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Journal articles on the topic 'Dibenzo'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Zhu, Xiu Hua, Cheng Zhi Zhou, Ran Ran, Zhen Wang, Xin Dong Ma, and Xiao Xiao Li. "Levels and Distributions of Six Toxic PAHs in the Urban Air of Dalian, China During Heating Periods." Advanced Materials Research 518-523 (May 2012): 2572–75. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.2572.

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Superscript text Superscript textThe concentration of six potential carcinogenic compounds (3-Methylcholanthrene, Dibenz(a,h)acridine, Dibenz(a,i)acridine, Dibenzo(a,e)pyrene, Dibenzo(a,h)pyrene, Dibenzo(a,i)pyrene ) in the urban air of Dalian, China were monitored from November 2009 to March 2010 with active high-volume sampler. They were detected in gaseous phase and particulate phase, respectively. The total concentration of them was 563.2 pg m-3, and they were mainly found in particulate phase with the concentration of 540.5 pg m-3 while the concentration in the gas phase only was 22.7 pg

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2

Tucker, Sheryl A., William E. Acree, and Christopher Upton. "Polycyclic Aromatic Nitrogen Heterocycles. Part V: Fluorescence Emission Behavior of Select Tetraaza- and Diazaarenes in Nonelectrolyte Solvents." Applied Spectroscopy 47, no. 2 (1993): 201–6. http://dx.doi.org/10.1366/0003702934048235.

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Fluorescence emission spectra are reported for tricycloquinazoline, dibenzo[c,f][2,7]naphthyridine, dibenzo[a,c]phenazine, dibenz[b,h]-indeno[1,2,3de][1,6]naphthyridine, and dibenz[c,f]indeno[l,2,3ij]-[2,7]naphthyridine dissolved in organic nonelectrolyte solvents of varying polarity and acidity. Results of these experiments were used to screen PANHs for potential probe character. The effect of nitromethane as a selective quenching agent on both the unprotonated and protonated PANHs was also examined. Nitromethane was found to quench fluorescence emission of dibenzo[c,f][2,7]naphthyridine. Emi

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3

Amszi, Vicki L., Yvonne Cordero, Bradley Smith, et al. "Spectroscopic Investigation of Fluorescence Quenching Agents: Effect of Nitromethane on the Fluorescence Emission Behavior of Select Cyclopenta-PAH, Aceanthrylene, and Fluorene Derivatives." Applied Spectroscopy 46, no. 7 (1992): 1156–61. http://dx.doi.org/10.1366/0003702924124213.

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Nitromethane is examined as a selective fluorescence quenching agent for “alternant” alkyl-substituted polycyclic aromatic hydrocarbons (PAHs). Fluorescence emission behavior is reported for 11 H-benz[bc]aceanthrylene, 4 H-cyclopenta[def]phenanthrene, 4 H-cyclopenta[def]chrysene, 13 H-dibenzo[a,g]fluorene, 13 H-dibenzo[a,i]fluorene, 4 H-benzo[b]cyclopenta[mno]chrysene, 4 H-cyclopenta[pqr]picene, 7 H-dibenzo[c,g]fluorene, 9 H-benz(6,7)indeno[1,21]phenanthrene, 4 H-benzo[b]cyclopenta[jkl]triphenylene, 13 H-dibenz[bc,k]aceanthrylene, 13 H-dibenz[bc,l]aceanthrylene, and 4 H-benzo[def]cyclopenta[mn

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4

Payili, Nagaraju, Santhosh Reddy Rekula, Anjaiah Aitha, V. V. S. R. N. Anji Karun Mutha, Challa Gangu Naidu, and Satyanarayana Yennam. "Synthesis of dibenzo[a,d]cycloheptanoids via aryne insertion into 2-arylidene-1,3-indandiones." Organic & Biomolecular Chemistry 17, no. 43 (2019): 9442–46. http://dx.doi.org/10.1039/c9ob01900f.

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5

Krawczyk, Hanna. "Dibenzo[b,f]oxepine Molecules Used in Biological Systems and Medicine." International Journal of Molecular Sciences 24, no. 15 (2023): 12066. http://dx.doi.org/10.3390/ijms241512066.

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In this short review, including 113 references, issues related to dibenzo[b,f]oxepine derivatives are presented. Dibenzo[b,f]oxepine scaffold is an important framework in medicinal chemistry, and its derivatives occur in several medicinally relevant plants. At the same time, the structure, production, and therapeutic effects of dibenzo[b,f]oxepines have not been extensively discussed thus far and are presented in this review. This manuscript addresses the following issues: extracting dibenzo[b,f]oxepines from plants and its significance in medicine, the biosynthesis of dibenzo[b,f]oxepines, th

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6

Dastan, Arif, Nurullah Saracoglu, and Haydar Kilic. "The Dibenzosuberenone Scaffold as a Privileged Substructure: From Synthesis to Application." Synthesis 50, no. 03 (2017): 391–439. http://dx.doi.org/10.1055/s-0036-1589518.

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Numerous studies on dibenzosuberenones, especially on 5-dibenzosuberenones, have emerged in recent years. This review focuses on the chemistry of dibenzosuberenones, including their synthesis and applications, which are currently used as tools by the synthetic and biological communities.1 Introduction2 5-Dibenzosuberenone (5H-Dibenzo[a,d]cyclohepten-5-one)2.1 Synthesis of 5-Dibenzosuberenone2.2 Reactions of 5-Dibenzosuberenone3 5H-Dibenzo[a,c]cyclohepten-5-one3.1 Synthesis of 5H-Dibenzo[a,c]cyclohepten-5-one3.2 Reactions of 5H-Dibenzo[a,c]cyclohepten-5-one4 6H-Dibenzo[a,c]cyclohepten-6-one and

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7

Maier, David Irving Hermann, Barend Christiaan Buurman Bezuidenhoudt, and Charlene Marais. "Strategies in the synthesis of dibenzo[b,f]heteropines." Beilstein Journal of Organic Chemistry 19 (May 22, 2023): 700–718. http://dx.doi.org/10.3762/bjoc.19.51.

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The dibenzo[b,f]azepine skeleton is important in the pharmaceutical industry, not only in terms of existing commercial antidepressants, anxiolytics and anticonvulsants, but also in reengineering for other applications. More recently, the potential of the dibenzo[b,f]azepine moiety in organic light emitting diodes and dye-sensitized solar cell dyes has been recognised, while catalysts and molecular organic frameworks with dibenzo[b,f]azepine derived ligands have also been reported. This review provides a brief overview of the different synthetic strategies to dibenzo[b,f]azepines and other dibe

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8

Bremner, JB, та W. Jaturonrusmee. "Manganese(III) Acetate-Induced Formation of a Fused, Chloro-Substituted β-Lactam Derivative From a Chloroacetamide". Australian Journal of Chemistry 43, № 8 (1990): 1461. http://dx.doi.org/10.1071/ch9901461.

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Reaction of 1-chloroacetyl-5-methoxy-2,3-dihydro-1H-dibenzo[de,h]quinoline (1) with manganese(III) acetate in acetic acid at 50° gave the novel fused spiro derivative 11-chloro-4-methoxy-1,2-dihydro-6H-azeto[2,1-f]dibenzo[de,h]quinoline-6,12(11H)-dione (6) in 21% yield, together with 5-methoxy-7H-dibenzo[de,h]quinolin-7-one (3), 5-methoxy-2,3-dihydro-7H-dibenzo[de,h]quinolin-7-one (4), and 1- chloroacetyl-5-methoxy-2,3-dihydro-1H-dibenzo[de,h]-quinolin-7-yl ethanoate (5) in 1, 3 and 44% yields respectively. Compound (5) was shown to be a precursor of (3), (4) and (6).

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9

Gao, Xingbao, Bingjing Ji, Dahai Yan, Qifei Huang, and Xuemei Zhu. "A full-scale study on thermal degradation of polychlorinated dibenzo-p-dioxins and dibenzofurans in municipal solid waste incinerator fly ash and its secondary air pollution control in China." Waste Management & Research: The Journal for a Sustainable Circular Economy 35, no. 4 (2016): 437–43. http://dx.doi.org/10.1177/0734242x16677078.

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Degradation of polychlorinated dibenzo- p-dioxins and dibenzofurans in municipal solid waste incinerator fly ash is beneficial to its risk control. Fly ash was treated in a full-scale thermal degradation system (capacity 1 t d−1) to remove polychlorinated dibenzo- p-dioxins and dibenzofurans. Apart from the confirmation of the polychlorinated dibenzo- p-dioxin and dibenzofuran decomposition efficiency, we focused on two major issues that are the major obstacles for commercialising this decomposition technology in China, desorption and regeneration of dioxins and control of secondary air pollut

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10

Matsubara, Hiroshi, Mitsunobu Osatani, Koji Yano, Tomohiro Adachi, and Koji Yamamoto. "Synthesis and Characterisation of [2.2](5,13)Dibenzo[c;1]chrysenophane." Journal of Chemical Research 23, no. 1 (1999): 12–13. http://dx.doi.org/10.1177/174751989902300112.

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High-dilution coupling of 5,13-bis(bromomethyl)dibenzo[ c;1]chrysene (7) and 5,13-bis(sulfanylmethyl)dibenzo[ c;1]-chrysene 8 afforded the dithia derivative 9 which was converted, via the disulfone 10, into an unusually strained compound, [2.2](5,13)dibenzo[ c;1]chrysenophane 5.

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11

Lahmy, S., J. M. Salmon, and P. Viallet. "Microspectrofluorometric comparison of benzo(a)pyrene and dibenzo(c,h)acridine metabolism in single living 3T3 fibroblasts." Journal of Histochemistry & Cytochemistry 35, no. 2 (1987): 197–201. http://dx.doi.org/10.1177/35.2.3794313.

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The purpose of this study was to determine if dibenzo(c,h)acridine could be used as a probe for the N-heterocyclic aromatic compound detoxification system. The determination was achieved by cell population studies (histograms) using microspectrofluorimetry on single living cells. The results show a similar metabolic distribution pattern between dibenzo(c,h)acridine and benzo(a)pyrene, whereas important differences appear between 6-aminochrysene and dibenzo(c,h)acridine, respectively amine aromatic and N-heterocyclic aromatic compounds. No differences were observed in the metabolism of benzo(a)

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12

Hadisaputra, Saprizal, Saprini Hamdiani, Muhammad Arsyik Kurniawan, and Nuryono Nuryono. "Influence of Macrocyclic Ring Size on the Corrosion Inhibition Efficiency of Dibenzo Crown Ether: A Density Functional Study." Indonesian Journal of Chemistry 17, no. 3 (2017): 431. http://dx.doi.org/10.22146/ijc.26667.

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The effect of macrocycle ring size on the corrosion inhibition efficiency of dibenzo-12-crown-4 (DB12C4), dibenzo-15-crown-5 (DB15C5), dibenzo-18-crown-6 (DB18C6), dibenzo-21-crown-7 (DB21C7) and dibenzo-24-crown-8 (DB24C8) have been elucidated by mean of density functional calculation at B3LYP/6-31G(d) level of theory in the gas and aqueous environment. The quantum chemical parameters including the frontier orbital energies (EHOMO, ELUMO), ionization potential (I), electron affinity (A), the absolute electronegativity (χ), hardness (η), softness (σ), and the fraction of electron transferred (

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13

Suzuki, Takanori, Yuto Sakano, Tomohiro Iwai, et al. "Electrochromic and unique chiroptical properties of helically deformed tetraarylquinodimethanes generated from less-hindered dicationic precursors upon reduction." Pure and Applied Chemistry 86, no. 4 (2014): 507–16. http://dx.doi.org/10.1515/pac-2013-1003.

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AbstractElectron-donating 1,1,4,4-tetraarylbutadiene is a representative electrochromic dye, and the same chromophore can be found in 9,10-bis(diarylmethylene)-9,10-dihydrophenanthrene (dibenzo-oQD) albeit in a fixed s-cis geometry. Unlike thermodynamically unstable 7,7,8,8-tetraaryl-o-quinodimethane, spontaneous electrocyclization is prohibited by dibenzo-annulation. Several derivatives of dibenzo-oQD were successfully generated despite highly strained geometry caused by steric hindrance between the bulky diarylmethylene units. Their precursors are phenanthrene-9,10-diyl bis(diarylmethylium)

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14

Hao, Miao Li, Ying Ming Li, Ying Zhang, Xiao Rong Lan, Yu Lei Guan, and Bo Lun Yang. "Quantum Chemical Calculations on Binding Energy of Alkyl Substituted Crown Ethers with Sr²⁺." Applied Mechanics and Materials 448-453 (October 2013): 139–44. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.139.

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Structures of Dibenzo-18-crown-6(DB18C6), Di-methyl-dibenzo-18-crown-6(DMB18C6), Di-tert-butyl-dibenzo-18-crown-6(DTBB18C6), Di-tert-amyl-dibenzo-18-crown-6(DTAB1C6) and their complexes with strontium ion were optimized based upon DFT at B3LYP using 3-21G basis. The binding energy of crown ethers with Sr2+ was calculated according to the energy of optimal structures. The complex strength increased gradually from DB18C6 to DTAB18C6, which could be related to the changes of cavity size of crown ethers and electron density on the crown rings. Addition and extension of alkyl groups on DB18C6 could

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15

Zhang, Zunting, Yang Kang, Rong Hou, Xiaoyan Min, Tao Wang, and Yong Liang. "An Oxidant- and Catalyst-Free Synthesis of Dibenzo[a,c]carbazoles via UV Light Irradiation of 2,3-Diphenyl-1H-indoles." Synthesis 54, no. 06 (2021): 1621–32. http://dx.doi.org/10.1055/a-1677-4881.

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AbstractAn efficient methodology for the synthesis of dibenzo[a,c]carbazoles via annulation of 2,3-diphenyl-1H-indoles in EtOH under UV light irradiation (λ = 365 nm) along with hydrogen evolution is described. This method exhibits the advantages of mild reaction conditions, no requirement of any oxidants and catalysts, and release of hydrogen as the only byproduct. Notably, the mechanism investigation confirms that the trans-4b,8a-dihydro-9H-dibenzo[a,c]carbazole intermediate could convert into cis-4b,8a-dihydro-9H-dibenzo[a,c]carbazole, which relies on the nitrogen atom of the indole ring. T

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16

Dickert, Franz L., and Michael W. Vonend. "Konkurrierende Koordination von Kronenethern, Perchloratanionen und Lösungsmittelmolekülen am Co(II)-Ion — Eine Leitfähigkeits-und NMR-Studie in Nitromethan / Competitive Coordination of Crown Ethers, Perchlorate Anions and Solvent Molecules at Co(II)-Ions — A Conductivity and NMR Study on Nitromethane." Zeitschrift für Naturforschung B 42, no. 1 (1987): 42–46. http://dx.doi.org/10.1515/znb-1987-0109.

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Abstract The 1:1 complexes between Co(II) and the crown ethers dibenzo[24]crown-8, dibenzo[18]-crown-6 and [18]crown-6 show a molar conductivity in nitromethane which indicates coordination of even perchlorate anions. The substitution of this anion by solvent molecules can be monitored by conductometric titrations. This procedure reveals that dibenzo[24]crown-8 and [18]crown-6 is a potent five dentate ligand whereas dibenzo[18]crown-6 strongly coordinates only via three donor atoms. The mixed complexes with crown ether and methanol show strong outer-sphere associa-tion with the Perchlorate ani

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17

Tucker, Sheryl A., Hardjanti Darmodjo, William E. Acree, John C. Fetzer, and Maximilian Zander. "Spectroscopic Investigation of Fluorescence Quenching Agents. Part II: Effect of Nitromethane on the Fluorescence Emission Behavior of Thirty-Six Alternant Benzenoid Polycyclic Aromatic Hydrocarbons." Applied Spectroscopy 46, no. 8 (1992): 1260–65. http://dx.doi.org/10.1366/0003702924123872.

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Nitromethane is examined as a selective quenching agent for discriminating between “alternant” versus “nonalternant” polycyclic aromatic hydrocarbons in unknown mixtures. Of the 36 benzenoid solutes studied, only dibenzo[hi,wx]heptaphene failed to obey the selective quenching rule. Also reported are new experimental fluorescence probe studies for dibenzo[de,st]pentacene, dibenzo[fg,qr]pentacene, naphtho[8,1,2hij)-hexaphene, benzo[vwx]hexaphene, benzo[1,2,3cd;4,5,6c'd‘]diperylene, dibenzo[hi,wx]heptacene, benzo[b]triphenylene, chrysense, and anthracene dissolved in nonelectrolyte solvents of va

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18

Chow, Chi Hao Eugene, Hoa Phan, Xiaojie Zhang, and Jishan Wu. "Sulfur-Doped (Dibenzo)heptazethrene and (Dibenzo)octazethrene Diradicaloids." Journal of Organic Chemistry 85, no. 1 (2019): 234–40. http://dx.doi.org/10.1021/acs.joc.9b02796.

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19

Zander, M. "The Intra-annular Internal Heavy-atom Effect on the Fluorescence and Phosphorescence Properties of Oxygen, Sulphur or Selenium Containing Heterocyclic Systems Related to Dibenzo [b,n] perylene." Zeitschrift für Naturforschung A 44, no. 11 (1989): 1116–18. http://dx.doi.org/10.1515/zna-1989-1113.

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Fluorescence and phosphorescence properties of dibenzo [2,3:10,11] perylo [1,12-bcd] furan (1), dibenzo [2,3:10,11] perylo [1,12-bcd] thiophene (2), and dibenzo [2,3:10,11 ] perylo [1,12-bcd] selenophene (3) have been studied. Fluorescence quantum yields as well as phosphorescence lifetimes correlate linearly with where ck are the Hückel AO coefficients in the HOMO of the parent carbocyclic system dibenzo [b, n] perylene (4) on carbon centres k to which the hetero-atom is bound, and ζ is the spin-orbit coupling constant of the heavy-atom present. The half-value concentration of fluorescence qu

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20

Chiba, Arisa, Ryoko Tanaka, Mayuno Hotta, et al. "Stereochemistry of N-Acyl-5H-dibenzo[b,d]azepin-7(6H)-ones." Molecules 28, no. 12 (2023): 4734. http://dx.doi.org/10.3390/molecules28124734.

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The stereochemical properties of N-acyl-5H-dibenzo[b,d]azepin-7(6H)-ones (2a–c), which inhibit potassium channels in T cells, were examined by freezing their conformational change due to 4-methyl substitution. N-Acyl-5H-dibenzo[b,d]azepin-7(6H)-ones exist as pairs of enantiomers [(a1R, a2R), (a1S, a2S)], and each atropisomer is separable at room temperature. An alternate procedure for preparing 5H-dibenzo[b,d]azepin-7(6H)-ones involves the intramolecular Friedel–Crafts cyclization of N-benzyloxycarbonylated biaryl amino acids. Consequently, the N-benzyloxy group was removed during the cyclizat

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21

Jang, Seokhoon, Kyung Hyung Lee, Jun Yeob Lee, and Youngu Lee. "Dibenzo[b,d]furan and dibenzo[b,d]thiophene molecular dimers as hole blocking materials for high-efficiency and long-lived blue phosphorescent organic light-emitting diodes." Journal of Materials Chemistry C 7, no. 31 (2019): 9599–608. http://dx.doi.org/10.1039/c9tc02689d.

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22

Elix, JA, DA Venables, and L. Brako. "New Chlorine-Containing Depsidones From the Lichen Phyllopsora corallina var. ochroxantha." Australian Journal of Chemistry 43, no. 11 (1990): 1953. http://dx.doi.org/10.1071/ch9901953.

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The depsidones phyllopsorin (2-chloro-4,6-diformyl-3-hydroxy-8-methoxy- 1,9-dimethyl-11H-dibenzo[ b,e ][1,4]dioxepin-11-one (3), chlorophyllopsorin (2,7-dichloro-4,6-diformyl-3-hydroxy-8-methoxy-1,9- dimethyl-11H-dibenzo[ b,e ][1,4]dioxepin-11-one) (4), methyl 2,7- dichloro-psoromate (methyl 2,7-dichloro-4-formyl-3-hydroxy-8-methoxy- 1,9-dimethyl-11-oxo-11H-dibenzo[ b,e ][1,4]dioxepin-6-carboxylate) (5) and methyl 2,7-dichloronorpsoromate (methyl 2,7-dichloro-4-formyl-3,8- dihydroxy-1,9-dimethyl-11-oxo-11H-dibenzo[ b,e ][1,4]dioxepin-6-carb- oxylate ) (6) have been isolated from the lichen Phy

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23

Tobiasz, Piotr, Filip Borys, Marta Kucharska, Marcin Poterała, and Hanna Krawczyk. "Synthesis and Study of Building Blocks with Dibenzo[b,f]oxepine: Potential Microtubule Inhibitors." International Journal of Molecular Sciences 25, no. 11 (2024): 6155. http://dx.doi.org/10.3390/ijms25116155.

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The synthesis of biphenylmethoxydibenzo[b,f]oxepine or photoswitchable fluorinated dibenzo[b,f]oxepine derivatives with one or three azo bonds, potential microtubule inhibitors, is described. Our studies provide a concise method for constructing derivatives containing the dibenzo[b,f]oxepine skeleton. An analysis of products was run using experimental and theoretical methods. Next, we evaluated the E/Z isomerization of azo-dibenzo[b,f]oxepine derivatives, which could be photochemically controlled using visible-wavelength light.

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Wang, Zhongping, Xiaoqing Liu, Yan Lu, et al. "Direct on-surface synthesis of gold–phthalocyanine via cyclization of cyano-groups with gold adatoms." Materials Chemistry Frontiers 3, no. 7 (2019): 1406–10. http://dx.doi.org/10.1039/c9qm00070d.

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Au–(dibenzo[fg,op]tetracene) porphyrazine has been synthesized on an Au(111) surface by using the precursor of dibenzo[fg,op]tetracene-5,6,12,13-tetracarbonitrile via cyclization of cyanogroups with Au adatoms.

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Elix, JA, GA Jenkins, and DA Venables. "New Chlorine-Containing Depsidones From Lichens." Australian Journal of Chemistry 43, no. 1 (1990): 197. http://dx.doi.org/10.1071/ch9900197.

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The depsidones, 3-O-demethylscensidin (2,7-dichloro-3-hydroxy-8-methoxy-1,6-dimethyl-11H-dibenzo[ b,e ][1,4]dioxepin-11-one)(5), O- methyldiploicin (2,4,7,9-tetrachloro-3,8-dimethoxy-1,6-dimethyl-11 H- dibenzo [ b,e ][1,4]dioxepin-11-one (6) and O- methylvicanicin (2,7-dichloro-3,8-dimethoxy-1,4,6,9-tetramethyl-11H-dibenzo[ b,e ][1,4]dioxepin-11-one) (13) have been detected in lichens for the first time and the structures of these metabolites have been established by comparison with synthetic material.

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Jang, Seokhoon, Kyung Hyung Lee, Jun Yeob Lee, and Youngu Lee. "Novel hole blocking materials based on 2,6-disubstituted dibenzo[b,d]furan and dibenzo[b,d]thiophene segments for high-performance blue phosphorescent organic light-emitting diodes." Journal of Materials Chemistry C 7, no. 4 (2019): 826–34. http://dx.doi.org/10.1039/c8tc04900a.

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Novel hole blocking materials based on 2,6-disubstituted dibenzo[b,d]furan and dibenzo[b,d]thiophene segments have been successfully synthesized and characterized for high-performance blue phosphorescent organic light-emitting diodes.

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Vyas, Vijyesh K., and Bhalchandra M. Bhanage. "Asymmetric transfer hydrogenation of seven membered tricyclic ketones: N-substituted dibenzo[b,e]azepine-6,11-dione driven by nonclassical CH/O interactions." Organic Chemistry Frontiers 3, no. 5 (2016): 614–19. http://dx.doi.org/10.1039/c6qo00036c.

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Enantioselective transfer hydrogenation of dibenzo-fused-azepine-diones: N-substituted dibenzo[b,e]azepin-6-11-dione was achieved by ruthenium catalysis in the presence of formic acid/triethylamine as a mild hydrogen source.

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Lan, Liuyuan, Zhiming Chen, Yunchuan Li, Lei Ying, Fei Huang, and Yong Cao. "Donor–acceptor conjugated polymers based on cyclic imide substituted quinoxaline or dibenzo[a,c]phenazine for polymer solar cells." Polymer Chemistry 6, no. 43 (2015): 7558–69. http://dx.doi.org/10.1039/c5py01235j.

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A series of donor–acceptor type of conjugated polymers based on cyclic imide substituted quinoxaline or dibenzo[a,c]phenazine were synthesized, where the copolymers comprising dibenzo[a,c]phenazine showed much higher photovoltaic performances.

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Elix, JA, UA Jenie, and GA Jenkins. "Three New Depsidones From the Lichen Neofuscelia subincerta." Australian Journal of Chemistry 40, no. 12 (1987): 2031. http://dx.doi.org/10.1071/ch9872031.

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The depsidones , glomelliferonic acid (4)(8-hydroxy-3-methoxy-ll-oxo-l-(2-oxopentyl)-6- pentyl -11H-dibenzo[ b,e ] [1,4]dioxepin-7-carboxylic acid), loxodellonic acid (5) (8-hydroxy-3-methoxy-11-oxo-1-(2-oxopenty1)-6-propyl-llH-dibenzo[ b,e ][l,4]dioxepin-7-carboxylic acid) and glomellonic acid (6) (8-hydroxy-3-methoxy-1l-oxo-l,6-di(2-oxopentyl)-11H- dibenzo [ b,e ][l,4]dioxepin-7-carboxylic acid), have been isolated from the lichen Neofuscelia subincerta ( Essl .) Essl . and characterized.

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30

Wu, Tun, Guo Yuan, Die Liu, et al. "Terpyridinyl dibenzo[b,d]furan and dibenzo[b,d]thiophene based tetrameric bismetallo-macrocycles." RSC Advances 6, no. 7 (2016): 5631–35. http://dx.doi.org/10.1039/c5ra21307j.

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Dibenzo[b,d]thiophene and dibenzo[b,d]furan based bisterpyridines were prepared. Direct self-assembly with Fe<sup>2+</sup> led to metallo-macrocyclic mixtures. Utilizing the robust metallo-organic-ligands afforded the pure tetrameric macrocycles.

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31

Tobiasz, Piotr, Filip Borys, Marta Borecka, and Hanna Krawczyk. "Synthesis and Investigations of Building Blocks with Dibenzo[b,f] Oxepine for Use in Photopharmacology." International Journal of Molecular Sciences 22, no. 20 (2021): 11033. http://dx.doi.org/10.3390/ijms222011033.

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The synthesis of photoswitchable azo-dibenzo[b,f]oxepine derivatives and microtubule inhibitors were described. Subsequently, we examined the reaction of methoxy derivative 3-nitrodibenzo[b,f]oxepine with different aldehydes and in the presence of BF3·OEt2 as a catalyst. Our study provided a very concise method for the construction of the azo-dibenzo[b,f]oxepine skeleton. The analysis of products was run using experimental and theoretical methods. Next, we evaluated the E/Z isomerization of azo-dibenzo[b,f]oxepine derivatives, which could be photochemically controlled using visible-wavelength

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32

Tobiasz, Piotr, Filip Borys, Marta Borecka, and Hanna Krawczyk. "Synthesis and Investigations of Building Blocks with Dibenzo[b,f] Oxepine for Use in Photopharmacology." International Journal of Molecular Sciences 22, no. 20 (2021): 11033. http://dx.doi.org/10.3390/ijms222011033.

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The synthesis of photoswitchable azo-dibenzo[b,f]oxepine derivatives and microtubule inhibitors were described. Subsequently, we examined the reaction of methoxy derivative 3-nitrodibenzo[b,f]oxepine with different aldehydes and in the presence of BF3·OEt2 as a catalyst. Our study provided a very concise method for the construction of the azo-dibenzo[b,f]oxepine skeleton. The analysis of products was run using experimental and theoretical methods. Next, we evaluated the E/Z isomerization of azo-dibenzo[b,f]oxepine derivatives, which could be photochemically controlled using visible-wavelength

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33

De, Sukanya, Moumita Jash, and Chinmay Chowdhury. "Palladium(ii) catalysed cascade strategy for the synthesis of dibenzo[5,6:7,8]cycloocta[1,2-b]indol-10-ols/-10(15H)-ones: easy access to 1,3,5,7-cyclooctatetraenes (COTs)." Chemical Communications 56, no. 100 (2020): 15659–62. http://dx.doi.org/10.1039/d0cc06538b.

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A palladium(ii)-catalysed synthesis of dibenzo[5,6:7,8]cycloocta[1,2-b]indol-10-ols and dibenzo[5,6:7,8]-cycloocta[1,2-b]indol-10(15H)-ones and an acid-mediated transformation of the former compound into COTs are described.

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34

Collins, DJ, GD Fallon, A. Staffa, and H. Tope. "Stereochemistry of the Dihydro Compound From Lithium/Ammonia Reduction of 3-Methoxy-7,8,9,10-tetrahydro-6H-dibenzo[b,d]pyran-6-one." Australian Journal of Chemistry 49, no. 6 (1996): 719. http://dx.doi.org/10.1071/ch9960719.

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X-Ray crystallography has established that the lithium/ammonia reduction of 3-methoxy-7,8,9,10-tetrahydro-6H-dibenzo[ b,d ]pyran-6-one gives the cis-dihydro compound (6aRS,10aSR)-3-methoxy-6a,7,8,9,10,10a-hexahydro-6H-dibenzo[ b,d ]pyran-6-one (7).

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35

Ventrice, Tina, Eva M. Campi, Gary D. Fallon та ін. "Evidence for C - H…O and C - H…π Hydrogen Bonding from Comparison of the Crystal Packing of Two Dibenzo-Azacrown Ethers". Australian Journal of Chemistry 55, № 12 (2002): 779. http://dx.doi.org/10.1071/ch02161.

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Crystal-packing data for a 17-membered ring NO4 dibenzo macrocycle shows interesting curvature complementarity, which is ascribed to intermolecular C–H…O and C–H…π interactions in contrast to a related 22-membered ring N2O4 dibenzo macrocycle which shows regular layer packing.

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36

Eiroa, Áurea Andrade, Esther Vázquez Blanco, Purificación López Mahía, Soledad Muniategui Lorenzo, Darío Prada Rodríguez, and Esther Fernández Fernández. "Error Propagation as a Factor in Selection of Measurement Intervals for the Determination of Polycyclic Aromatic Hydrocarbons by Second-Derivative Spectrofluorimetry." Journal of AOAC INTERNATIONAL 83, no. 4 (2000): 977–84. http://dx.doi.org/10.1093/jaoac/83.4.977.

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Abstract The most suitable wavelength intervals were selected for the determination of 4 polycyclic aromatic hydrocarbons (PAHs; benzo[g,h,i]perylene, dibenzo[a,h]anthracene, pyrene, and triphenylene) in very complex mixtures of 11 PAHs: anthracene, benz[a]anthracene, benzo[a]pyrene, benzo[b]fluoranthene, benzo[g,h,i]perylene, benzo[k]fluoranthene, chrysene, dibenz[a,h]anthracene, phenanthrene, pyrene, and triphenylene. The multiple linear regression algorithm was applied to measurements made in several wavelength intervals previously selected on the basis of sensitivity and minimum number of

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37

Ghetu, Maria-Cristina, Marian Virgolici, Alina Tirsoaga та Ioana Stanculescu. "Molecular Modelling of Polychlorinated Dibenzo-p-Dioxins Non-Covalent Interactions with β and γ-Cyclodextrins". International Journal of Molecular Sciences 24, № 17 (2023): 13214. http://dx.doi.org/10.3390/ijms241713214.

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Polychlorinated dibenzo-p-dioxins (PCDD) are persistent organic pollutants which result as byproducts in industrial or combustion processes and induce toxicity in both wildlife and humans. In this study, all seven PCDD, tetrachlorinated dibenzo-p-dioxins (TCDD), pentachlorinated dibenzo-p-dioxins (P5CDD), hexachlorinated dibenzo-p-dioxins (H6CDD), heptachlorinated dibenzo-p-dioxins (H7CDD), and octachlorinated dibenzo-p-dioxins (OCDD) were studied in interaction with two cyclodextrins, β-CD and γ-CD, resulting in a total of 40 host–guest complexes. The flexibility of the cyclodextrins was give

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38

Budanow, Alexandra, Hans-Wolfram Lerner, and Michael Bolte. "Two salts of the 6,6-difluoro-6H-dibenzo[c,e][1,2]oxaborinin-6-ide anion with different cations." Acta Crystallographica Section E Crystallographic Communications 76, no. 12 (2020): 1837–40. http://dx.doi.org/10.1107/s2056989020015066.

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The crystal structures are reported of the 6,6-difluoro-6H-dibenzo[c,e][1,2]oxaborinin-6-ide (or 9,9-difluoro-10-oxa-9-boraphenanthren-9-ide) anion with two different cations, namely, potassium 6,6-difluoro-6H-dibenzo[c,e][1,2]oxaborinin-6-ide, K+·C12H8BF2O−, (II), featuring a polymeric structure, and bis(tetraphenylphosphonium) bis(6,6-difluoro-6H-dibenzo[c,e][1,2]oxaborinin-6-ide) acetonitrile trisolvate, 2C24H20P+·2C12H8BF2O−·3CH3CN, (III), which is composed of discrete cations, anions and acetonitrile solvent molecules linked by C—H...O, C—H...N and C—H...F hydrogen bonds. There are only m

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39

Irdhawati, Irdhawati, Ni Ketut Shinta Mas Methaninditya, and Anak Agung Bawa Putra. "Carbon Paste Electrode Modified by Dibenzo-18-crown-6 for the Determination of Paracetamol Using Differential Pulse Voltammetry Technique." Indonesian Journal of Chemistry 23, no. 1 (2023): 53. http://dx.doi.org/10.22146/ijc.74393.

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The fabrication, optimization and validation of measurement using a modified carbon paste electrode (CPE) with dibenzo-18-crown-6 were carried out for the determination of paracetamol in commercial products. The pH, dibenzo-18-crown-6 concentration in carbon paste, and scan rate parameters were optimized. Validation of the measurement was observed from linear concentration range, LoD, LoQ, precision, and percentage of the recovery. The result showed that the optimum pH was at 2, the optimum concentration of dibenzo-18-crown-6 in carbon paste was 0.6%, optimum scan rates were 35 mV/s for CPE, a

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40

Kariya, Viral, and Manhar Parsania. "SYNTHESIS AND ANTIMICROBIAL ACTIVITY OF CHALCONES, PHENYLPYRIMIDINES DERIVATIVES BEARING DIBENZO [B,F][1,4]THIAZEPINES." International Journal of Advanced Research 12, no. 02 (2024): 144–52. http://dx.doi.org/10.21474/ijar01/18276.

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Chalcones, Phenylpyrimidines derivatives showed remarkable therapeutic activity, with a view of getting to synthesis11-chlorodibenzo[b,f][1,4]thiazepine (1), 1-(4-(dibenzo[b,f][1,4]thiazepin-11-yloxy)-3-methoxyphenyl)ethan-1-one (2),(E)-1-(4-(dibenzo[b,f][1,4]thiazepin-11-yloxy)-3-methoxyphenyl)-3-(4-aryl)prop-2-en-1-ones(3a-3j) &4-substituted-6-(4-(dibenzo[b,f][1,4]thiazepin-11-yloxy)-3-methoxyphenyl)pyrimidin-2(1H)-ones (4a-4j) have been synthesized, All the synthesized compounds were characterized by TLC, IR, 1H NMR, Mass spectral data. All the synthesized compounds (3a-3j) & (4a-4j

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41

Bedford, Colin T. "An Efficient, Large-Scale Synthesis of Cytenamide." Journal of Chemical Research 42, no. 3 (2018): 153–55. http://dx.doi.org/10.3184/174751918x15218087557053.

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Dibenzosuberenone (5 H-dibenzo[a,d]cyclohepten-5-one) was reduced to the corresponding alcohol by sodium borohydride/MeOH and converted to the corresponding 5-chloro compound by thionyl chloride/benzene, treatment of which with CuCN/toluene gave the corresponding nitrile. Hydrolysis by ethanolic KOH yielded the corresponding amide, cytenamide (5 H-dibenzo[a,d]cycloheptene-5-carboxamide).

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42

Rioseras-Garcia, Maria-Jesús J., and Jose-Maria Hernando-Huelmo. "Study of Energies and Geometries of Dibenzo[a,h]pyrene, Its Epoxides and Related Compounds." Collection of Czechoslovak Chemical Communications 66, no. 4 (2001): 631–40. http://dx.doi.org/10.1135/cccc20010631.

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A conformational study of energies and geometries of stable compounds obtained from dibenzo[a,h]pyrene by enzymatic treatment with oxygen was carried out using the semiempirical AM1 quantum mechanical method. The energies of possible isomers are strongly dependent on the position occupied by the oxygen atom in the epoxides obtained from dibenzo[a,h]pyrene.

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43

Samita, Fidelis N., Louis P. Sandjo, Isaiah O. Ndiege, Ahmed Hassanali, and Wilber Lwande. "Zanthoxoaporphines A–C: Three new larvicidal dibenzo[de,g]quinolin-7-one alkaloids from Zanthoxylum paracanthum (Rutaceae)." Beilstein Journal of Organic Chemistry 9 (February 27, 2013): 447–52. http://dx.doi.org/10.3762/bjoc.9.47.

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The bioassay-guided purification of Zanthoxylum paracanthum (Rutaceae) extracts led to the isolation of three new alkaloids, namely 1-hydroxy-10-methoxy-7H-dibenzo[de,g]quinolin-7-one (zanthoxoaporphine A, 2), 1-hydroxy-7H-dibenzo[de,g]quinolin-7-one (zanthoxoaporphine B, 3) and 1,8-dihydroxy-9-methoxy-7H-dibenzo[de,g]quinolin-7-one (zanthoxaporphine C, 4), and a known lignan identified as sesamin (1). Isolation and purification of the constituent compounds was achieved through conventional chromatographic methods. The chemical structures of the isolated compounds were determined on the basis

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44

Vasilevsky, Sergey, Ol’ga Krivenko, Irina Sorokina, Dmitry Baev, Tatyana Tolstikova, and Igor Alabugin. "Cascade Transformations of 1-R-Ethynyl-9,10-anthraquinones with Amidines: Expanding Access to Isoaporphinoid Alkaloids." Molecules 26, no. 22 (2021): 6883. http://dx.doi.org/10.3390/molecules26226883.

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The interaction of acetamidine and phenylamidine with peri-R-ethynyl-9,10-anthraquinones in refluxing n-butanol leads to the formation of cascade transformations products: addition/elimination/cyclization―2-R-7H-dibenzo[de,h]quinolin-7-ones and(or) 2-R-3-aroyl-7H-dibenzo[de,h]quinolin-7-ones. The anti-inflammatory and antitumor properties of the new 2-R-7H-dibenzo[de,h]quinolin-7-ones were investigated in vivo, in vitro, and in silico. The synthesized compounds exhibit high anti-inflammatory activity at dose 20 mg/kg (intraperitoneal injection) in the models of exudative (histamine-induced) an

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45

Pickardt, Joachim, Sven Wiese, and Pirka Wischlinski. "Reaktionen von Cadmium-und Quecksilber(II)halogeniden und -pseudohalogeniden mit Kronenethern: Kristallstrukturen der Komplexe von Benzo-18-krone-6 mit CdX2 und HgX2 (X = CI, Br) und von Dibenzo-18-krone-6 mit Hg(CN)2 / Reactions of Cadmium and Mercury(II) Halides and Pseudohalides with Crown Ethers: Crystal Structures of the Complexes of Benzo-18-crown-6 with CdX2 and HgX2 (X = Cl, Br) and of Dibenzo-18-crown-6 with Hg(CN)2." Zeitschrift für Naturforschung B 52, no. 11 (1997): 1296–300. http://dx.doi.org/10.1515/znb-1997-1102.

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Abstract The reactions of benzo-18-crown-6 with MeX2 (Me = Cd, Hg; X = Cl. Br), and of dibenzo-18-crown-6 with Hg(CN)2 afford the compounds [Me(benzo-18-crown-6)X2] (1-4) and [Hg(dibenzo-18-crown-6)(CN)2 (5), resp., the crystal structures of which were determined. They consist of isolated neutral molecules, the crystalline Cd complexes and 5 contain one molecule of water of crystallization per formula unit, which however is not coordinated to the metal atom. The metal atoms are coordinated by the six O atoms of the ligands and the two halide atoms, or the two CN groups for 5, resp., the coordi

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46

Lada, E., A. Urbanczyk, and MK Kalinowski. "Polarographic Study of the Complexation of Na+ and K+ Ions by Dibenzo-18-crown-6 in Non-Aqueous Solution." Australian Journal of Chemistry 43, no. 12 (1990): 2003. http://dx.doi.org/10.1071/ch9902003.

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Complexes of Na+ and K+ ions with dibenzo-18-crown-6 (6,7,9,10,17,18,20,21-octahydro-dibenzo[ b,k ] [1,4,7,10,13,16] hexaoxacyclooctadecin ) were studied by polarography in several non-proton-donating media. Their stability constants are strongly influenced by the solvents, and vary inversely with the Gutmann donicity scale and with the Persson HDS parameter which is a measure of the hardness for these solvents.

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47

Hellwinkel, Dieter, Peter Ittemann, and Siegbert Bohnet. "Dibenzo[b,g]heterocin-5,7-dione / Dibenzo[b.g] heterocine-5,7-diones." Zeitschrift für Naturforschung B 40, no. 6 (1985): 858. http://dx.doi.org/10.1515/znb-1985-0631.

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Abstract Dibenzo[b,g]heterocine-5,7-diones are synthesized by intramolecular ester condensations. Ring inversions of their distorted boat conformations occur with activation barriers of 10-15(42-62) kcal(kJ)/mole.

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48

Katz, A. "Dibenzo[a,l]pyrene (dibenzo[def,p]chrysene): fjord-region distortions." Carcinogenesis 19, no. 9 (1998): 1641–48. http://dx.doi.org/10.1093/carcin/19.9.1641.

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49

Akishina, E. A., E. A. Dikusar, G. N. Lysenko, et al. "Catalytic Synthesis of 14-Substituted 14H-Dibenzo[a,j]xanthenes Using Sulfonic Cation Exchanger FIBAN K-1." Russian Journal of General Chemistry 95, no. 6 (2025): 1559–68. https://doi.org/10.1134/s1070363225602182.

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Abstract A new method was developed for obtaining dibenzo[a,j]xanthenylphenols by condensation of natural and synthetic hydroxybenzaldehydes with β-naphthol in boiling trichloroethylene using the sulfonic cation exchanger FIBAN-K1 as a catalyst. The esters were prepared by acylation of dibenzo[a,j]xanthenylphenols with nicotinic, isonicotinic and 1,2-azole-3-carboxylic acid chlorides in methylene chloride in the presence of triethylamine.

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50

Detellier, Christian, and Marc Robillard. "39K and 13C nuclear magnetic resonance studies of the potassium cation – dibenzo-30-crown-10 complex in solution." Canadian Journal of Chemistry 65, no. 7 (1987): 1684–87. http://dx.doi.org/10.1139/v87-282.

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The structure and microdynamics in solution of the dibenzo-30-crown-10–potassium thiocyanate complex have been studied by 39K and 13C nuclear magnetic resonance. In the four solvents studied (nitromethane, acetonitrile, acetone, and pyridine), the large crown ether wraps around the potassium cation and expels the conjugate anion and the solvent molecules from the cation coordination sphere. Measurements of 39K quadrupolar and 13C dipole–dipole relaxation times in acetone-d6 gave the effective correlation time of the complex and the 39K quadrupolar coupling constant (1.4 ± 0.3 MHz). The compari

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