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Journal articles on the topic 'Sulphur Heterocycles'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Sharma, Praveen K., Andleeb Amin, and M. Kumar. "A Review: Medicinally Important Nitrogen Sulphur Containing Heterocycles." Open Medicinal Chemistry Journal 14, no. 1 (2020): 49–64. http://dx.doi.org/10.2174/1874104502014010049.

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Nitrogen sulphur containing heterocycles have specific properties due to which they can be used as a potential material in a different type of industries such as medicinal/pharmaceutical, paint, packing and textile, required for various chemical, physical operations and their use as products. Especially dyes, paint, agrochemicals, medicine, etc. make them more significant. In present days, Nitrogen-Sulfur heterocycles are repeatedly attracting the interest of chemists due to their exceptional bioactive behavior. The present study is a review of the work carried out by a chemist in the discover

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2

Sharma, Praveen Kumar, Andleeb Amin, and M. Kumar. "Synthetic Methods of Medicinally Important Heterocycles-thiazines: A Review." Open Medicinal Chemistry Journal 14, no. 1 (2020): 71–82. http://dx.doi.org/10.2174/1874104502014010071.

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Heterocyclic compounds containing N and S atoms have unique properties so that they can be used as potential reactive materials in pharmacokinetic systems. In medicinal chemistry, the therapeutic applications of nitrogen sulphur heterocycles are well known. Especially, Thiazines attract the attention of chemists due to their great bioactive behavior. The present study is a review of the work carried out by the research community for the synthesis of novel, effective, medicinally important heterocyclic compounds-thiazines.

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3

Maji, Pradip Kumar. "Synthesis of Pyrimidine-Annulated Five-Membered Heterocycles: An Overview." Current Organic Chemistry 23, no. 20 (2019): 2204–69. http://dx.doi.org/10.2174/1385272823666191019111627.

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This review describes the non-exhaustive scenery of the synthesis of various biologically interesting pyrimidine annulated five-membered heterocyclic ring systems that have been appeared in the literature during the last two decades. During this period, different synthetic routes and various methodologies have been developed for the functionalization of pyrimidine ring towards the construction of five-membered heterocyclic rings. The aim of this review is to give an overview of the assorted methodologies that have been reported about the chemistry of construction of pyrimidines annulated nitro

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4

Ribeiro da Silva, M. A. V., and Ana Filipa L. O. M. Santos. "Energetics of some sulphur heterocycles." Journal of Thermal Analysis and Calorimetry 95, no. 2 (2009): 333–44. http://dx.doi.org/10.1007/s10973-008-9583-0.

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5

Masdeu, Carme, Maria Fuertes, Endika Martin-Encinas, et al. "Fused 1,5-Naphthyridines: Synthetic Tools and Applications." Molecules 25, no. 15 (2020): 3508. http://dx.doi.org/10.3390/molecules25153508.

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Heterocyclic nitrogen compounds, including fused 1,5-naphthyridines, have versatile applications in the fields of synthetic organic chemistry and play an important role in the field of medicinal chemistry, as many of them have a wide range of biological activities. In this review, a wide range of synthetic protocols for the construction of this scaffold are presented. For example, Friedländer, Skraup, Semmlere-Wolff, and hetero-Diels-Alder, among others, are well known classical synthetic protocols used for the construction of the main 1,5-naphthyridine scaffold. These syntheses are classified

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6

Muhuri, Sanjukta, and Habibur Rahaman. "Recent Developments in Synthesis of Sulfur Heterocycles via Copper-Catalyzed C-S Bond Formation Reaction." Asian Journal of Organic & Medicinal Chemistry 7, no. 2 (2022): 143–52. http://dx.doi.org/10.14233/ajomc.2022.ajomc-p383.

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In a large number of biologically active natural products and pharmaceuticals, the important substructures are sulfur containing heterocycles. Thioethers and other sulphur-rich molecules commonly occur in chemical biology, organic synthesis and material chemistry. In case of the formation of carbon-heteroatom bonds, copper catalyzed cross-coupling reactions provide a powerful tool as its cost is low and here the readily accessible and stable ligands are used. It has been recognized that copper catalyzed C–S coupling reactions are an efficacious strategy for synthesizing sulfur-rich heterocycli

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7

Moulis, Pierre, Cécile Miot-Sertier, Laure Cordazzo, et al. "Which microorganisms contribute to mousy off-flavour in our wines?" OENO One 57, no. 2 (2023): 177–87. http://dx.doi.org/10.20870/oeno-one.2023.57.2.7481.

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In recent years, the frequency of occurrence of mousy off-flavours in wines has increased. This could be caused by the significant decrease in sulphur dioxide addition during processing, the increase in pH or even the trend for spontaneous fermentation in wine. This off-flavour was associated with Brettanomyces bruxellensis or lactic acid bacteria metabolisms. Three N-heterocyclic compounds (APY, ETHP, ATHP) were described as involved in mousiness perception. Thus far, no study addressed the variability in that N-heterocycles production according to microorganism strains from different species

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8

Hitesh, Hitesh Amrutlal. "Synthesis, Characterization and Antifungal Activity of Novel Thiazolo-Pyrimidine Fused Heterocycles." ECS Transactions 107, no. 1 (2022): 1165–72. http://dx.doi.org/10.1149/10701.1165ecst.

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In medicinal chemistry, nitrogen and sulphur containing heterocyclic compounds are well known for their therapeutic properties.(1) Among them thiazole and pyrimidine derivatives possess diverse pharmaceutical activities.(2,3) More particularly thiazolo-pyrimidine fused shows various therapeutically activities like, anticancer, antimicrobial, antibacterial effects, antiviral ,etc (4-7). Such type of fused heterocycles containing furan and naphthalene moieties has not been developed. Thus, the aim of the present work to study the novel fused thiazolo-pyrimidine derivatives, their characterizatio

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9

Nishioka, Masaharu, Milton L. Lee, and Raymond N. Castle. "Sulphur heterocycles in coal-derived products." Fuel 65, no. 3 (1986): 390–96. http://dx.doi.org/10.1016/0016-2361(86)90301-7.

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10

Pawliczek, Martin, Lennart K. B. Garve, and Daniel B. Werz. "Exploiting amphiphilicity: facile metal free access to thianthrenes and related sulphur heterocycles." Chemical Communications 51, no. 44 (2015): 9165–68. http://dx.doi.org/10.1039/c5cc01757b.

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11

Shen, Pingchuan, Zeyan Zhuang, Zujin Zhao, and Ben Zhong Tang. "AIEgens based on main group heterocycles." Journal of Materials Chemistry C 6, no. 44 (2018): 11835–52. http://dx.doi.org/10.1039/c8tc02956c.

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12

Beckett, Michael A., and Paul R. Minton. "Synthesis ofB-Aryl Boron-Sulphur Heterocycles from Arylborondibromides." Phosphorus, Sulfur, and Silicon and the Related Elements 93, no. 1-4 (1994): 461–62. http://dx.doi.org/10.1080/10426509408021904.

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13

Ram, Vishnu J., N. Haque, S. K. Singh, et al. "Synthesis of sulphur heterocycles as hepatoprotectants : part I." Bioorganic & Medicinal Chemistry Letters 4, no. 12 (1994): 1453–56. http://dx.doi.org/10.1016/s0960-894x(01)80512-6.

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14

Soni, Vatsala, Meenakshi Sharma, Vandana Singh, Vaishali Soni, and Kishore D. "Comprehensive Study of Biological Aspects of Heteroring Annelated Benzothiazoles." International Journal of Science, Engineering and Management 9, no. 6 (2022): 1–6. http://dx.doi.org/10.36647/ijsem/09.06.a001.

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Heterocyclic chemicals are chemical structures which include at least a single carbon molecule plus at least one other element, such as sulphur, oxygen, or nitrogen, within the ring structure. Benzothiazoles are discussed in terms of synthesis methodologies, structural changes, chemical reactivity, and possible pharmaceutical effectiveness. This research relied upon secondary data obtained from the sources. The qualitative method was used to provide a section of such an evaluation which looked flawless and accurate. A handy methodology strategy is used in inquiry research. Heterocyclic compoun

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15

Pathania, Shelly, Raj Kumar Narang, and Ravindra K. Rawal. "Role of sulphur-heterocycles in medicinal chemistry: An update." European Journal of Medicinal Chemistry 180 (October 2019): 486–508. http://dx.doi.org/10.1016/j.ejmech.2019.07.043.

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16

Cozzi, Federico, Italo Pellegrini, Gianpiero Adami, Edoardo Reisenhofer, Massimo Bovenzi, and Pierluigi Barbieri. "Sulphur speciation of PM10 samples by XANES spectroscopy." Open Chemistry 7, no. 3 (2009): 395–401. http://dx.doi.org/10.2478/s11532-009-0052-9.

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AbstractSulphur K-edge X-ray absorption near edge structure (XANES) spectroscopy was used to identify sulphur compounds in PM10 samples collected simultaneously at two sites with different environmental situations in the province of Trieste (NE of Italy), during summer and winter seasons respectively. The first site is an industrial site located near a steel mill plant and the second is a coastal site. The sulphur speciation at the industrial site has shown the presence of the following sulphur compounds in both seasons: organic compounds (thiophenes or Polycyclic Aromatic Sulphur Heterocycles

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17

Santhanalakshmi, K., K. Margandan, P. Manivannan, and Rosy P. Jacquline. "Pharmacological significance of Oxadiazole scaffold." Research Journal of Chemistry and Environment 25, no. 8 (2022): 177–88. http://dx.doi.org/10.25303/258rjce177188.

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Heterocycles come under an important branch of organic chemistry that contains at least one atom other than carbon as a part of ring system. The most common hetero atoms that are widely used are nitrogen, oxygen and sulphur. In synthetic organic chemistry, synthesis of heterocyclic compound is of immense interest due to its therapeutic applications and their existence in several natural products like vitamins, hormones, antibiotics and alkaloids. The oxadiazole nucleus is one of the most significant and well known heterocyclic compounds due to its broad range of pharmacological and therapeutic

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18

Ajay, M. Chaturvedi &. Vikas Vijayvargiya. "SYNTHESIZED AND GEOMETRY OPTIMIZATION OF DIFFERENT SUBSTITUTED NITROGEN AND SULPHUR CONTAINING HETEROCYCLES." GLOBAL JOURNAL OF ENGINEERING SCIENCE AND RESEARCHES [FRTSSDS- June 2018] (June 22, 2018): 330–35. https://doi.org/10.5281/zenodo.1296246.

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A series of some novel 2-(5-methyl-1, 3, 4-thiadiazole-2-yl)-1H-Benzimidazole and 2-(1H-benzimidazol-2-yl)-1,3-benzothiazole derivatives were designed and synthesized under microwave irradiation via multistep reaction. The structures of substituted nitrogen and suphur containing heterocycles were confirmed by 1H NMR, MS, IR. The antibacterial activities of substituted nitrogen and suphur containing heterocycles were determined. The antibacterial activity results indicated that the compounds Ib, Ie, and Jd exhibited good activity against Staphylococcus aureus, and the compounds Ic and If displa

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19

Armstrong, Susan K., and Brett A. Christie. "Synthesis of sulphur-containing heterocycles by ring closing diene metathesis." Tetrahedron Letters 37, no. 52 (1996): 9373–76. http://dx.doi.org/10.1016/s0040-4039(97)82967-x.

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20

Khalifa, Mohamed E., and Adel A. Gobouri. "Biological screening and assessment of certain substituted monoazo heterocycles containing sulphur and / or nitrogen and their seleno like moieties." Polish Journal of Chemical Technology 19, no. 4 (2017): 28–35. http://dx.doi.org/10.1515/pjct-2017-0064.

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Abstract The monoazo substituted five membered heterocycles, along with their seleno like moieties are still of interest in organic chemistry due to their medicinal and valuable applications. In continuation of our interest in the study of heterocyclic azo compounds containing sulphur and / or nitrogen heteroatoms, the synthesis of 5-aryl mono azo-thiazol-2-ylcarbamoyl-thiophene along with their seleno like derivatives of pyridine, pyridazine and quinolone, were accomplished. All the synthesized compounds were in vitro screening of their antioxidant activity, antitumor activity against Ehrlich

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21

Zayed, Salem E., and Ibrahim A. Hussin. "Ketoketene gem-dithiols: Synthesis of some sulphur heterocycles as antimicrobial agents." Archives of Pharmacal Research 15, no. 1 (1992): 91–94. http://dx.doi.org/10.1007/bf02973991.

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22

Rednic, Monica Irina, Niculina D. Hădade, Elena Bogdan, and Ion Grosu. "Macrocycles embedding phenothiazine or similar nitrogen and/or sulphur containing heterocycles." Journal of Inclusion Phenomena and Macrocyclic Chemistry 81, no. 3-4 (2014): 263–93. http://dx.doi.org/10.1007/s10847-014-0455-x.

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23

METH-COHN, Otto, and Brian TARNOWSKI. "A Useful Synthon for Sulphur Heterocycles; I. The Synthesis of Thiocoumarins." Synthesis 1978, no. 01 (2002): 56–58. http://dx.doi.org/10.1055/s-1978-24675.

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24

Nevitt, Ian, Henry S. Rzepa, and J. Derek Woollins. "Vibrational spectra of sulphur—nitrogen heterocycles: [S4N3]Cl and [S3N2Cl]Cl." Spectrochimica Acta Part A: Molecular Spectroscopy 45, no. 3 (1989): 367–69. http://dx.doi.org/10.1016/0584-8539(89)80102-3.

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25

Martis, Glanish Jude, Sneha O, and Praveen S. Mugali. "Microwave assisted organic synthesis of nitrogen, oxygen and sulphur containing heterocycles." International Journal of Advanced Chemistry Research 5, no. 2 (2023): 23–27. http://dx.doi.org/10.33545/26646781.2023.v5.i2a.155.

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26

Krstic, Milena, Sofija Sovilj, Suncica Borozan, Milica Rancic, Jelena Poljarevic, and Sanja Grguric-Sipka. "N-alkylphenothiazines - synthesis, structure and application as ligands in metal complexes." Chemical Industry 70, no. 4 (2016): 461–71. http://dx.doi.org/10.2298/hemind150331052k.

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Phenothiazines are a large group of heterocyclic, aromatic molecules with nitrogen and sulphur between two benzene rings. Their derivatives, N-alkylphenothiazines have supstitutient on heterocyclic nitrogen atom which gives them different properties. Also, a series of these molecules have substitution on carbon atom at place 2 of phenothiazine benzene ring. Alkylphenothiazines contain aminoalkyl substituent and their alkyl, acyl and sulphonil derivatives, as well as monocyclic and bicyclic heterocycles attached at thiazine nitrogen atom or directly linked to benzene ring. The N-alkylphenothiaz

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27

Anet, Frank A. L., and Max Kopelevich. "Anomeric and conformational deuterium isotope effects in saturated sulphur and nitrogen heterocycles." Journal of the Chemical Society, Chemical Communications, no. 8 (1987): 595. http://dx.doi.org/10.1039/c39870000595.

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28

Krátky, Martin, and Jarmila Vinsova. "Sulphur-Containing Heterocycles as Antimycobacterial Agents: Recent Advances in Thiophene and Thiadiazole Derivatives." Current Topics in Medicinal Chemistry 16, no. 26 (2016): 2921–52. http://dx.doi.org/10.2174/1568026616666160506131118.

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29

Tschierske, C., H. Köhler, H. Zaschke, and E. Kleinpeter. "The anomeric effect of the carhoethoxy group in oxygen and sulphur containing heterocycles." Tetrahedron 45, no. 22 (1989): 6987–98. http://dx.doi.org/10.1016/s0040-4020(01)89165-1.

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30

Hegazi, Abdelrahman H., Eiman M. Fathalla, and Jan T. Andersson. "Environmentally weathered residues source diagnostic by high-molecular-weight polycyclic aromatic sulphur heterocycles." International Journal of Environmental Analytical Chemistry 96, no. 15 (2016): 1469–79. http://dx.doi.org/10.1080/03067319.2016.1271418.

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31

Yue, Guizhou, Sicheng Li, Dan Jiang, et al. "Syntheses of 3,3-Disubstituted Dihydrobenzofurans, Indolines, Indolinones and Isochromanes by Palladium-Catalyzed Tandem Reaction Using Pd(PPh3)2Cl2/(±)-BINAP as a Catalytic System." Catalysts 10, no. 9 (2020): 1084. http://dx.doi.org/10.3390/catal10091084.

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A general procedure for the tandem arylation reaction of arylbromide with heteroaryl compounds was developed by using Pd(PPh3)2Cl2/(±)-BINAP (1,1′-Binaphthalene-2,2′-diylbis (diphenylphosphane)) as catalytic system. Both sulphur- and oxygen-containing heterocycles were also employed as an efficient reagent for arylation, which gave moderate to excellent yields with moderate to good regioselectivities (5:1 to > 20:1 ir (isomer ratio)). Except for dihydrobenzofurans, indolines and indolinones, this type of tandem reaction was also expanded to synthesize isochromanes. The synthesized new compo

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32

Nishioka, Masaharu, Robert M. Campbell, Milton L. Lee, and Raymond N. Castle. "Isolation of sulphur heterocycles from petroleum- and coal-derived materials by ligand exchange chromatography." Fuel 65, no. 2 (1986): 270–73. http://dx.doi.org/10.1016/0016-2361(86)90019-0.

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33

Parveen, Humaira, Raedah Aiyed Suliman Alatawi, Nadia Hussein El Sayed, Sadaf Hasan, Sayeed Mukhtar, and Asad U. Khan. "Synthesis, characterization and biological evaluation of some novel nitrogen and sulphur containing organometallic heterocycles." Arabian Journal of Chemistry 10, no. 8 (2017): 1098–106. http://dx.doi.org/10.1016/j.arabjc.2015.05.002.

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34

Niluvanji Matada, Mallikarjuna, Keshavayya Jathi, Maliyappa M. Rangappa, et al. "A new sulphur containing heterocycles having azo linkage: Synthesis, structural characterization and biological evaluation." Journal of King Saud University - Science 32, no. 8 (2020): 3313–20. http://dx.doi.org/10.1016/j.jksus.2020.09.016.

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35

Heda, Lalchand, Chandresh Pareek, Dushyant Pareek, and Sonraj Mosalpuri. "Synthesis and biological screening of octasubstituted-triphenodioxazines and its sulphur analogues with some novel intermediates." Open Chemistry 8, no. 1 (2010): 51–57. http://dx.doi.org/10.2478/s11532-009-0100-5.

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AbstractAttempts have been made to prepare for the first time the octasubstituted-triphenodioxazines and triphenodithiazines heterocycles by cyclisation of 3,6-dichloro-2,5-bis(2′,4′,5′-trichloroanilino)-1,4-benzoquinone and condensation. This wasfollowed by cyclisation of substituted 2-aminobenzenethiol respectively with chloranil and bromanil in ethanolic solution of fused sodium acetate in the presence of benzoyl chloride in nitrobenzene. Their structures were confirmed on the basis of their chemical and spectral analyses. Moreover, the biological activity of these compounds was evaluated a

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36

J., S. Waghmare, T. Tayade D., E. Shelke M., and U. Patil S. "Studies in the antimicrobial activities of 1-substituted-3-formamidinothiocarbamides and 1,3-bis-(substitutedthioamido)guanidines." Journal of Indian Chemical Society Vol. 83, Aug 2006 (2006): 819–21. https://doi.org/10.5281/zenodo.5827794.

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Department of Chemistry, Jijamata Mahavidyalaya, Buldana-431 001, Maharashtra, India Department of Chemistry. Mahatma Fule Mahavidyalaya, Warud-444 906, Maharashtra. India <em>E-mail </em>: skdtayade@yahoo.com Department of Chemistry, S.S.I.K.R. Innani Mahavidyalaya, Karanja (Lad), Maharashtra, India <em>Manuscript received 21 September 2005, revised 13 January 2006, accepted 5 May 2006</em> The present research work has been undertaken in the synthesis of nitrogen, nitrogen and sulphur containing heteroacycles and heterocycles and to investigate their applications in medicinal,agricultural, i

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37

Majumdar, Krishna, and Nilasish Pal. "A Facile Regioselective Synthesis of Tetracyclic Sulphur Heterocycles by Tandem Thio-Claisen Rearrangement (SUPPORTING DATA)." Letters in Organic Chemistry 4, no. 2 (2007): 120–22. http://dx.doi.org/10.2174/157017807780414091.

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38

METH-COHN, Otto, and Brian TARNOWSKI. "A Useful Synthon for Sulphur Heterocycles; II. The Synthesis of Fused Thiopyrones, Benzisothiazoles and Benzothiophenes." Synthesis 1978, no. 01 (2002): 58–60. http://dx.doi.org/10.1055/s-1978-24676.

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39

Youssef, Ahmed S. A., Kamal A. Kandeel, Wael S. I. Abou-Elmagd, and Ahmed I. Hashem. "Conversion of 5-Aryl-3-phenylthio-2(3H)-furanones into Some Nitrogen- and Sulphur-Containing Heterocycles." Phosphorus, Sulfur, and Silicon and the Related Elements 182, no. 1 (2007): 85–97. http://dx.doi.org/10.1080/10426500600867349.

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40

Yamashita, Yoshiro, Takanori Suzuki, Gunzi Saito, and Toshio Mukai. "Novel quinone-type acceptors fused with sulphur heterocycles and their highly conductive complexes with electron donors." Journal of the Chemical Society, Chemical Communications, no. 19 (1986): 1489. http://dx.doi.org/10.1039/c39860001489.

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41

De, Asish, Subhra Bhattacharya, Sagar S. Jash, Soumitra Mukherjee, Uttam Saha, and Parimal K. Sen. "Studies in sulphur heterocycles. Part 7 . Tricyclic compounds related to 5,6,7,8-tetrahydro-4H-cyclohepta[b]thiophene." Journal of Heterocyclic Chemistry 29, no. 5 (2009): 1213–17. http://dx.doi.org/10.1002/jhet.5570290528.

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42

Carvalho, M. Fernanda N. N., Rudolf Herrmann, and Gabriele Wagner. "Synthesis of alkynyl-substituted camphor derivatives and their use in the preparation of paclitaxel-related compounds." Beilstein Journal of Organic Chemistry 13 (June 26, 2017): 1230–38. http://dx.doi.org/10.3762/bjoc.13.122.

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Compounds containing two alkyne groups in close vicinity at the rigid skeleton of camphorsulfonamide show unique reactivities when treated with electrophiles or catalytic amounts of platinum(II). The formed product structures depend not only on the reagents used but also on the substituents attached to the triple bonds. Cycloisomerisations with perfect atom economy lead to polycyclic heterocycles that resemble to some extent the AB ring system of paclitaxel. Herein, we present practical synthetic methods for the selective synthesis of precursor dialkynes bearing different substituents (alkyl,

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43

Harris, Robin K., Simon Lane, Kenneth Metcalfe, Kenneth J. Packer, Andrew Root, and Richard J. K. Taylor. "Solid- and solution-state carbon-13 nuclear magnetic resonance studies of a series of sulphur-containing heterocycles." Journal of the Chemical Society, Perkin Transactions 2, no. 12 (1986): 1887. http://dx.doi.org/10.1039/p29860001887.

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44

Gupta, R. R., M. Kumar, and Rakesh Kumar. "Studies on Diamagnetic Susceptibility of Biologically Active Heterocycles, Part 2 Diamagnetic Susceptibilities of 4H-1,4-Benzothiazines and their Sulfones." Zeitschrift für Naturforschung B 41, no. 1 (1986): 110–12. http://dx.doi.org/10.1515/znb-1986-0123.

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Diamagnetic susceptibilities for a number of 4H-1,4-benzothiazines and their sulfones are reported. A theoretical method to estimate diamagnetic susceptibilities of 4H-1,4-benzothiazines is also reported. Benzothiazine has been considered to be composed of two units, one consisting of a benzene ring containing amino and thio groups at ortho positions with other substituents and other consisting of β-diketones/β-ketoesters. Diamagnetic contributions of these two units have been calculated from diamagnetic susceptibilities of substituted o-aminobenzenethiols and β-diketones/β-ketoesters and have

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45

Micucci, Matteo, Maurizio Viale, Alberto Chiarini, et al. "3-Aryl-4-nitrobenzothiochromans S,S-dioxide: From Calcium-Channel Modulators Properties to Multidrug-Resistance Reverting Activity." Molecules 25, no. 5 (2020): 1056. http://dx.doi.org/10.3390/molecules25051056.

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Our research groups have been involved for many years in studies aimed at identifying new active organic compounds endowed with pharmacological properties. In this work, we focused our attention on the evaluation of cardiovascular and molecular drug resistance (MDR) reverting activities of some nitrosubstituted sulphur-containing heterocycles. Firstly, we have examined the effects of 4-nitro-3-(4-methylphenyl)-3,6-dihydro-2H-thiopyran S,S-dioxide 5, and have observed no activity. Then we have extended our investigation to the 3-aryl-4-nitrobenzothiochromans S,S-dioxide 6 and 7, and have observ

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46

Peter, Rudolf, Vlastimil Matějec, and Miroslav Zdražil. "The effect of Co in hydrodesulphurization of 2,3-dihydrobenzo[b]thiophene on Co-Mo catalyst." Collection of Czechoslovak Chemical Communications 51, no. 6 (1986): 1195–205. http://dx.doi.org/10.1135/cccc19861195.

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Hydrodesulphurization of benzo[b]thiophene and 2,3-dihydrobenzo[b]thiophene on Mo/alumina and Co-Mo/alumina catalysts has been studied in a flow reactor at atmospheric pressure and temperature 543 K. The amount of dihydrobenzo[b]thiophene formed in hydrodesulphurization of benzo[b]thiophene and the amount of benzo[b]thiophene formed in hydrodesulphurization of dihydrobenzo[b]thiophene were much lower on Co-Mo catalyst then on Mo catalyst. The equilibrium constant of the hydrogenation of benzo[b]thiophene to dihydrobenzo[b]thiophene at 543 K was determined. This partial equilibrium was attained

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47

Eyley, Stephen C., Harry Heaney, George Papageorgiou та Robert F. Wilkins. "Mannich reactions of π-excessive heterocycles using bis-(dialkylamino)methanes and alkoxydialkylaminomethanes activated with acetyl chloride or sulphur dioxide". Tetrahedron Letters 29, № 24 (1988): 2997–3000. http://dx.doi.org/10.1016/0040-4039(88)85070-6.

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Bhattacharya, Somenath, Soumallya Chakraborty, Rohan Pal, et al. "A Comprehensive Review on Pyrazole and It’s Pharmacological Properties." International Journal for Research in Applied Science and Engineering Technology 10, no. 9 (2022): 1769–74. http://dx.doi.org/10.22214/ijraset.2022.46924.

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Abstract: Heterocyclic chemistry is very important aspects in organic chemistry. Heterocyclic system consists of one or more heteroatoms like nitrogen, oxygen, sulphur, etc with hydrogen atoms. The system can be classified as saturated as well as non saturated system or hydrocarbons. Another classification of this ring system is divided in some categories like three-membered, four-membered, five-membered, six-memebered, seven-membered, fused heterocyclics etc. Some compounds under this cklassification are acidic or basic in nature. Examples of heterocyclic compounds are Pyrole, Furan, Thiophen

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Moody, Christopher J., and Roger J. Taylor. "Rhodium carbenoid mediated cyclisations. Part 5. Synthesis and rearrangement of cyclic sulphonium ylides preparation of 6- and 7-membered sulphur heterocycles." Tetrahedron 46, no. 18 (1990): 6501–24. http://dx.doi.org/10.1016/s0040-4020(01)96017-x.

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Nádudvari, Ádám, Anna Abramowicz, Justyna Ciesielczuk, Jerzy Cabała, Magdalena Misz-Kennan, and Monika Fabiańska. "Self-Heating Coal Waste Fire Monitoring and Related Environmental Problems: Case Studies from Poland and Ukraine." Journal of Environmental Geography 14, no. 3-4 (2021): 26–38. http://dx.doi.org/10.2478/jengeo-2021-0009.

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Abstract The self-heating of coal waste dumps is considered as a serious environmental issue, wherever active or inactive coal mining has been present. This issue is introduced from two active coal mining regions from Poland (Upper Silesian Coal Basin) and Ukraine (Donetsk Coal Basin) based on mineralogy, organic petrography and geochemistry, and remote sensing techniques. Thermally affected coal wastes reveal changes recorded by organic and mineral matter. Irregular cracks and fissures appear within and at the edges of organic matter particles, which are oxidised, devolatilised and plasticise

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