesis." Pure and Applied Chemistry 72, no. 7 (2000): 1399–403. http://dx.doi.org/10.1351/pac200072071399.

Full text

Abstract:

Basic concept of phase-transfer catalysis (PTC), its field of applications and specific features as the most general, efficient, and environment-friendly green methodology of organic synthesis, particularly for industrial processes, is discussed.

APA, Harvard, Vancouver, ISO, and other styles

11

Padmaja, Adivireddi, Kalluru Ramachandra Reddy, Venkatapuram Padmavathi, and Dandu Bhaskar Reddy. "Cyclopropanation of Phenyl Styryl Sulfones with Phenacylsulfonium Ylides Under Phase-Transfer Catalysis." Collection of Czechoslovak Chemical Communications 63, no. 6 (1998): 835–41. http://dx.doi.org/10.1135/cccc19980835.

Full text

Abstract:

Cyclopropanation of substituted phenyl styryl sulfones 1 with dimethylsulfonium phenacylides was carried out by two different methods (under PTC catalysis with in situ generation of the ylides and by direct addition of ylides) to obtain a series of substituted 1-benzenesulfonyl-2-benzoyl-3-phenylcyclopropanes 2. The PTC method was found to be more facile and efficient. The spectral data of cyclopropanes 2 are discussed.

APA, Harvard, Vancouver, ISO, and other styles

12

Kopeć, Daniel, Stefan Baj, and Agnieszka Siewniak. "Ultrasound-Assisted Green Synthesis of Dialkyl Peroxides under Phase-Transfer Catalysis Conditions." Molecules 25, no. 1 (2019): 118. http://dx.doi.org/10.3390/molecules25010118.

Full text

Abstract:

The dialkyl peroxides, which contain a thermally unstable oxygen–oxygen bond, are an important source of radical initiators and cross-linking agents. New efficient and green methods for their synthesis are still being sought. Herein, ultrasound-assisted synthesis of dialkyl peroxides from alkyl hydroperoxides and alkyl bromides in the presence of an aqueous solution of an inorganic base was systematically studied under phase-transfer catalysis (PTC) conditions. The process run in a tri-liquid system in which polyethylene glycol as a phase-transfer catalyst formed a third liquid phase between t

APA, Harvard, Vancouver, ISO, and other styles

13

Pascariu, Aurelia, Gheorghe Ilia, Alina Bora, et al. "Wittig and Wittig-Horner reactions under phase transfer catalysis conditions." Open Chemistry 1, no. 4 (2003): 491–534. http://dx.doi.org/10.2478/bf02475230.

Full text

Abstract:

AbstractWittig and Wittig-Horner reactions are favorite tools in preparative organic chemistry. These olefination methods enjoy widespread and recognition because of their simplicity, convenience, and effciency. Phase transfer catalysis (PTC) is a very important method in synthetic organic chemistry having many advantages over conventional, homogenous reaction procedures. In this paper, we attempt to summarize the aspects concerning Wittig and Wittig-Horner reactions that take place under phase transfer catalysis conditions.

APA, Harvard, Vancouver, ISO, and other styles

14

Wang, Hui, Hongfei Lin, Xiaohu Li, et al. "Application of Phase Transfer Catalysis in the Esterification of Organic Acids: The Primary Products from Ring Hydrocarbon Oxidation Processes." Catalysts 9, no. 10 (2019): 851. http://dx.doi.org/10.3390/catal9100851.

Full text

Abstract:

For enhancing the cetane number (CN) of diesel fraction, the selective oxidative ring opening method was applied to upgrade ring hydrocarbons. Organic acids, one of the main products from this oxidative reaction, being esterified by the phase transfer catalysis (PTC) approach were studied. Adipic acid, benzoic acid, and phthalic acid were used as model compounds. Reaction time, reaction temperature, the amount of water, and the amount of catalyst in the esterification process were investigated and optimized using orthogonal experimental design method. The kinetics of esterification process was

APA, Harvard, Vancouver, ISO, and other styles

15

Wladislaw, Blanka, Mauro Alves Bueno, Liliana Marzorati, Claudio Di Vitta, and Júlio Zukerman-Schpector. "Phase Transfer Catalysis (PTC) Sulfanylation of Some 2-Methylsulfinyl-Cyclanones." Journal of Organic Chemistry 69, no. 26 (2004): 9296–98. http://dx.doi.org/10.1021/jo048751x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Freedman, H. H. "Industrial applications of phase transfer catalysis (PTC): past, present and future." Pure and Applied Chemistry 58, no. 6 (1986): 857–68. http://dx.doi.org/10.1351/pac198658060857.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Margi, Nikhil H., and Ganapati D. Yadav. "Design and Development of Novel Continuous Flow Stirred Multiphase Reactor: Liquid–Liquid–Liquid Phase Transfer Catalysed Synthesis of Guaiacol Glycidyl Ether." Processes 8, no. 10 (2020): 1271. http://dx.doi.org/10.3390/pr8101271.

Full text

Abstract:

Phase transfer catalysed (PTC) reactions are used in several pharmaceutical and fine chemical industrial processes. We have developed a novel stirred tank reactor (Yadav reactor) to conduct batch and continuous liquid–liquid–liquid (L-L-L) PTC reactions. The reactor had a provision of using three independent stirrers for each phase, thereby having complete control over the rate of mass transfer across the two interfaces. In the continuous mode of operation, the top and bottom phases were continuously fed into the reactor while the middle phase was used as a batch. All three stirrers were used

APA, Harvard, Vancouver, ISO, and other styles

18

Lewandowski, Grzegorz. "Efficiency of selected phase transfer catalysts for the synthesis of 1,2-epoxy-5,9-cyclododecadiene in the presence of H2O2/H3PW12O40 as catalytic system." Polish Journal of Chemical Technology 15, no. 3 (2013): 96–99. http://dx.doi.org/10.2478/pjct-2013-0053.

Full text

Abstract:

Abstract The results of the studies on the influence of the phase transfer catalyst on the epoxidation of (Z,E,E)-1,5,9-cyclododecatriene (CDT) to 1,2-epoxy-5,9-cyclododecadiene (ECDD) in the H2O2/H3PW12O40 system by a method of phase transfer catalysis (PTC) were presented. The following quaternary ammonium salts were used as phase transfer catalysts: methyltributylammonium chloride, (cetyl)pyridinium bromide, methyltrioctylammonium chloride, (cetyl)pyridinium chloride, dimethyl[dioctadecyl(76%)+dihexadecyl(24%)] ammonium chloride, tetrabutylammonium hydrogensulfate, didodecyldimethylammonium

APA, Harvard, Vancouver, ISO, and other styles

19

Razumova, Nina G., Aleksandr E. Shumeiko, Anatolii A. Afon’kin, and Anatolii F. Popov. "A New Phenomenon in Phase-transfer Catalysis (PTC): Topoinduced Stereoselectivity in the Phase-transfer Phenolysis of Cyclophosphazenes." Mendeleev Communications 4, no. 2 (1994): 64–65. http://dx.doi.org/10.1070/mc1994v004n02abeh000351.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Landini, D. "Phase transfer catalysis (PTC): search for alternative organic solvents, even environmentally benign." Journal of Molecular Catalysis A: Chemical 204-205 (September 15, 2003): 235–43. http://dx.doi.org/10.1016/s1381-1169(03)00304-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Albanese, Domenico C. M., Nicoletta Gaggero, and Kamila Prenga. "Synthesis of 3,4-Dihydropyridin-2-ones via Domino Reaction under Phase Transfer Catalysis Conditions." Catalysts 13, no. 1 (2023): 170. http://dx.doi.org/10.3390/catal13010170.

Full text

Abstract:

3,4-dihydropyridin-2-ones are of considerable importance due to the large number of these core structures exhibiting a diverse array of biological and pharmacological activities. The Michael-type addition of 1,3-dithiane-2-carbothioates to α,β-unsaturated N-tosyl imines, followed by intramolecular annulation driven by a sulfur leaving group, provides a practical reaction cascade for the synthesis of a variety of substituted 3,4-dihydropyridin-2-ones. In this work, the reaction was carried out under solid–liquid phase transfer catalysis (SL-PTC) conditions at room temperature, in short reaction

APA, Harvard, Vancouver, ISO, and other styles

22

Sankarshana, T., J. Soujanya, and A. Anil Kumar. "Triphase Catalysis Using Silica Gel as Support." International Journal of Chemical Reactor Engineering 11, no. 1 (2013): 347–52. http://dx.doi.org/10.1515/ijcre-2013-0007.

Full text

Abstract:

Abstract The oxidation reaction of 2-ethyl-1-hexanol with potassium permanganate in the presence and absence of silica-gel-supported phase-transfer catalyst (PTC) in triphasic conditions was studied. In a batch reactor, the performance of the solid-supported catalysts was compared with unsupported catalyst and without the catalyst. The effect of speed of agitation, catalyst concentration, potassium permanganate concentration and temperature on reaction rate was studied. The reaction is found to be in the kinetic regime. The rate of reaction with the catalyst immobilised on the silica gel was l

APA, Harvard, Vancouver, ISO, and other styles

23

Depreux, P., and A. Marcincal-Lefebvre. "Application des conditions de réaction par transfert de phase à la synthèse d'amino-éthers dérivés du trans phénoxy-2 cyclohexanol." Canadian Journal of Chemistry 64, no. 3 (1986): 626–32. http://dx.doi.org/10.1139/v86-101.

Full text

Abstract:

Amino-ethers of trans-2-phenoxycyclohexanol were prepared by methods involving anhydrous conditions (sodium alkoxides in xylene) or phase transfer catalysis conditions (liquid–liquid or solid–liquid two-phase systems). Various factors were optimized. In the liquid–liquid two-phase system, when no catalyst was added, reaction proceeds with comparable or even better yields than with some PTC catalysts, a quaternary salt being formed insitu. It was shown that the deprotonation of ROH takes place at the interface, since there was no OH− extraction in organic medium and the yield depends on the sti

APA, Harvard, Vancouver, ISO, and other styles

24

Mąkosza, Mieczysław, and Michał Fedoryński. "Interfacial Processes—The Key Steps of Phase Transfer Catalyzed Reactions." Catalysts 10, no. 12 (2020): 1436. http://dx.doi.org/10.3390/catal10121436.

Full text

Abstract:

After short historical introduction, interfacial mechanism of phase transfer catalyzed (PTC) reactions of organic anions, induced by aqueous NaOH or KOH in two-phase systems is formulated. Subsequently experimental evidence that supports the interfacial deprotonation as the key initial step of these reactions is presented.

APA, Harvard, Vancouver, ISO, and other styles

25

Capobianco, Amedeo, Antonia Di Mola, Valentina Intintoli, et al. "Asymmetric tandem hemiaminal-heterocyclization-aza-Mannich reaction of 2-formylbenzonitriles and amines using chiral phase transfer catalysis: an experimental and theoretical study." RSC Advances 6, no. 38 (2016): 31861–70. http://dx.doi.org/10.1039/c6ra05488a.

Full text

Abstract:

The first asymmetric synthesis of 3-amino-substituted isoindolinones was accomplished via cascade hemiaminal-heterocyclization-intramolecular aza-Mannich reaction of amines and 2-formylbenzonitriles using chiral phase transfer conditions (PTC).

APA, Harvard, Vancouver, ISO, and other styles

26

Woo, Seunga, Yong-Gyun Kim, Baegeun Lim та ін. "Dimeric cinchona ammonium salts with benzophenone linkers: enantioselective phase transfer catalysts for the synthesis of α-amino acids". RSC Advances 8, № 4 (2018): 2157–60. http://dx.doi.org/10.1039/c7ra12499f.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

PIELICHOWSKI, JAN, and PIOTR CZUB. "Synthesis of low-molecular-weight epoxy resins under phase transfer catalysis (PTC) conditions." Polimery 42, no. 02 (1997): 96–99. http://dx.doi.org/10.14314/polimery.1997.096.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Singh, Paramjit, and Geeta Arora. "Organic Synthesis Using Ptc-41: Synthesis of Cyclic Ethers Using Phase Transfer Catalysis." Synthetic Communications 18, no. 11 (1988): 1283–90. http://dx.doi.org/10.1080/00397918808060922.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Kaur, Inderjeet, Simrat Kaur, and Ramesh Dogra. "Biodegradation Studies on Polyethylene Developed through Phase Transfer Catalysed Graft Copolymerisation and Related Polymers." Mapana - Journal of Sciences 2, no. 2 (2004): 92–103. http://dx.doi.org/10.12723/mjs.4.12.

Full text

Abstract:

In an attempt to attempt to modify polyethylene(PE) with a view to impart biodegradability, graft copolymerisation of vinyl monomers (AAm & AAc0 onto PE through phase transfer catalysis has been studied. The % of grafting of AAm & AAc onto PE was found to be dependent of BOP cone, monoer cone, time, temperature & concentration of phase transfer caatalyst. Biodegradation of samples of PE-g-poly(AAm) & PE-g-poly (AAc) prepared by different methods of grafting such as chemical, UV, gamma-radiation induced & by PTC methods showed beeter results of biodegradation as compared to

APA, Harvard, Vancouver, ISO, and other styles

30

Disetti, Paolo, Maria Moccia, Diana Salazar Illera, Surisetti Suresh, and Mauro F. A. Adamo. "Catalytic enantioselective addition of isocyanoacetate to 3-methyl-4-nitro-5-styrylisoxazoles under phase transfer catalysis conditions." Organic & Biomolecular Chemistry 13, no. 43 (2015): 10609–12. http://dx.doi.org/10.1039/c5ob01880c.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Jiang, Guanyu, Xinduo Sun, Fanrui Zhou, Kun Liang, and Qian Chen. "Chiral Quaternary Ammoniums Derived from Dehydroabietylamine: Synthesis and Application to Alkynylation of Isatin Derivatives Catalyzed by Silver." Catalysts 11, no. 12 (2021): 1479. http://dx.doi.org/10.3390/catal11121479.

Full text

Abstract:

Abietic acid and its derivatives have broadly been used in fine chemicals and are renewable resources. Its inherent chiral rigid tricyclic phenanthrene skeleton is unique. Its utilities in asymmetric catalysis remain to be explored. A series new amide-type chiral quaternary ammoniums bearing dehydroabietylamine were designed, and prepared by two convenient steps. Acylation of dehydroabietylamine with bromoacetyl chloride afforded amide holding bromoacetyl group in higher yields using triethyl amine as base. Subsequent quaternization reaction gave the desired amide-type chiral quaternary ammoni

APA, Harvard, Vancouver, ISO, and other styles

32

Atchekzaï, Jean, Bernard Bonnetot, Henri Mongeot, Sami Boufi, and Bernard Frange. "The reaction of boron trichloride – tertiary amine adducts with pseudohalide salts under phase transfer catalysis conditions." Canadian Journal of Chemistry 70, no. 10 (1992): 2520–25. http://dx.doi.org/10.1139/v92-319.

Full text

Abstract:

The reaction of boron trichloride – tertiary amine adducts D•BCl3 with pseudohalide salts MX was investigated in a homogeneous medium or in two-phase systems under liquid/liquid or solid/liquid phase transfer catalysis conditions (PTC) as a potential route to the adducts D•BX3 (X = NCS, NCO). Best results were obtained with solid/liquid PTC with tetraglyme as catalyst. By suitable choice of the tertiary amine, solvent, and stoichiometry, the symmetric compounds D•BX3 were thus prepared with good yields, the same reaction leading either to mixed species D•BX3-nCln (n = 1, 2; X = NCS, NCO) or to

APA, Harvard, Vancouver, ISO, and other styles

33

Jonczyk, Andrzej. "Application of phase-transfer catalysis (PTC) to reactions of C-H acids with chloroethylenes." Arkivoc 2004, no. 3 (2004): 176–84. http://dx.doi.org/10.3998/ark.5550190.0005.315.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Jończyk, Andrzej, Tomasz Kuliński, Maciej Czupryniak, and Paweł Balcerzak. "A Simple Synthesis of Ethynyl Substituted Phenylacetonitrile Derivatives by Phase-Transfer Catalysis (PTC)1." Synlett 1991, no. 09 (1991): 639–41. http://dx.doi.org/10.1055/s-1991-22018.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Alkorta, Ibon, José Elguero, and Roger Gallo. "A theoretical study of the limits of the acidity of carbon acids in phase transfer catalysis in water and in liquid ammonia." Open Chemistry 11, no. 11 (2013): 1711–22. http://dx.doi.org/10.2478/s11532-013-0311-7.

Full text

Abstract:

AbstractThe acidities of a large number of carbon acids have been theoretically calculated for the gas-phase and for DMSO solution. The gas-phase values, both ΔH and ΔG, are very well correlated with the available experimental data. From the calculated ΔG values in DMSO and the pKas in the same solvent, a homogeneous set of pK a (DMSO) values was devised that was used to generate pK a (water). These last pK as were used to establish the limits of the acidity of carbon acids for reactions under PTC conditions both alkylations and H/D exchange. A step further led to the pK as in liquid ammonia a

APA, Harvard, Vancouver, ISO, and other styles

36

Dehmlow, Eckehard V., and Gagik O. Torossian. "Notizen: Regioselectivity Control of Thiocyanate Benzylation by the Structure of Phase Transfer Catalysts [1]." Zeitschrift für Naturforschung B 45, no. 7 (1990): 1091–92. http://dx.doi.org/10.1515/znb-1990-0731.

Full text

Abstract:

Solid/liquid phase transfer catalytic conversions of KSCN and benzyl chloride at 180 °C give thiocyanate/isothiocyanate ratios depending on catalyst structure. Liquid/liquid PTC at 100 °C yields thiocyanate exclusively.

APA, Harvard, Vancouver, ISO, and other styles

37

O'Donnell, Martin J., Jeremy D. Keeton, Vien Van Khau та John C. Bollinger. "The regioselective α-alkylation of the benzophenone imine of glycinamide, alaninamide, and related derivatives". Canadian Journal of Chemistry 84, № 10 (2006): 1301–12. http://dx.doi.org/10.1139/v06-088.

Full text

Abstract:

The benzophenone imine of glycinamide was alkylated using ion pair extraction (RX, 10% aq. NaOH, Bu4NHSO4 (1 equiv.), CH2Cl2, rt) to give the α-monosubstituted products, which were then alkylated a second time using stronger basic conditions (KO-t-Bu, THF, 0 °C, RX). Crystal structures of the Schiff bases of glycinamide, an α-monosubstituted and an α,α-disubstituted product were reported.Key words: benzophenone imines, Schiff bases, alkylation, ion pair extraction (IPE), phase-transfer catalysis (PTC), anhydrous base, X-ray crystal structures.

APA, Harvard, Vancouver, ISO, and other styles

38

Arct, Jacek, Michał Fedoryński, Kazimierz Minksztym, and Andrzej Jończyk. "Synthesis of 1-(1-Cyano-1-phenyl)alkyl-2-phenylcyclopropenes by Phase-Transfer Catalysis (PTC)." Synthesis 1996, no. 09 (1996): 1073–75. http://dx.doi.org/10.1055/s-1996-4336.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Tundo, P., F. Trotta, and G. Moraglio. "Reactions of dimethyl carbonate with nucleophiles under gas-liquid phase-transfer catalysis (GL-PTC) conditions." Reactive Polymers 10, no. 2-3 (1989): 185–88. http://dx.doi.org/10.1016/0923-1137(89)90025-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Nawrot, Ewelina, and Andrzej Jończyk. "Difluoromethylation of some C–H acids with chlorodifluoromethane under conditions of phase transfer catalysis (PTC)." Journal of Fluorine Chemistry 130, no. 5 (2009): 466–69. http://dx.doi.org/10.1016/j.jfluchem.2009.02.008.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Shinde, Sandip S., Kim-Viktoria Bolik, Simone Maschauer, and Olaf Prante. "18F-Fluorination Using Tri-Tert-Butanol Ammonium Iodide as Phase-Transfer Catalyst: An Alternative Minimalist Approach." Pharmaceuticals 14, no. 9 (2021): 833. http://dx.doi.org/10.3390/ph14090833.

Full text

Abstract:

The 18F syntheses of tracers for positron emission tomography (PET) typically require several steps, including extraction of [18F]fluoride from H2[18O]O, elution, and drying, prior to nucleophilic substitution reaction, being a laborious and time-consuming process. The elution of [18F]fluoride is commonly achieved by phase transfer catalysts (PTC) in aqueous solution, which makes azeotropic drying indispensable. The ideal PTC is characterized by a slightly basic nature, its capacity to elute [18F]fluoride with anhydrous solvents, and its efficient complex formation with [18F]fluoride during su

APA, Harvard, Vancouver, ISO, and other styles

42

Yadav, Ganapati D., and Priyal M. Bisht. "Novelties of microwave irradiated solid–liquid phase transfer catalysis (MISL-PTC) in synthesis of 2′-benzyloxyacetophenone." Journal of Molecular Catalysis A: Chemical 221, no. 1-2 (2004): 59–69. http://dx.doi.org/10.1016/j.molcata.2004.07.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Jończyk, Andrzej, and Krzysztof Michalski. "A New Reaction of N-substituted Formamides with Trichloroethylene under Conditions of Phase-Transfer Catalysis (PTC)." Synlett, no. 10 (2002): 1703–5. http://dx.doi.org/10.1055/s-2002-34223.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Fini, Francesco, Gabriele Micheletti, Luca Bernardi, Daniel Pettersen, Mariafrancesca Fochi та Alfredo Ricci. "An easy entry to optically active α-amino phosphonic acid derivatives using phase-transfer catalysis (PTC)". Chemical Communications, № 36 (2008): 4345. http://dx.doi.org/10.1039/b807027j.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Loupy, André, Alain Petit, Mohamed Ramdani, et al. "The synthesis of esters under microwave irradiation using dry-media conditions." Canadian Journal of Chemistry 71, no. 1 (1993): 90–95. http://dx.doi.org/10.1139/v93-013.

Full text

Abstract:

Practical and simple techniques are described for using nonmodified domestic microwave ovens as safe and convenient laboratory devices to obtain numerous esters. High pressures are avoided by conducting reactions with reactants impregnated on solid mineral supports in "dry media" or by phase transfer catalysis (PTC) in the absence of organic solvents. Two kinds of microwave effects are involved: (1) displacement of the equilibrium by evaporation of volatile polar molecules (water or alcohols) in esterifications and transesterifications; (2) acceleration of ionic reactions in carboxylate alkyla

APA, Harvard, Vancouver, ISO, and other styles

46

Jończyk, Andrzej, Tomasz Koćmierowski, and Tadeusz Zdrojewski. "Phase-transfer catalysed (PTC) reactions of 1,1-dichloro-2-cyanocyclopropane with nucleophiles. Identification of intermediates." New Journal of Chemistry 27, no. 2 (2002): 295–99. http://dx.doi.org/10.1039/b205995a.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Li, Weihua, Yifeng Wang та Danqian Xu. "Asymmetric synthesis of β-amino ketones by using cinchona alkaloid-based chiral phase transfer catalysts". Organic & Biomolecular Chemistry 16, № 45 (2018): 8704–9. http://dx.doi.org/10.1039/c8ob02484g.

Full text

Abstract:

A highly enantioselective nucleophilic addition of ketones to versatile imines catalyzed by chiral PTC has been developed, and the process affords the Mannich reaction products with tertiary stereocenters in good to high yields and excellent enantioselectivities. This protocol is effective for gram scale reaction.

APA, Harvard, Vancouver, ISO, and other styles

48

Bhaskar Reddy, Dandu, Biradavolu Seenaiah, Adivireddi Padmaja, and Pallela Venkata Ramana Reddy. "Synthesis of Some New Bis[1-(2-aroyl-3-aryl)cyclopropylcarbonyl]benzenes and Pyridines under Phase Transfer Catalysis (PTC) Method." Collection of Czechoslovak Chemical Communications 58, no. 6 (1993): 1437–44. http://dx.doi.org/10.1135/cccc19931437.

Full text

Abstract:

Some new bis[1-(2-aroyl-3-aryl)cyclopropylcarbonyl]benzenes and pyridines IV - VI have been prepared by the cycloaddition of dimethylsulfonium phenacylide to 1,1'-(1,3-, 1,4-phenylene, and 2,6-pyridylene)-bis(3-aryl-2-propen-1-ones) I - III by adopting two different methods. The advantages of the PTC method over the other have been discussed. The structures of the compound have been confirmed by spectral data.

APA, Harvard, Vancouver, ISO, and other styles

49

Pathak, Vijai N., Bindu Varshney, and Ragini Gupta. "A ‘one pot’ synthesis of 2-aryl-4H-1-benzopyran-4-ones under coupled microwave phase transfer catalysis (PTC) and ultrasonic irradiation PTC." Journal of Heterocyclic Chemistry 45, no. 2 (2008): 589–92. http://dx.doi.org/10.1002/jhet.5570450246.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Myachin, Ilya V., and Leonid O. Kononov. "Phase-Transfer Catalyzed Microfluidic Glycosylation: A Small Change in Concentration Results in a Dramatic Increase in Stereoselectivity." Catalysts 13, no. 2 (2023): 313. http://dx.doi.org/10.3390/catal13020313.

Full text

Abstract:

Phase-transfer catalysis (PTC) is widely used in glycochemistry for the preparation of aryl glycosides by the glycosylation reaction. While investigating the possibility of synthesis of 4-(3-chloropropoxy)phenyl sialoside (Neu5Ac-OCPP) from N-acetylsialyl chloride with O-acetyl groups (1), we have recently discovered a strong dependence of the PTC glycosylation outcome on the mixing mode: under batch conditions, only α-anomer of Neu5Ac-OCPP was obtained, albeit in low yield (13%), while under microfluidic conditions the yield of Neu5Ac-OCPP increased to 36%, although stereoselectivity decrease

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!