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Journal articles on the topic 'Heterocyclic compounds. Mass spectrometry'

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Published: 4 June 2021

Last updated: 2 February 2022

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1

Chmovzh, Timofey, Ekaterina Knyazeva, Olga Ustimenko, and Oleg Rakitin. "3,6-Dibromopyridazine-4,5-diamine." Molbank 2019, no. 1 (2019): M1053. http://dx.doi.org/10.3390/m1053.

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Dihalogenated derivatives of 1,2,5-chalcogenadiazoles fused with benzene or heterocyclic rings are of interest as starting compounds for photovoltaic materials. The 1,2,5-chalcogenadiazole ring in these heterocycles was most commonly prepared from the corresponding ortho-diamine moiety. In this communication, 3,6-dibromopyridazine-4,5-diamine was prepared via the reaction of 4,7-dibromo[1,2,5]thiadiazolo[3,4-d]pyridazine with sodium methoxide in THF by heating at reflux for four hours. The structure of the newly synthesized compound was established by means of high resolution mass-spectrometry

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2

Chmovzh, Timofey N., and Oleg A. Rakitin. "7-Bromo-[1,2,5]selenadiazolo[3,4-d]pyridazin-4(5H)-one." Molbank 2021, no. 2 (2021): M1229. http://dx.doi.org/10.3390/m1229.

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New heterocyclic systems containing 1,2,5-chalcogenadiazoles are of great interest for the creation of organic photovoltaic materials and biologically active compounds. In this communication, 3,6-dibromopyridazine-4,5-diamine was investigated in reaction with selenium dioxide in order to obtain 4,7-dibromo-[1,2,5]selenadiazolo[3,4-d]pyridazine. We found that 7-bromo-[1,2,5]selenadiazolo[3,4-d]pyridazin-4(5H)-one, the first representative of the new heterocyclic system, was isolated as a hydrolysis product of the corresponding 4,7-dibromoderivative. The structure of the newly synthesized compou

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3

Khakwani, Samia, Samina Aslam, Mehrzadi Noureen Shahi, Alice M. Rolim Bernardino, and Misbahul Ain Khan. "Mass Spectrometry of Heterocyclic Compounds: Benzo[b]pyrazolo[3,4-b]-1,6-naphthyridines." Asian Journal of Chemistry 28, no. 11 (2016): 2385–87. http://dx.doi.org/10.14233/ajchem.2016.19946.

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4

Xie, Y. J., Z. F. He, E. Zhang, and H. J. Li. "Technical note: Characterization of key volatile odorants in rabbit meat using gas chromatography mass spectrometry with simultaneous distillation extraction." World Rabbit Science 24, no. 4 (2016): 313. http://dx.doi.org/10.4995/wrs.2016.4464.

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<p>This study explored the key volatile compounds in both male and female rabbit meat. Simultaneous distillation extraction with dichloromethane was adopted to extract the volatile compounds in Hyla rabbit meat. A total of 35 volatile compounds were identified by gas chromatography–mass spectrometry and quantified with 2, 4, 6-thimethylpyridine as internal standard. Seventeen volatile aldehydes, 4 alcohols, 2 ketones, 2 acids, 1 heterocyclic compound, 2 alkanes and 7 esters were detected. Hexanal, heptanal, octanal, nonanal, (E, E)-2, 4-decadienal, 1-octen-3-ol and (Z)-2-decenal were the

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5

Mazzotta, Michael G., Jason O. E. Young, Jesse W. Evans, et al. "Direct analysis in real time mass spectrometry of fused ring heterocyclic organometallic compounds." Analytical Methods 7, no. 9 (2015): 4003–7. http://dx.doi.org/10.1039/c5ay00295h.

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6

Karai, Oumaima, Sara Hajib, Serigne Abdou Khadir Fall та ін. "Comparative Study of Synthesis, Structural and Antioxidant Activity In Vitro of Some New Carboxylic α,α-diaminodiesters Derivatives". European Journal of Advanced Chemistry Research 2, № 3 (2021): 6–13. http://dx.doi.org/10.24018/ejchem.2021.2.3.64.

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Considering the richness of heterocyclic chemistry, and the diversity of applications it possesses, in the present work we were interested in preparing new polyfunctional α,α-diaminodiesters derived from glycine, via the N-alkylation reaction of methyl 2-azido-2-benzamidoacetate with a series of heterocyclic and non-heterocyclic carboxylic aminoesters, using different bases. The structures of the synthesized molecules were characterized by 1D and 2D NMR spectroscopy, mass spectrometry (MS-ESI) and elemental analysis. Two compounds from this series were isolated as single crystals and their che

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7

Zhou, Jinjie, Tao Feng, and Ran Ye. "Differentiation of Eight Commercial Mushrooms by Electronic Nose and Gas Chromatography-Mass Spectrometry." Journal of Sensors 2015 (2015): 1–14. http://dx.doi.org/10.1155/2015/374013.

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Volatile profiles of eight mushrooms were characterized by gas chromatography-mass spectrometry and electronic nose analysis. Volatile compounds including 11 alcohols, 11 ketones, 15 aldehydes, 3 sulfur compounds and alkenes, 8 terpenes, 7 acid and esters, 5 heterocyclic compounds, 20 aromatic compounds, and 4 other compounds were identified. The overall aroma properties of the mushrooms were analyzed by the electronic nose. Results indicated that the e-nose sensors have the ability to accurately respond to different mushrooms with similar fingerprint chromatograms. The relationship between th

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8

李, 柚. "The Application of High Performance Liquid Chromatography-Mass Spectrometry Analysis of Heterocyclic Compounds." Hans Journal of Chemical Engineering and Technology 03, no. 04 (2013): 142–47. http://dx.doi.org/10.12677/hjcet.2013.34026.

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9

Adeeva, Valeriya G., Marina S. Bobyleva, Nickolay S. Kulikov, Valentina G. Kharchenko, and Lev M. Yudovich. "Gas chromatography—mass spectrometry of the stereoisomers of heterocyclic compounds. Part 1. Perhydrothioxanthenes." J. Chem. Soc., Perkin Trans. 2, no. 6 (1992): 965–69. http://dx.doi.org/10.1039/p29920000965.

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10

Huck, Christian W., Verena Huck-Pezzei, Rania Bakry, et al. "Capillary Electrophoresis Coupled To Mass Spectrometry for Forensic Analysis." Open Chemical Engineering Journal 1, no. 1 (2007): 30–43. http://dx.doi.org/10.2174/1874123100701010030.

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In this review the most important techniques, which are developed to hyphenate capillary electrophoresis to mass spectrometry (CE-MS), suitable for forensic analysis, are summarized. Analytes of interest are divided into four main parts, namely, compounds with amine containing side chains, compounds with N-containing saturated ring structures, other heterocycles and peptides. Sample pre-treatments and direct injection modes used in CE-MS for forensic analysis are briefly discussed from critical point of view. Special emphasis is placed to point out the advantages of mass spectrometric detectio

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11

Hangzhou, Guo, Kinghunt Tsao, Li Yu-Gui, and Wangjian. "Mass spectrometric studies of heterocyclic organophosphorus compounds: 1,3,2-benzodioxaphospholes." Organic Mass Spectrometry 21, no. 5 (1986): 283–87. http://dx.doi.org/10.1002/oms.1210210509.

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12

Rani, Deepika, Gursharan Singh, and Seema Sharma. "Reactions of MoOCl4 and MoO2Cl2 with Heterocyclic Thioamides." Oriental Journal Of Chemistry 37, no. 2 (2021): 459–66. http://dx.doi.org/10.13005/ojc/370228.

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MoOCl4/MoO2Cl2 were reacted with 2-mercaptopyridine (IUPAC: pyridine-2-thiol)/4-phenylimidazole-2-thiol (IUPAC: 4-phenyl-1, 3-dihydroimidazole-2-thione)/6-mercaptopurine (IUPAC: 1, 7-dihydro-purine-6-thione) in acetonitrile medium using equal/twice molar concentrations at normal temperature. The reactions yielded products: MoOCl3(C5H4NS-SNH4C5).2HCl, [1]; Mo3O3Cl12(C5H4NS-SNH4C5)(CH3CN)2, [2]; Mo2OCl6(C9H7N2S)4, [3] and Mo2O2Cl8(C5H4N4S)(CH3CN), [4]. The various techniques used for characterization of compounds are: Fourier transform infrared, proton nuclear magnetic resonance, 13C nuclear mag

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13

Bobyleva, Marina S., and Nickolay S. Kulikov. "Gas chromatography–mass spectrometry of the stereoisomers of heterocyclic compounds. Part 2a.1 Perhydroxanthenes." Journal of the Chemical Society, Perkin Transactions 2, no. 4 (1998): 951–54. http://dx.doi.org/10.1039/a706142k.

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14

Kulikov, Nickolay S., and Marina S. Bobyleva. "Gas chromatography–mass spectrometry of the stereoisomers of heterocyclic compounds. Part 2b.1 Perhydroxanthenes." Journal of the Chemical Society, Perkin Transactions 2, no. 4 (1998): 955–58. http://dx.doi.org/10.1039/a706143i.

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15

Xia, Liang, Yan Zhang, Jingbo Zhang, et al. "Identification of Novel Thiazolo[5,4-b]Pyridine Derivatives as Potent Phosphoinositide 3-Kinase Inhibitors." Molecules 25, no. 20 (2020): 4630. http://dx.doi.org/10.3390/molecules25204630.

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A series of novel 2-pyridyl, 4-morpholinyl substituted thiazolo[5,4-b]pyridine analogues have been designed and synthesized in this paper. These thiazolo[5,4-b]pyridines were efficiently prepared in seven steps from commercially available substances in moderate to good yields. All of these N-heterocyclic compounds were characterized by nuclear magnetic resonance (NMR) and high-resolution mass spectrometry (HRMS) analysis and tested for phosphoinositide 3-kinase (PI3K) enzymatic assay. The results indicated that these N-heterocyclic compounds showed potent PI3K inhibitory activity, and the IC50

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16

Tao, Kaixiang, Taijia Ye, Mingming Cao, et al. "Salumycin, a New Pyrazolequinone from a Streptomyces albus J1074 Mutant Strain." Molecules 25, no. 18 (2020): 4098. http://dx.doi.org/10.3390/molecules25184098.

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Heterocyclic natural products with various bioactivities play significant roles in pharmaceuticals. Here, we isolated a heterocyclic compound salumycin (1) from a Streptomyces albus J1074 mutant strain. The structure of (1) was elucidated via single-crystal X-ray diffraction, mass spectrometry (MS), fourier transform infrared spectrometer (FTIR), and nuclear magnetic resonance (NMR) data analysis. Salumycin (1) contained a novel pyrazolequinone ring, which had never been previously reported in a natural product. Salumycin (1) exhibited moderate 2,2′-diphenyl-1-picrylhydrazyl (DPPH)-radical sca

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17

BOBYLEVA, M. S., and N. S. KULIKOV. "ChemInform Abstract: Gas Chromatography-Mass Spectrometry of the Stereoisomers of Heterocyclic Compounds. Part 2a. Perhydroxanthenes." ChemInform 29, no. 31 (2010): no. http://dx.doi.org/10.1002/chin.199831024.

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18

KULIKOV, N. S., and M. S. BOBYLEVA. "ChemInform Abstract: Gas Chromatography-Mass Spectrometry of the Stereoisomers of Heterocyclic Compounds. Part 2b. Perhydroxanthenes." ChemInform 29, no. 31 (2010): no. http://dx.doi.org/10.1002/chin.199831025.

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19

Bobyleva, M. S., and N. S. Kulikov. "Mass spectrometry and structure of ions of heterocyclic compounds activated by collision: Naphthiridines and benzazines." Theoretical and Experimental Chemistry 25, no. 5 (1990): 577–80. http://dx.doi.org/10.1007/bf00529981.

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20

Chernetsova, E. S., M. V. Ovcharov, Yu Yu Khomyakov, P. O. Bochkov, and A. V. Varlamov. "The use of DART mass spectrometry for express confirmation of empirical formulas of heterocyclic compounds." Russian Chemical Bulletin 59, no. 10 (2010): 2014–15. http://dx.doi.org/10.1007/s11172-010-0349-z.

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21

Bobyleva, M. S., N. S. Kulikov, and S. I. Bobrovskii. "Mass spectrometry and structures of ions of heterocyclic compounds activated by collision. 2. 2-Methylnitroindolizines." Chemistry of Heterocyclic Compounds 24, no. 12 (1988): 1347–51. http://dx.doi.org/10.1007/bf00486677.

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22

Montoya-Aguilera, Julia, Jeremy R. Horne, Mallory L. Hinks, et al. "Secondary organic aerosol from atmospheric photooxidation of indole." Atmospheric Chemistry and Physics 17, no. 18 (2017): 11605–21. http://dx.doi.org/10.5194/acp-17-11605-2017.

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Abstract. Indole is a heterocyclic compound emitted by various plant species under stressed conditions or during flowering events. The formation, optical properties, and chemical composition of secondary organic aerosol (SOA) formed by low-NOx photooxidation of indole were investigated. The SOA yield (1. 3 ± 0. 3) was estimated from measuring the particle mass concentration with a scanning mobility particle sizer (SMPS) and correcting it for wall loss effects. The high value of the SOA mass yield suggests that most oxidized indole products eventually end up in the particle phase. The SOA parti

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23

Bratakos, Sotirios, Panagiotis Zoumpoulakis, Eleni Siapi, Kyriakos Riganakos, and Vassilia Sinanoglou. "Determination of 2,5-Diketopiperazines Iin Greek Processed Olives by Liquid Chromatography/Mass Spectrometry Analysis." Current Research in Nutrition and Food Science Journal 4, Special-Issue-October (2016): 63–76. http://dx.doi.org/10.12944/crnfsj.4.special-issue-october.09.

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Diketopiperazines (DKPs) are cyclic dipeptides which have been detected in a variety of natural products, especially in thermally treated or fermented foods and beverages, providing a metallic bitter taste. DKPs, mainly due to their characteristic heterocyclic system, have been reported to exhibit a broad spectrum of biological activities including antimicrobial, antiviral, antitumor, antihyperglycaemic and antimutagenic. In the present study, several DKPs were identified in seven different Greek varieties of processed olives using HR-LC-MSn. The identification of DKPs in olive samples was ach

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24

Trovato, Emanuela, Adriana Arigò, Federica Vento, Giuseppe Micalizzi, Paola Dugo, and Luigi Mondello. "Influence of Citrus Flavor Addition in Brewing Process: Characterization of the Volatile and Non-Volatile Profile to Prevent Frauds and Adulterations." Separations 8, no. 2 (2021): 18. http://dx.doi.org/10.3390/separations8020018.

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In the last few years, the flavored beer market has increased significantly. In particular, consumers showed a growing interest in citrus-flavored beers. Citrus fruits contain, among other class of compounds, terpenes and terpenoids and oxygenated heterocyclic compounds. The absence of a specific legislation concerning beer flavored production and ingredients reported on the labels makes these beers subject to possible adulterations. Solid phase micro extraction (SPME) followed by gas chromatographic–mass spectrometry (GC-MS) and gas chromatographic-flame ionization detector (GC-FID) analysis

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25

Shaltaeva, Y. R., A. A. Sysoev, S. S. Poteshin, et al. "The investigation of ionization conditions in the trace amounts detection of heterocyclic compounds by ion mobility spectrometry and mass spectrometry." IOP Conference Series: Materials Science and Engineering 151 (October 2016): 012018. http://dx.doi.org/10.1088/1757-899x/151/1/012018.

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26

Kafka, Z., M. Kuraš, J. Novák, and L. Vodička. "Determination of the composition of hydrogenation products from nitrogenous heterocyclic compounds by gas chromatography-mass spectrometry." Fresenius' Zeitschrift für Analytische Chemie 321, no. 5 (1985): 475–78. http://dx.doi.org/10.1007/bf00487084.

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27

El-Sharkawy, Karam A., Mohammed Al Bratty, Hassan A. Alhazmi, and Asim Najmi. "Design, synthesis, and biological activities of novel thiophene, pyrimidine, pyrazole, pyridine, coumarin and isoxazole: Dydrogesterone derivatives as antitumor agents." Open Chemistry 19, no. 1 (2021): 322–37. http://dx.doi.org/10.1515/chem-2021-0028.

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Abstract On the basis of our consideration to design and to develop antitumor activities of heterocyclic compound derivatives, especially in fused ring system, we refer to the possibility of the heterocyclic extension of one of the most important steroid compounds used as a medicinal drug. The reaction of dydrogesterone with each of the malononitrile or ethylcyanoacetate containing elemental sulfur afforded thiophene derivatives 1a,b. Also, dydrogesterone was reacted with a mixture of ethylcyanoacetate–hydrazine, ethylcyanoacetae–urea, or ethylcyanoacetate–thiourea to produce pyrazole derivati

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28

Al-Mutabagani, Laila A., Fathy M. Abdelrazek, Sobhi M. Gomha, et al. "Synthesis and Biological Evaluation of Thiazolyl-Ethylidene Hydrazino-Thiazole Derivatives: A Novel Heterocyclic System." Applied Sciences 11, no. 19 (2021): 8908. http://dx.doi.org/10.3390/app11198908.

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The reaction of 2-(1-(2-(2-(4-methoxybenzylidene)hydrazinyl)-4-methylthiazol-5-yl)ethylidene)hydrazinecarbothioamide with a range of hydrazonoyl chlorides and α-halo-compounds yielded three new series of thiazole derivatives. Chemical and physical techniques were used to analyze all newly prepared derivatives (1H-NMR, 13C-NMR, FT-IR and mass spectrometry). The potential antimicrobial and anticancer properties of the synthesized derivatives were investigated using various in vitro biological experiments. Most of the thiazole compounds tested were effective against Gram-positive and Gram-negativ

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29

Davison, Annette D., Duncan A. Veal, Peter Karuso, and Daniel R. Jardine. "Halopicolinic acids, novel products arising through the degradation of chloro- and bromo-biphenyl bySphingomonas paucimobilisBPSI-3." Canadian Journal of Microbiology 42, no. 1 (1996): 66–71. http://dx.doi.org/10.1139/m96-009.

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Sphingomonas paucimobilis BPSI-3 was previously isolated from a mixed microbial consortium growing on biphenyl as the sole source of carbon and energy. Transformation of 4 -chlorobiphenyl (4CBP) was demonstrated by this strain, although little or no growth was observed. In minimal salts medium supplemented with 4CBP or bromobiphenyl and dextrose, yellow coloured product(s) were rapidly formed. Gas chromatography – mass spectrometry (GC–MS) revealed single ring N-heterocyclic compounds that were identified as halopicolinic acids. We believe this to be the first report of such compounds being fo

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30

Lu, Tong, Ling Dong, Hongmei Pan, et al. "Design and synthesis of C-ring quinoxaline-substituted sinomenine 1,2,3-triazole derivatives via click reactions." Journal of Chemical Research 44, no. 11-12 (2020): 699–704. http://dx.doi.org/10.1177/1747519820919853.

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The synthesis of C-ring quinoxaline-substituted sinomenine 1,2,3-triazole derivatives at the 4-OH via click reactions is accomplished, and a total of 16 novel sinomenine double N-heterocyclic derivatives are obtained in 74%–95% yields. The C-ring is first transformed into a 1,2-diketone structure under the action of hydrochloric acid, and then reacted with o-phenylenediamine to obtain a C-ring quinoxaline-substituted structure. The 4-OH of sinomenine reacts with chloropropyne to give an alkynyl sinomenine, and then reacts with sodium azide and various benzyl chlorides to give the target compou

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31

Combourieu, Bruno, Pascale Besse, Martine Sancelme, et al. "Common Degradative Pathways of Morpholine, Thiomorpholine, and Piperidine by Mycobacterium aurum MO1: Evidence from1H-Nuclear Magnetic Resonance and Ionspray Mass Spectrometry Performed Directly on the Incubation Medium." Applied and Environmental Microbiology 66, no. 8 (2000): 3187–93. http://dx.doi.org/10.1128/aem.66.8.3187-3193.2000.

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ABSTRACT In order to see if the biodegradative pathways for morpholine and thiomorpholine during degradation by Mycobacterium aurumMO1 could be generalized to other heterocyclic compounds, the degradation of piperidine by this strain was investigated by performing1H-nuclear magnetic resonance directly with the incubation medium. Ionspray mass spectrometry, performed without purification of the samples, was also used to confirm the structure of some metabolites during morpholine and thiomorpholine degradation. The results obtained with these two techniques suggested a general pathway for degrad

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32

Kulikov, Nickolay S., and Marina S. Bobyleva. "Gas chromatography–mass spectrometry of the stereoisomers of heterocyclic compounds. Part 3.† Perhydro-4-thia-s-indacene." Journal of the Chemical Society, Perkin Transactions 2, no. 3 (2000): 571–76. http://dx.doi.org/10.1039/a904941j.

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33

Zhang, Jixiang, Cheng Qian, and Baohui Jiang. "Bio-Crude Production via Hydrothermal Liquefaction of Enteromorpha prolifera: Operating Condition Optimization and High-Resolution FT-ICR Mass Spectral Analysis." Transactions of the ASABE 60, no. 6 (2017): 1799–806. http://dx.doi.org/10.13031/trans.12422.

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Abstract. is one of the main species causing green tide. In this study, hydrothermal liquefaction of E. was carried out, and the operating conditions were optimized using response surface methodology. The results indicated that hydrothermal liquefaction at 295°C with 14% solids content produced the highest bio-oil yield of 18.4%. The higher heating value was 31.9 to 34.2 MJ kg-1 and almost monotonically increased with increasing reaction temperature. The energy recovery, carbon recovery, and nitrogen recovery of bio-crude were mainly dependent on yield rather than elemental composition as the

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34

Stoica, Cristina Ioana, Ioana Ionuț, Adrian Pîrnău, et al. "Synthesis, lipophilicity and antimicrobial activity evaluation of some new thiazolyl-oxadiazolines." Medicine and Pharmacy Reports 88, no. 4 (2015): 521–29. http://dx.doi.org/10.15386/cjmed-473.

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Background and aims. Synthesis of new potential antimicrobial agents and evaluation of their lipophilicity.Methods. Ten new thiazolyl-oxadiazoline derivatives were synthesized and their structures were validated by 1H-NMR and mass spectrometry. The lipophilicity of the compounds was evaluated using the principal component analysis (PCA) method. The necessary data for applying this method were obtained by reverse-phase thin-layer chromatography (RP-TLC). The antimicrobial activities were tested in vitro against four bacterial strains and one fungal strain.Results. The lipophilicity varied with

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35

El-Borai, Mohamed A., and Hala F. Rizk. "Vicinal Benzo[b]thiophene-5,6-dicarboxaldehyde in Heterocyclic Synthesis: A Reagent for Fluorescence Determination of Amino Acids." Journal of Chemical Research 2009, no. 5 (2009): 326–28. http://dx.doi.org/10.3184/030823409x450516.

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Benzo[ b]thiophene-5,6-dicarboxaldehyde reacts with dibenzyl ketone, thiodiacetic acid dimethyl ester, hydrazine, p-toluidine, p-aminoacetophenone and nitromethane to give the corresponding seven, six and five-membered rings condensed to benzo[ b]thiophene. Reaction of benzo[ b]thiophene-5,6-dicarboxaldehyde with p-toluidine in the presence of 2-mercaptoethanol gives highly fluorescent compounds. Also, benzo[ b]thiophene-5,6-dicarboxaldehyde was applied to fluorogenic reaction with some amino acids and the obtained data were compared with the reported data in the case of o-phthaldehyde. The sy

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36

Kriechbaum, Margit, Daniela Otte, Manuela List, and Uwe Monkowius. "Synthesis and Characterization of Silver(I) and Gold(I) Complexes Bearing a Pyrido-annelated N-Heterocyclic Carbene: A Rare Example of a Cocrystal Containing Two Different Gold(I) Complexes." Zeitschrift für Naturforschung B 69, no. 11-12 (2014): 1188–98. http://dx.doi.org/10.5560/znb.2014-4175.

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Abstract The cyclohexyl-substituted imidazo[1,5-a]pyridin-2-ium hexafluorophosphate, 2a, has been prepared as precursor for the respective pyrido-annelated N-heterocyclic carbene. [(NHC)2Ag]PF6, 3, has been synthesized by the reaction of 2a with AgCl=KOH in dichloromethane (DCM). Unexpectedly, the reaction of 3 with (tht)AuBr yielded both (NHC)AuBr and [(NHC)Au(tht)]PF6 which formed a 1 : 1 cocrystal (4a,b). The complexes are aggregated to infinite chains, which are governed by both π-π stacking and weak aurophilic interactions. Subsequent oxidation of the co-crystalline material with CsBr3 ga

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37

Aloisi, Ivan, Mariosimone Zoccali, Peter Q. Tranchida, and Luigi Mondello. "Analysis of Organic Sulphur Compounds in Coal Tar by Using Comprehensive Two-Dimensional Gas Chromatography-High Resolution Time-of-Flight Mass Spectrometry." Separations 7, no. 2 (2020): 26. http://dx.doi.org/10.3390/separations7020026.

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Coal tar is a complex mixture of organic compounds obtained from the thermal treatment of coal; it contains several different chemical classes of compounds, such as polycyclic aromatic hydrocarbons, phenols and different heterocyclic compounds including sulphur derivatives. In the present research, a target analysis was carried out for the characterisation of fourteen different classes of organic sulphur compounds in coal tar by using cryogenically-modulated (CM) comprehensive two-dimensional gas chromatography-high resolution time-of-flight mass spectrometry (GC×GC-HR ToFMS) with the support

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38

Ivanova, Svetlana S., Yulia Moryganova, Mahmoud Hamdoush, Oscar I. Koifman, Denis S. Sal'nikov, and Pavel A. Stuzhin. "Phosphorus(V) tetrapyrazinocorrolazines — first corrolazine derivatives with fused heterocyclic rings." Journal of Porphyrins and Phthalocyanines 18, no. 10n11 (2014): 875–83. http://dx.doi.org/10.1142/s1088424614500679.

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Tetrapyrazinocorrolazines — first corrolazine derivatives with annulated heterocycles — have been prepared as phosphorus(V) complexes by the reaction of metal free tetrapyrazinoporphyrazines [( R 8 TPyzPA ) H 2] (R = Ph, Me) with phosphorus(III) chloride or bromide in pyridine. Oxophosphorus(V) complexes [( R 8 TPyzCA ) P = O ] were obtained when the reaction mixture was poured into water, while dilution with methanol leads to dimethoxyphosphorus(V) complexes [( R 8 TPyzCA ) P ( OMe )2]. The obtained compounds were characterized by MALDI-TOF mass-spectrometry and by IR, 1 H , 31 P NMR measurem

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39

Yunnikova, Lidia P., Victoria V. Esenbaeva, and Tatiana А. Akentieva. "The application of 1,3-dioxolane in synthesis of disubstituted 3,4-dihydroquinazolines, diarylmethane or methylenediamine." Butlerov Communications 58, no. 4 (2019): 48–52. http://dx.doi.org/10.37952/roi-jbc-01/19-58-4-48.

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The interaction between 1,3-dioxolane with primary aromatic amine- sulfanilamide (streptocide), secondary aromatic amine-N-benzylaniline and also with amine of heterocyclic series – 4-aminopyridine. It is found that, sulfanilamide (streptocide), which has an electron withdrawing sulfonamide group in para position, reacts with 1,3-dioxolane in an atmosphere of benzol and trifluoroacetic acid producing 3-(4-sulfamoylphenyl)-3,4-dihydroquinazoline-6-sulphonamide, that is corresponding to the previous result obtained when 1,3-dioxolane reacts with para-nitroaniline (which also contains electron-wi

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Kumar, Raju Suresh, Dhaifallah M. Al-thamili, Abdulrahman I. Almansour, Natarajan Arumugam, and Faruq Mohammad. "A One-Pot Three-Component Synthesis and Investigation of the In Vitro Mechanistic Anticancer Activity of Highly Functionalized Spirooxindole-Pyrrolidine Heterocyclic Hybrids." Molecules 25, no. 23 (2020): 5581. http://dx.doi.org/10.3390/molecules25235581.

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With an aim to develop more effective and affordable anticancer agents possessing a unique mechanism of action, we designed and synthesized derivatives of spirooxindole-pyrrolidine heterocyclic hybrids in good yields through a one-pot three-component (3+2) cycloaddition strategy. The synthesized compounds were characterized thoroughly for the physicochemical properties by making use of FT-IR, NMR spectroscopy, and mass spectrometry. Further, these compounds have been evaluated for the influence of anticancer activity against HepG2 cells up to 200 µg/mL concentration. The highly active molecula

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Li, Jian, Taiju Di, and Jinhe Bai. "Distribution of Volatile Compounds in Different Fruit Structures in Four Tomato Cultivars." Molecules 24, no. 14 (2019): 2594. http://dx.doi.org/10.3390/molecules24142594.

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Distribution of volatile compounds in different fruit structures were analyzed in four tomato cultivars by headspace-solid-phase microextraction (SPME)-gas chromatography-mass spectrometry (GC-MS). A total of 36 volatile compounds were identified in fruit samples, which were primarily aldehydes, hydrocarbons, alcohols, ketones, furans, esters, nitrogen compounds, and sulfur and nitrogen-containing heterocyclic compounds. The volatile compositions in pericarp (PE), septa and columella (SC), locular gel and seeds (LS), and stem end (SE) tissues showed different profiles. The PE tissue showed the

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Arulmurugan, Subramaniyan, and Helen P. Kavitha. "Synthesis and potential cytotoxic activity of some new benzoxazoles, imidazoles, benzimidazoles and tetrazoles." Acta Pharmaceutica 63, no. 2 (2013): 253–64. http://dx.doi.org/10.2478/acph-2013-0018.

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2 The present work deals with the synthesis of some novel heterocyclic compounds such as benzoxazoles , 7, 13 and 19, imidazoles 3, 8, 14 and 20, benzimidazoles 4, 9, 15 and 21, and tetrazoles 10, 16, and 22. The synthesized compounds were characterized by IR, 1H NMR, mass spectrometry and elemental analysis. The compounds were evaluated for cytotoxicity against human cancer cell lines such as MCF-7 (breast cancer) and HT-29 (colon cancer) by the MTT assay method. Among the tested compounds, 4,4’-sulfonylbis(N-(2-(1H-benzo[d]imidazol- -2-yl)ethyl)aniline (9), N-bis(2-(benzo[d]oxazol-2-yl)-ethy

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Ge, Yanjing, Kai Li, Caifeng Xie, et al. "Formation of Volatile and Aroma Compounds during the Dehydration of Membrane-Clarified Sugarcane Juice to Non-Centrifugal Sugar." Foods 10, no. 7 (2021): 1561. http://dx.doi.org/10.3390/foods10071561.

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The development of volatile compounds and their precursors during the dehydration process of membrane-clarified sugarcane juice to non-centrifugal sugar (NCS) was investigated. Head-space solid phase microextraction/gas chromatography–mass spectrometry (HS-SPME/GC–MS) coupled with chemometrics was employed to assess the differences at the various stages of the dehydration process. A total of 111 volatile compounds were identified, among which 57 were endogenous compounds from sugarcane juice and displayed an attenuated abundance in the first 30 min. Typical oxygen and nitrogen heterocyclic com

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Li, Wu-Wu, Min-Yan Zheng, Ying Guo, et al. "Construction of C-glycosides of heterocycles containing the pyrimidin-2-amine or the 1H-pyrazolo[3,4-b]pyridine moiety and their biological evaluation for anticancer activities." Journal of Chemical Research 43, no. 3-4 (2019): 152–57. http://dx.doi.org/10.1177/1747519819856942.

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A series of novel C-glycosides of heterocyclic derivatives containing a pyrimidin-2-amine or a 1 H-pyrazolo[3,4- b]pyridine moiety were synthesized using condensation reactions of the substituted puerarin with guanidine or 3-amino-5-hydroxypyrazole in methyl alcohol. Their chemical structures were characterized by Fourier-transform infrared spectroscopy, nuclear magnetic resonance, and high-resolution mass spectrometry. In addition, their biological activity has been demonstrated by in vitro evaluation against the human leukemia cells K562 and human prostate cancer cells PC-3 by MTT-based assa

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Konstantinova, Lidia S., Mikhail A. Tolmachev, Vadim V. Popov, and Oleg A. Rakitin. "Ethyl 11a,12-Dihydrobenzo[b]benzo[5,6][1,4]oxazino[2,3-e][1,4]oxazine-5a(6H)-carboxylate." Molbank 2020, no. 3 (2020): M1149. http://dx.doi.org/10.3390/m1149.

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The 11a,12-dihydrobenzo[b]benzo[5,6][1,4]oxazino[2,3-e][1,4]oxazine heterocyclic system has been used in the construction of heteropropellanes, which attracted much attention not only on the possible modification of drugs, but also for novel materials with unusual and important physical properties. In this communication, the reaction of ethyl 2-(hydroxyimino)propanoate 1 with disulfur dichloride and o-aminophenol, which gave ethyl 11a,12-dihydrobenzo[b]benzo[5,6][1,4]oxazino[2,3-e][1,4]oxazine-5a(6H)-carboxylate in moderate yield, was described. The structure of the newly synthesized compound

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Tang, Jie, Dan Chen, Gen Zhang, Hongwei Yang, and Guangbin Cheng. "A “Green” Primary Explosive: Design, Synthesis, and Testing." Synlett 30, no. 08 (2019): 885–92. http://dx.doi.org/10.1055/s-0037-1611696.

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This account presents the synthesis and the characterization of triazine-tetrazine nitrogen heterocyclic compounds. Some compounds were characterized by NMR and IR spectroscopy, mass spectrometry, differential scanning calorimetry (DSC), and single-crystal X-ray diffraction. The physical and chemical properties were obtained by EXPLO5 v6.01, gas pycnometer, BAM Fallhammer, BAM Friction tester, and several detonation tests. The results show that the new metal-free polyazido compound 3,6-bis-[2-(4,6-diazido-1,3,5-triazin-2-yl)-diazenyl]-1,2,4,5-tetrazine (4) with high heat of formation (2820 kJ

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Golubenkova, Alexandra S., Nikita E. Golantsov, and Leonid G. Voskressensky. "Methyl (2E)-3-[3-Benzyl-2-(3-methoxy-3-oxoprop-1-yn-1-yl)-2-(1-naphthyl)imidazolidin-1-yl]acrylate." Molbank 2021, no. 1 (2020): M1176. http://dx.doi.org/10.3390/m1176.

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Compounds with propargylamine moiety are useful synthetic precursors of several important classes of nitrogen-containing heterocycles. The title compound, methyl (2E)-3-[3-benzyl-2-(3-methoxy-3-oxoprop-1-yn-1-yl)-2-(1-naphthyl)imidazolidine-1-yl]acrylate, has been prepared by domino-reaction, employing easily available 1-benzyl-2-(1-naphthyl)-4,5-dihydro-1H-imidazole and methyl propiolate in a high 92% yield. The structure of title compound was determined using 1H-NMR, 13C-NMR, UV, FT-IR and HRMS (High-Resolution Mass Spectrometry).

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Dugo, P., L. Mondello, E. Sebastiani, R. Ottanà, G. Errante, and G. Dugo. "IDENTIFICATION OF MINOR OXYGEN HETEROCYCLIC COMPOUNDS OF CITRUS ESSENTIAL OILS BY LIQUID CHROMATOGRAPHY-ATMOSPHERIC PRESSURE CHEMICAL IONISATION MASS SPECTROMETRY." Journal of Liquid Chromatography & Related Technologies 22, no. 19 (1999): 2991–3005. http://dx.doi.org/10.1081/jlc-100102073.

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Li, Zhijian, Sergey A. Nizkorodov, Hong Chen, Xiaohui Lu, Xin Yang, and Jianmin Chen. "Nitrogen-containing secondary organic aerosol formation by acrolein reaction with ammonia/ammonium." Atmospheric Chemistry and Physics 19, no. 2 (2019): 1343–56. http://dx.doi.org/10.5194/acp-19-1343-2019.

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Abstract. Ammonia-driven carbonyl-to-imine conversion is an important formation pathway to the nitrogen-containing organic compounds (NOCs) in secondary organic aerosols (SOAs). Previous studies have mainly focused on the dicarbonyl compounds as the precursors of light-absorbing NOCs. In this work, we investigated whether acrolein could also act as an NOC precursor. Acrolein is the simplest α, β-unsaturated mono-carbonyl compound, and it is ubiquitous in the atmosphere. Experiments probing multiphase reactions of acrolein as well as bulk aqueous-phase experiments were carried out to study the

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Popov, Mark S., Nikolay V. Ul’yanovskii, and Dmitry S. Kosyakov. "Gas Chromatography–Mass Spectrometry Quantification of 1,1-Dimethylhydrazine Transformation Products in Aqueous Solutions: Accelerated Water Sample Preparation." Molecules 26, no. 19 (2021): 5743. http://dx.doi.org/10.3390/molecules26195743.

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The use of highly toxic rocket fuel based on 1,1-dimethylhydrazine (UDMH) in many types of carrier rockets poses a threat to environment and human health associated with an ingress of UDMH into wastewater and natural reservoirs and its transformation with the formation of numerous toxic nitrogen-containing products. Their GC-MS quantification in aqueous samples requires matrix change and is challenging due to high polarity of analytes. To overcome this problem, accelerated water sample preparation (AWASP) based on the complete removal of water with anhydrous sodium sulfate and transferring ana

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