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Relevant bibliographies by topics / Lawessons reagent

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Academic literature on the topic 'Lawessons reagent'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Lawessons reagent"

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Eychenne, Val rie, and Zphirin Mouloungui. "Convenient thionation of triglycerides with lawessons reagent." Journal of the American Oil Chemists' Society 78, no. 3 (2001): 229–34. http://dx.doi.org/10.1007/s11746-001-0250-y.

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Foreman, Mark St J., Alexandra M. Z. Slawin, and J. Derek Woollins. "The preparation of a solubilized form of Lawessons reagent and its thionation reactions." Heteroatom Chemistry 10, no. 7 (1999): 651–57. http://dx.doi.org/10.1002/(sici)1098-1071(1999)10:7<651::aid-hc21>3.0.co;2-7.

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Foreman, Mark St J., Alexandra M. Z. Slawin, and J. Derek Woollins. "ChemInform Abstract: The Preparation of a Solubilized Form of Lawessons Reagent and Its Thionation Reactions." ChemInform 31, no. 10 (2010): no. http://dx.doi.org/10.1002/chin.200010067.

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Wood, Paul T., and J. Derek Woollins. "The preparation of M(PR3)2 (S2(S)PC6H4OMe) (M=Ni, Pd, Pt) from Lawessons reagent." Transition Metal Chemistry 12, no. 5 (1987): 403–5. http://dx.doi.org/10.1007/bf01171647.

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NAGAOKA, Joji. "Lawesson's Reagent." Journal of Synthetic Organic Chemistry, Japan 53, no. 12 (1995): 1138–40. http://dx.doi.org/10.5059/yukigoseikyokaishi.53.1138.

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El-Sayed, Naglaa F., Ewies F. Ewies, Marwa El-Hussieny, Leila S. Boulos, and ElSayed M. Shalaby. "Synthesis of novel pyrazole derivatives using organophosphorus, stibine, and arsine reagents and their antitumor activities." Zeitschrift für Naturforschung B 71, no. 7 (2016): 765–76. http://dx.doi.org/10.1515/znb-2015-0187.

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AbstractThe reactions of 5-azido-3-methyl-1-phenyl-1H-pyrazole-4-carbaldehyde (azidopyrazole) with several classes of organophosphorus reagents: phosphonium ylides, Wittig-Horner reagents, dialkylphosphonates, trialkylphosphites, tris(dialkylamino)phosphanes, triphenylstibane, triphenylarsane, and Lawesson’s reagent are reported. Structural reasoning for the new products was based on compatible analytical and spectral data. The cytotoxic activity of most of the new products was evaluated against human breast carcinoma cell line (MCF7) and human hepatocellular carcinoma cell line(HepG2). Certain tested compounds showed promising results.

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Bergman, Jan. "Comparison of Two Reagents for Thionations." Synthesis 50, no. 12 (2018): 2323–28. http://dx.doi.org/10.1055/s-0036-1591989.

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Pyridine reacts readily with P4S10 to form a reagent with the composition C10H10N2P2S5 that is useful for thionations of amides. The thionating properties of this reagent are compared with those of Lawesson’s reagent.1 Introduction2 Development of C10H10N2P2S5 3 Use of Thionation for Modification of Biologically Active Compounds3.1 Thionations of Peptides3.2 Thionated Compounds of Interest as Potential Antivirals3.3 Thionations of Thalidomide and Related Molecules4 Comparison of Lawesson’s Reagent and C10H10N2P2S5

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Boulos, Leila S., Hoda A. Abdel-Malek, and Naglaa F. El-Sayed. "Synthesis of Novel Benzosuberone Derivatives using Organophosphorus Reagents and their Antitumor Activities." Zeitschrift für Naturforschung B 67, no. 3 (2012): 243–52. http://dx.doi.org/10.1515/znb-2012-0311.

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2-Arylidenebenzosuberones react with a Wittig-Horner reagent in the presence of sodium hydride as a base to give the novel dimethyl (4-(4-methoxyphenyl)-2-oxa-2,3,4,5,6,7-hexahydrobenzo- [6,7]cyclohepta[1,2-b]pyran-3-yl)phosphonate. On the other hand, 6,7-dihydrobenzo[6,7]cyclohepta- [1,2-b]pyran-2(5H)-ones were isolated from the reaction of 2-arylidenebenzosuberones withWittig- Horner reagents using alcoholic sodium alkoxide. The reaction of 2-arylidenebenzosuberones with trialkyl phosphites affords the alkyl phosphonate derivatives. Tris(dialkylamino)phosphines react with 2-arylidenebenzosuberones to give the oxaphospholanoxide products. 2-Arylidenebenzosuberones react with Lawesson’s reagent to yield the corresponding dimers. Some of the prepared products were screened for antitumor activity

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El-Samahy, Fatma A., Marwa El-Hussieny, Naglaa F. El-Sayed, Elsayed M. Shalaby, and Fayez H. Osman. "Synthesis and Pharmacological Evaluation of a Novel Series of Cyclopentenone Derivatives." Journal of Chemical Research 41, no. 1 (2017): 50–56. http://dx.doi.org/10.3184/174751917x14837116219654.

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A novel series of cyclopent-2-enone derivatives have been synthesised by the reaction of 4-hydroxy-3,4-diphenylcyclopent-2-enone, cyclic secondary amines, phosphorus reagents, hexamethylphosphoramide and Lawesson's reagent in boiling toluene/THF. The chemical structures of new compounds were identified by 1H NMR, 13C NMR, 31P NMR and mass spectra. Furthermore, the structure of one of the synthesised compounds has been confirmed using single crystal X-ray diffraction. The pharmacological evaluation results of antilung and anticolon carcinoma cell line properties for the products are discussed.

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Wu, Ke, Yichen Ling, An Ding, et al. "A chromatography-free and aqueous waste-free process for thioamide preparation with Lawesson’s reagent." Beilstein Journal of Organic Chemistry 17 (April 9, 2021): 805–12. http://dx.doi.org/10.3762/bjoc.17.69.

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After completing the thio-substitution with Lawesson’s reagent, ethanol was found to be effective in the decomposition of the inherent stoichiometric six-membered-ring byproduct from the Lawesson’s reagent to a highly polarized diethyl thiophosphonate. The treatment significantly simplified the following chromatography purification of the desired thioamide in a small scale preparation. As scaling up the preparation of two pincer-type thioamides, we have successfully developed a convenient process with ethylene glycol to replace ethanol during the workup, including a traditional phase separation, extraction, and recrystallization. The newly developed chromatography-free procedure did not generate P-containing aqueous waste, and only organic effluents were discharged. It is believed that the optimized procedure offers the great opportunity of applying the Lawesson’s reagent for various thio-substitution reactions on a large scale.

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Dissertations / Theses on the topic "Lawessons reagent"

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Schmidt, Michael Joseph. "A New Late-Stage Lawesson's Cyclization Strategy Towards the Synthesis of Aryl 1,3,4-Thiadiazole-2-Carboxylate Esters." Kent State University Honors College / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1373911614.

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Tice, Nathan Charles. "THE SYNTHESIS, STRUCTURE, AND REACTIVITY OF SOME ORGANOMETALLIC-FUSED HETEROCYCLES." UKnowledge, 2006. http://uknowledge.uky.edu/gradschool_diss/297.

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The synthesis, structure, and reactivity of some organometallic-fusedheterocycles were studied. This work was divided into three parts: first,thiapentalenyl tricarbonyl manganese complexes [Mn(CO)3{??5-SC7H3-1,3-(R)2}]were synthesized employing thiation on diacyl precursors; second, attempts toform the 5,5-fused ring pyrrole analogs to the thiapentalenyl complexes led to theformation of various amine and imine ligands and manganese complexes, but notthe desired ring-closed pyrroles; third, reductive amination on a ferrocenylmonoaldehyde substrate led to the formation of di(N-(ferrocenylmethyl))-Nmethylamineand its cyanoborane and cyanoborohydride analogs.Isolation of the desired thiapentalenyl manganese complexes wasaccomplished by first forming 1,2-diacylcyclopentadienes (fulvenes), convertingto the corresponding thallium salts [Tl{1,2-C5H3(COR)2}] employing thalliumethoxide, transmetallating with [Mn(CO)5Br], and ring closing using either P4S10or Lawesson's Reagent. Ring closure from the diacylmanganese complexes[Mn(CO)3{??5-1,2-C5H3(COR)2}] gave air stable thiapentalenyl complexes inmoderate to good yield and was tolerable to a variety of functional groups (aryl,arylacetyl, t-butyl). In the cases where 1,2-diarylacetyl complexes wereemployed, the isolated products were "quinoidal". While ring closure on thecorresponding diacylrhenium tricarbonyl complexes was not feasible, it wasobserved that these quinoidal thiapentalenyl structures could be formed on aruthenium Cp* moiety using the arylacetyl fulvenes.Various keto-amines or enol-imines could be formed from the 1,2-dibenzoyl fulvene employing primary amines (R = H, Me, OH, OMe). In thepresence of a reducing agent, neither reduction nor ring closure was observedfor any of the cases investigated. Formation of the corresponding manganesetricarbonyl complex for the methyoxyimine case was accomplished by reaction ofthe enol-methoxyimine with thallium ethoxide and then transmetallating with[Mn(CO)5Br]. Reaction of this keto-imine complex with various reducing agentsdid not lead to the desired 5,5-fused ring pyrrole complex but to reduction to thecorresponding alcohol.Diferrocenylmethyl methylamine complexes were obtained by reaction offerrocene monoaldehyde with ferrocenylmethyl methylamine in the presence of amild reducing agent (NaCNBH3). Isolation under anhydrous conditions gave theunexpected cyanoborohydride salt, di(N-(ferrocenylmethyl))-N-methylammoniumcyanoborohydride. Aqueous work-up gave the corresponding free amine.Conversion of the cyanoborohydride salt to the corresponding cyanoborane,di(N-(ferrocenylmethyl))-N-methylammonium–cyanoborane, was accomplishedby refluxing the cyanoborohydride salt in THF.

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Mingle, David. "Synthesis, Characterization and Biological Evaluation of Novel (S,E)-11-[2-(Arylmethylene) Hydrazono] Pyrrolo [2,1-c] [1,4] Benzodiazepine Derivatives." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/etd/3596.

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Pyrrolo [2,1-c] [1,4] benzodiazepine (PBD) is a class of natural products obtained from various actinomycetes which have both anti-tumor and antibiotic activities and can bind to specific sequences of DNA. PBD-dilactam was initially produced using isatoic anhydride and (L)-proline which was then converted to the PBD-thiolactam using Lawesson's reagent. Reaction of thiolactam with hydrazine in ethanol afforded PBD-11-hydrazinyl. Condensation of 11-hydrazinyl PBD with aldehydes possessing various substitutions was performed to obtain (S,E)-11-[2-(arylmethylene) hydrazono] pyrrolo [2,1-c] [1,4] benzodiazepine derivatives. 1HNMR, 13C-NMR, DEPT, IR, GC-MS and X-ray crystallography were used for the characterization. Inhibition activity of the products were carried out using TEM-1, AmpC and P99 β-lactamases. A minimal inhibition growth of 25% was observed for one of the selected PBDs on cancer cell line. A promising result was observed on preliminary cannabinoid binding activity test on one of the compounds.

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4

Shin, Younghun. "Modifying naphthalene diimide copolymers for applications in thermoelectric devices." 2020. https://monarch.qucosa.de/id/qucosa%3A71753.

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The aim of this thesis is to modify and improve the n-type semiconducting polymer PNDIT2 for thermoelectric generators (TEGs) applications. Although the PNDIT2 is considered a prime n-type material due to its high electron mobility, low air-stability of radical anions after doping and the low doping efficiency with molecular dopants are severe drawbacks and lead to limited application in TEGs. To this end, the backbone structure of PNDIT2 is modified by polymer analogous thionation and the branched aliphatic side chains are replaced by branched, fully oligoethylene glycol-based side chains. PNDIT2 was prepared by DAP and subjected to various conditions of thionation. The polymer analogous thionation of PNDIT2 was done by using Lawesson´s reagent (LR). The O/S conversion was controlled by solvent, T and amount of LR. For an excess of LR, only two carbonyls out of four present in the NDI repeating unit are converted to thiocarbonyls with regioselective trans-conformation (2S-trans-PNDIT2). Chlorobenzene (CB) is an excellent solvent in which the highest O/S conversion was achieved and the best reproducibility. Tri- or tetra- substitution in one NDI repeat unit did not take place due to steric hinderance of T2 comonomer. Thionation affected all properties. The lower thermal stability, UV-vis spectra were bathochromically shifted and a new band of the thionated NDI unit appeared. Chain aggregation was stronger as probed by UV-vis and NMR spectroscopy. The LUMO energy level of 2S-trans-PNDIT2 was lowered by 0.2 eV, giving -4.0 eV. This is at the border of what is needed for air stability of radical anions. The scattering on thin films indicated lower order and less crystalline textures of 2S-trans-PNDIT2 compared to PNDIT2. Likewise, electron mobility decreased with increasing conversion. While chapter 2 focused on the synthesis, opto-electronic and thermal properties of 2S-trans-PNDIT2, chapter 3 was concerned with details on morphology and electrical properties. To this end, 2S-trans-PNDIT2 was doped by N-DPBI in toluene at various concentrations and conductivities were determined. Undoped 2S-trans-PNDIT2 exhibited one order of magnitude higher conductivity than pristine PNDIT2. After doping with 5 wt.-% N-DPBI, the conductivity of 2S-trans-PNDIT2 increased by two orders of magnitude and reached a maximum conductivity of 6*10-3 S/cm at 15 wt.-% doping. This value was approx.5 times higher than the conductivity of PNDIT2 at the same doping level. Furthermore, the stability of conductivity of doped 2S-trans-PNDIT2 under ambient conditions was investigated and compared to PNDIT2. Upon exposure air (50 % humidity), conductivity of PNDIT2 rapidly decreased to the pristine film level, while the conductivity of 2S-trans-PNDIT2 was reduced by a factor of less than two after 16 h. While the initially higher conductivity of 2S-trans-PNDIT2 is ascribed to its less crystalline structure and thus higher doping efficacy, its better stability can be ascribed to the lower LUMO energy level. The topic of chapter 4 is on the synthesis of fully ether-based, polar and branched side chains (EO) and introduction into PNDIT2. The advantages of polar side chains over aliphatic side chains have been reported. However, previously reported PNDIT2 with linear polar side chains is limited in MW due to solubility. The EO side chain with amine functionality was synthesized in three steps and used for monomer synthesis (EO-NDIBr2). Initial efforts to use DAP to prepare P(EO-NDIT2) from EO-NDIBr2 and pristine bithiophene gave only oligomeric products. Stille polycondensation was therefore used, giving high MW. As extreme aggregation occurred in solvents used for GPC, absolute MW were determined by 1H NMR spectroscopy. To enable reliable end group analysis, model compounds with methyl end groups were prepared. In P(EO-NDIT2), methyl end groups are dominating as a result of incorrect transmetalation from the stannylated monomer. The end groups seen by 1H NMR spectroscopy were further confirmed by MALDI-ToF. Absolute MW were between Mn,NMR= 11 kg/mol to 116 kg/mol depending on reaction conditions. Aggregation was further probed by UV-vis and NMR spectroscopy as a function of the solvent and temperature, shining light into the degree of aggregation, which is important for thin film preparation. Solvent quality decreased with the following order: CHCl3, 1-Chloronaphthalene (CN), 1,2-Dichlorobenzene (o-DCB), DMF, 1,4-Dioxane, CB and Anisole (AN). According to these results, three doping protocols based on CB and o-DCB, as well as temperature variations, were used to prepare films for conductivity measurements. The best results were obtained for processing from chlorobenzene at 80 °C, which aggregates are dissolved. Strikingly, maximum conductivity values were achieved already for 5 wt.-% dopant concentration. The PF reached a maximum even for 1 wt.-% doping level. This unusually low value is promising and suggests a high doping efficacy.

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Books on the topic "Lawessons reagent"

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Kaur, Navjeet. Lawesson’s Reagent in Heterocycle Synthesis. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-4655-3.

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Book chapters on the topic "Lawessons reagent"

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Li, Jie Jack. "Lawesson’s reagent." In Name Reactions. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04835-1_162.

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Li, Jie Jack. "Lawesson’s reagent." In Name Reactions. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01053-8_145.

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Li, Jie Jack. "Lawesson’s reagent." In Name Reactions. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03979-4_155.

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Li, Jie Jack. "Lawesson’s reagent." In Name Reactions. Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05336-2_173.

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Li, Jie Jack. "Lawesson’s Reagent." In Name Reactions. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-50865-4_83.

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Kaur, Navjeet. "Five-Membered N-Heterocycle Synthesis." In Lawesson’s Reagent in Heterocycle Synthesis. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4655-3_1.

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Kaur, Navjeet. "Thiadiazole Synthesis." In Lawesson’s Reagent in Heterocycle Synthesis. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4655-3_4.

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Kaur, Navjeet. "S-Heterocycle Synthesis." In Lawesson’s Reagent in Heterocycle Synthesis. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4655-3_6.

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Kaur, Navjeet. "Five-Membered S-Heterocycle Synthesis." In Lawesson’s Reagent in Heterocycle Synthesis. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4655-3_5.

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Kaur, Navjeet. "Phosphorus Pentasulfide in Heterocycle Synthesis." In Lawesson’s Reagent in Heterocycle Synthesis. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4655-3_8.

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Conference papers on the topic "Lawessons reagent"

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U. Pandit, Vikram, Sudhir S. Arbuj, Uttam P. Mulik, Suresh W. Gosavi, and Bharat B. Kale. "Synthesis of CdS nanostructure by Lawesson? reagent for photocatalytic water splitting." In Proceedings of the International Conference on Nanotechnology for Better Living. Research Publishing Services, 2016. http://dx.doi.org/10.3850/978-981-09-7519-7nbl16-rps-199.

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Raposo, M., Ana Sampaio, and G. Kirsch. "Synthesis of Arylamino-thieno-oxobutanamides and Reactivity Studies on the Cyclisation with the Lawesson's Reagent." In The 8th International Electronic Conference on Synthetic Organic Chemistry. MDPI, 2004. http://dx.doi.org/10.3390/ecsoc-8-01947.

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Montaño, Rocío, and Murali Venkata Unnamatla. "Efficient and rapid conversion of 3-amino imidazo[1,2-a] pyridin-2-yl)-4H-chromene-4-ones to its corresponding thio analogues using Lawesson’s reagent ." In The 22nd International Electronic Conference on Synthetic Organic Chemistry. MDPI, 2018. http://dx.doi.org/10.3390/ecsoc-22-05668.

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