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Journal articles on the topic '3-Dibromo-5'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Capon, RJ, and JK Macleod. "Two Epimeric Dibromo Nitriles From the Australian Sponge Aplysina laevis." Australian Journal of Chemistry 40, no. 2 (1987): 341. http://dx.doi.org/10.1071/ch9870341.

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Two dibromo nitriles, (1′R,5′S,6′S)-2-(3′,5′-dibromo-1′,6′-dihydroxy-4′-oxocyclohex-2′- enyl) acetonitrile (5) and the (l′R,5′R,6′S) epimer (6), possessing antimicrobial activity, have been isolated from the sponge Aplysina laevis (Carter). Cometabolites (+)-aeroplysinin-1 (1) and the dibromo ketone (2) were also identified. Structures (5) and (6) were assigned on the basis of spectroscopic evidence and synthesis from (1).

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2

Komal, Savaliya, and S. Patel Pankaj. "Synthesis and Biological evaluation Of Some New Benzoyl Pyrazole Derivatives bearing a 6,8-Dibromo-2-methylquinazolin-4-one Moiety." Der Pharma Chemica 14, no. 2 (2022): 6. https://doi.org/10.4172/0975-413X.14.2.1-5.

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A new series of 3-[4-(1-benzoyl-5-(substitutedphenyl)-4,5-dihydro-pyrazol-3-yl)phenyl]-6,8-dibromo-2-methylquinazolin-4-one have been synthesized by the condensation reaction of 6,8-dibromo-3-{4-[5-(substitutedphenyl)-4,5-dihydro-pyrazol-3-yl]phenyl}-2-methylquinazolin-4-one with benzoyl chloride by using pyridine as a solvent. The intermediate have been synthesized by refluxation of 6,8-dibromo-3-{4-[3- (substitutedphenyl)prop-2-enoyl]phenyl}-2-methylquinazolin-4-one (0.01M) and 99% hydrazine hydrate (0.015M) by using ethanol (50ml) as a solvent with various aldehydes. The chemical structures

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3

Savaliya, Komal, and S. Patel Pankaj. "Synthesis and Biological evaluation Of Some New Benzoyl Pyrazole Derivatives bearing a 6,8-Dibromo-2-methylquinazolin-4-one Moiety." Der Pharma Chemica 14, no. 2 (2022): 6. https://doi.org/10.5281/zenodo.13353950.

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A new series of 3-[4-(1-benzoyl-5-(substitutedphenyl)-4,5-dihydro-pyrazol-3-yl)phenyl]-6,8-dibromo-2-methylquinazolin-4-one have been synthesized by the condensation reaction of 6,8-dibromo-3-{4-[5-(substitutedphenyl)-4,5-dihydro-pyrazol-3-yl]phenyl}-2-methylquinazolin-4-one with benzoyl chloride by using pyridine as a solvent. The intermediate have been synthesized by refluxation of 6,8-dibromo-3-{4-[3- (substitutedphenyl)prop-2-enoyl]phenyl}-2-methylquinazolin-4-one (0.01M) and 99% hydrazine hydrate (0.015M) by using ethanol (50ml) as a solvent with various aldehydes. The chemical structures

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4

Percino, Teresa Mancilla, Marisol López Martínez та José Luis León. "Diastereoselective Synthesis of β-Hydroxyketones". Natural Product Communications 3, № 3 (2008): 1934578X0800300. http://dx.doi.org/10.1177/1934578x0800300305.

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The diastereoselective synthesis of 2,4-dibromo-3-hydroxy-1,3-diphenylbutan-1-one [4(a-a’)]; 2,4-dibromo-3-hydroxy-1,3-di [( p-chloro)phenyl]butan-1-one [5(a-a’)] and 2,4-dibromo-3-hydroxy-1,3-di[( p-phenyl)phenyl]butan-1-one [6(a-a’)] using (N→B) phenyl( N-methyliminodiacetate- O,O',N)borane and n-BuLi is reported. The mixture of these compounds was characterized by 1H, 13C NMR, HETCOR, COSY and infrared spectroscopy and mass spectrometry.

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5

(Miss), A.M. DAVE, N. BHATT K., K. UNDAVIA N., and B. TRIVEDI P. "Synthesis of 1-(Arylideneaminoethyl)-2-phenyl-4-(3',5'-dibromo-2" -hydroxy benzylidene )imidazolin-5-ones." Journal of Indian Chemical Society Vol. 64, Jun 1987 (1987): 348–50. https://doi.org/10.5281/zenodo.6238210.

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University Department of Chemistry, Bhavnagar University, Bhavnagar-364 002 <em>Manuscript received 12 January 1987, accepted 19 May 1987</em> 1-(Aryl ideneam ino ethyl)-2-phenyl-4-(3',5'-dibromo-2'-hydroxyhenzylidene)imidazolin-5-ones were synthesised by the condensation of 2-pheny1-4-(3',5'-dibromo-2'-hydroxybenzylidene)oxazoiin-5-one and ethylenediamine in pyridine, followed by reaction with the appropriate aldehyde in ethanol containing a few drops of glacial acetic acid. The compounds were screened for their antibacterial activity.

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6

D., H. Vyas, D. Tala S., F. Dhaduk M., D. Akbari J., and S. Joshi H. "Synthesis, antitubercular and antimicrobial activities of some new pyrazoline and isoxazole derivatives." Journal of Indian Chemical Society Vol. 84, Nov 2007 (2007): 1140–44. https://doi.org/10.5281/zenodo.5824658.

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Department of Chemistry, Saurashtra University, Rajkot-360 005, Gujarat, India <em>E-mail </em>: drhsjoshi49@gmail.com <em>Manuscript received 23 November 2006, revised 6 June 2007, accepted 17 August 2007</em> Cyclocondensation of hydrazine hydrate with (2<em>E</em>)-1-(3,5 dibromo-4-methoxyphenyl)-3-aryl-prop-2-en-1-ones (1a-j) in glacial acetic acid afford corresponding 1-acetyl-3-(3,5-dibromo-4-methoxyphenyl)-5-aryl-4,5-dihydro-1<em>H</em>-pyrazoles (2a-j). While the compounds 1a-j on reaction with hydroxylamine hydrochloride in presence of acetic acid and sodium acetate to give 3-(3,

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7

Wang, Zi Xuan, Yu Chuan Li, Hong Xu Niu, Hong Xia Yu, and Si Ping Pang. "Synthesis and Crystal Structures of Dibromo-Triazoles and their Amination." Materials Science Forum 1001 (July 2020): 93–103. http://dx.doi.org/10.4028/www.scientific.net/msf.1001.93.

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Triazole heterocyclic compounds have a wide range of applications in the fields of medicine, pesticide, energetic materials, etc. Introducing halogen atoms and amino groups into the triazole ring can obtain a series of important intermediates that can be further modified. 4,5-Dibromo-1-H-1,2,3-triazole (5), 3,5-dibromo-1-H-1,2,4-triazole (6), 3,5-dibromo-4-H-1,2,4-triazole (7) and 1-amino-4,5-dibromo-1,2,3-triazole (8), 2-amino-4,5-dibromo-1,2,3-triazole (9) and 1-amino-3,5-dibromo-1,2,4-triazole (10) were synthesized through the bromination and amination of 1,2,3-triazole (1), 1-amino-1,2,3-t

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8

Shaala, Lamiaa A., Sherief I. Khalifa, Mostafa K. Mesbah, Rob W. M. Van Soest, and Diaa T. A. Youssef. "Subereaphenol A, a new Cytotoxic and Antimicrobial Dibrominated Phenol from the Red Sea Sponge Suberea Mollis." Natural Product Communications 3, no. 2 (2008): 1934578X0800300. http://dx.doi.org/10.1177/1934578x0800300222.

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An investigation of the sponge Suberea mollis collected at the Egyptian Red Sea coast afforded a new cytotoxic and antimicrobial dibrominated phenol, subereaphenol A (1), together with the previously reported compounds 2-(3′,5′-dibromo-2′-hydroxy-4′-methoxyphenyl)acetamide (2), dibromoverongiaquinol (3), bromochloroverongiaquinol (4), and 2-(3′,5′-dibromo-4′-ethoxy-1′-hydroxy-4′-methoxy-2′,5′-cyclohexadien-1-yl)acetamide (5). The structure of the compounds was determined by a combination of 1D and 2D NMR techniques and High-resolution mass spectral determinations. Complete and new NMR data for

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9

Parvez, Masood, SM Humayan Kabir, Ted S. Sorensen, Fang Sun та Brian Watson. "Assigning structures to diastereomeric aliphatic α,α'-dibromo ketones". Canadian Journal of Chemistry 80, № 4 (2002): 413–17. http://dx.doi.org/10.1139/v02-033.

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X-ray crystal structures are reported for two symmetrical aliphatic α,α'-dibromo ketones: a meso diastereomer of 3,5-dibromo2,2,6,6-tetramethylheptan-4-one, and a rac isomer of 4,6-dibromo2,2,3,3,7,7,8,8-octamethylnonan-5-one. Using these secure assignments and a previously confirmed structure for the diastereomers of 2,4-dibromopentan-3-one, we show in this study that gas-liquid chromatography (GLC) retention times (meso > rac) can be used to confidently assign the diastereomers for a range of symmetrical and unsymmetrical aliphatic α,α'-dibromo ketones. 1H NMR chemical shifts for the &g

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10

Wilkie, JS, and KN Winzenberg. "Preparation of Some 9-Hydroxy-2-oxaspiro[4.5]dec-8-ene-1,7-dione Derivatives by Reductive Alkylation of 3,5-Dimethoxybenzoic Acid With 1,2-Dihaloalkane and Oxiran Electrophiles." Australian Journal of Chemistry 42, no. 8 (1989): 1207. http://dx.doi.org/10.1071/ch9891207.

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Lithium in liquid ammonia mediated reductive alkylation of 3,5-dimethoxybenzoic acid (3) with 1,2-dibromoethane, or 1-bromo-2-chloroethane, followed by acid hydrolysis, afforded 9-hydroxy-2-oxaspiro[4.5]dec-8-ene-1,7-dione (1a). Reductive alkylation of (3) with unbranched 1,2-dibromoaikanes (5b-g), 1,2-dibromo-3-methylbutane and 1,2-dibromo-3,3-dimethylbutane gave 3-alkyl-9-hydroxy-2-oxaspiro[4.5]dec-8-ene-1,7-dione derivatives (1b-i) in moderate yields with the exception of (1i). The major product of the last reaction was 1-(2-bromo-3,3- dimethylbutyl )-3-hydroxy-5-oxocyclohex-3-ene-1-carboxy

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11

Alferova, Diana A., Elena N. Svechnikova, Marharyta M. Suleiman, et al. "Reationary ability of 3, 5-Dibromo-N-Phenylanthranilic acids Derivatives." Research Journal of Pharmacy and Technology 11, no. 9 (2018): 3947. http://dx.doi.org/10.5958/0974-360x.2018.00725.4.

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12

Roşca, Sorin, Marian Olaru, Ciprian I. Raţ, and Cristian Silvestru. "3,5-Dibromo-2′,3′,4′,5′,6′-pentamethyl-1,1′-biphenyl." Acta Crystallographica Section E Structure Reports Online 66, no. 6 (2010): o1248. http://dx.doi.org/10.1107/s1600536810015308.

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13

Fun, Hoong-Kun, Samuel Robinson Jebas, Ibrahim Abdul Razak, M. S. Karthikeyan, P. S. Patil, and S. M. Dharmaprakash. "2,3-Dibromo-1-(2,4-dichloro-5-fluorophenyl)-3-phenylpropan-1-one." Acta Crystallographica Section E Structure Reports Online 64, no. 6 (2008): o1039. http://dx.doi.org/10.1107/s1600536808013238.

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14

Arivazhagan, M., and R. Meenakshi. "Quantum chemical studies on structure of 1-3-dibromo-5-chlorobenzene." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 82, no. 1 (2011): 316–26. http://dx.doi.org/10.1016/j.saa.2011.07.055.

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15

Shahani, Tara, Hoong-Kun Fun, Nithinchandra, and Balakrishna Kalluraya. "2,3-Dibromo-3-(5-nitro-2-furyl)-1-phenylpropan-1-one." Acta Crystallographica Section E Structure Reports Online 67, no. 3 (2011): o546. http://dx.doi.org/10.1107/s1600536811003552.

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16

Pranab, Ghosh, Debnath Utpal, and Prasad Pradhan Bhim. "Bromination of cholest-4-en-3,6-dione with N-bromosuccinimide in chloroform." Journal of Indian Chemical Society Vol. 90, Apr 2013 (2013): 533–37. https://doi.org/10.5281/zenodo.5771284.

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Natural Product and Polymer Chemistry Laboratory, Department of Chemistry, University of North Bengal, Darjeeling-734 013, West Bengal, India <em>E-mail</em> : pizy12@yahoo.com <em>Manuscript received 15 December 2011, revised 20 March 2012, accepted 07 June 2012</em> The reaction of cholest-4-en-3,6-dione (1) with <em>N</em>-bromosuccinimide in chloroform furnishes four compounds which have been identified as 2,7α.-dibromo-cholest-1,4-dien-3,6-dione (2), 2,2,7α.-tribromo-cholest-4-en-3,6-dione (3), 2α., 7α.-dibromo-cholest-4-en-3,6-dione (4) and 2,2-dibromo-7-hydroxyl

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17

S., Sheik Mansoor, Logaiya K., P. N. Sudhan S., Aswin K., and Nasir Ahmed R. "An efficient synthesis of 1,2-dihydro-1-aryl-3H-naphth[1,2-e][1,3]oxazin-3-one derivatives catalysed by 1,3-dibromo-5,5-dimethylhydantoin/kaolin under solvent-free conditions." Journal of Indian Chemical Society Vol. 91, Dec 2014 (2014): 2283–89. https://doi.org/10.5281/zenodo.5746517.

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Bioactive Organic Molecule Synthetic Unit, Research Department of Chemistry, C. Abdul Hakeem College, Melvisharam-632 509, Tamilnadu, India <em>E-mail</em> : smansoors2000@yahoo.co.in <em>Manuscript received online 21 May 2014, revised 03 July 2014, accepted 17 July 2014</em> A mild and efficient method has been developed for the preparation of 1,2-dihydro-1-aryl-3<em>H</em>-naphth[1,2- e][1,3]oxazin-3-one derivatives from the reaction of aromatic aldehydes with β-naphthol and urea in the presence of 1,3-dibromo 5,5-dimethylhydantoin (DBH), as an efficient, inexpensive catalyst under ther

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18

SHAFIULLAH, A. ANSARI JAVED, and A. ANSARI SHAHID. "Bromination of Steroidal-6-ketoximes." Journal of Indian Chemical Society Vol. 65, Apr 1988 (1988): 271–72. https://doi.org/10.5281/zenodo.6035391.

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Steroid Research Laboratory, Department of Chemistry, Aligarh Muslim University, Aligarh-202 002 <em>Manuscript received 28 January 1988, accepted 19 February 1988</em> Bromination of 5α-cholestan-6-one oxime (1) with <em>N</em>-bromosuccinimide in carbon tetrachloride using benzoyl peroxide as a catalyst gave 6<em>β</em>-nitro-7α-bromocholest-4-ene (4), 7-bromocholesta-4,7-dien-6-one (5), 5α-cholestan-6-one (6) and 6-nitrocholest-5- ene (7). 3<em>β</em>-Chloro-5α-cholestan-6-one oxime (2) on similar treatment afforded 3<em>β</em>-chloro-5-bromo-5&al

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19

Sun, Shi, Corene Canning, Kuiwu Wang, et al. "Antibacterial Activity of 2-(3’,5'-Dibromo-2'-methoxyphenoxy)-3,5-dibromophenol Isolated from Phyllospongia papyracea." Natural Product Communications 12, no. 4 (2017): 1934578X1701200. http://dx.doi.org/10.1177/1934578x1701200426.

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A principal active antimicrobial compound, 2-(3’,5'-dibromo-2'-methoxyphenoxy)-3,5-dibromophenol, was isolated from the methanol extract of Phyllospongia papyracea via bioassay-guided fractionation and isolation. The crude extract and the purified compound were assayed to determine the minimal inhibitory concentration and minimal bactericidal concentration (MBC) using the broth microdilution method. The purified compound was found to be highly active against Bacillus subtilis and Staphylococcus aureus at MIC=1 μg/mL, Campylobacter jejuni at MIC=2 μg/mL, Pseudomonas aeruginosa at MIC=4 μg/mL, a

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20

S., Kothari, Singhal M., Vijayvergia D., Vyas R., and L. Verma B. "Synthesis and biocidal activity of some new 2-amino-4,6-diarylsubstituted-pyrimidines." Journal of Indian Chemical Society Vol. 77, Jul 2000 (2000): 329–31. https://doi.org/10.5281/zenodo.5867166.

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Department of Chemistry, Faculty of Science, M. L. Sukhadia University, Udaipur-313 002, India <em>Manuscript received 17 November 1999, accepted 23 March 2000</em> The chalcones (3a-q), derived from 3,5-dibromo-4-hydroxyacetophenone (Ia), 3,5-dibromo-2-hydroxyacet!)phenone (1b), 3-bromo-5- chloro-/5-methyl-2-hydroxyacetophenones (1c,d) and 4-(4'-nitrophenoxy)acetophenone (1e) and prepared by Claisen-Schmidt condensation with different substituted aromatic aldehydes (2a-f) in presence of base, on treatment with guanidine nitrate in ethanol and base give new 2-amino-4,6-diaryl-sub

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21

Huang, Chi Bao, Dao Sheng Yi, and Tang Mao Liu. "The Molecular Structures of Alpha-Brominated 2,5-Dimethyl-Terephthalonitrile Derivatives and the Dependences of Their Yields on the Reaction Time." Advanced Materials Research 476-478 (February 2012): 1178–85. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.1178.

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The number and molecular structures of the alpha-brominated 2,5-dimethylterephthalonitrile (DMT) derivatives and the dependences of the yields of derivatives on the reaction time were systematicaly investigated by means of NMR spectroscopy, MS and chromatography. The alpha-brominated DMT derivatives were comprised of 2-bromomethyl-5-methylterephthalonitrile (1), 2,5-bis(bromomethyl)terephthalonitrile (2), 2-(1,1-dibromo)methyl-5-methylterephthalonitrile (3) and 2-bromomethyl-5-(1,1-dibromo)methylterephthalonitrile (4). More than 90 % of DMT mainly transformed swiftly into 1 during the first tw

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22

Stoermer, Martin, and John Pinhey. "2(S,R),3(R,S)-2,3-Dibromo-3-methyl-5-phenyl-2-pentanoic Acid." Molecules 3, no. 8 (1998): M55. http://dx.doi.org/10.3390/m55.

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23

Stoermer, Martin, and John Pinhey. "2(R,S),3(S,R)-2,3-Dibromo-3-methyl-5-phenyl-2-pentanoic Acid." Molecules 3, no. 8 (1998): M56. http://dx.doi.org/10.3390/m56.

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24

BHADANGE, R. E., and R. P. GANORKAR. "Synthesis of 3-bromo Flavones from 2-Hydroxy-3, 5-dibromo-4nitro Dibenzoyl Methane." Oriental Journal Of Chemistry 28, no. 3 (2012): 1471–73. http://dx.doi.org/10.13005/ojc/280351.

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25

Kim, Seung-Hoi. "Utilization of Zinc Dust for a Core Monomer 2-Bromo-3-hexylthien-5-ylzinc Bromide: Its Synthesis and Application for the Preparation of Regioregular Poly(3-hexylthiophene)." International Journal of Polymer Science 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/847309.

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The oxidative insertion of readily available zinc dust into the carbon-bromine bond of 2,5-dibromo-3-hexylthiophene was efficiently achieved to provide 2-bromo-3-hexylthien-5-ylzinc bromide (I), which was utilized for the preparation of highly regioregular poly(3-hexylthiophene) (P3HT) in the presence of catalytic amounts of Ni-catalyst.

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26

Jongaramruong, J., A. J. Blackman, B. W. Skelton, and A. H. White. "Chemical Relationships between the Sea Hare Aplysia parvula and the Red Seaweed Laurencia filiformis from Tasmania." Australian Journal of Chemistry 55, no. 4 (2002): 275. http://dx.doi.org/10.1071/ch01171.

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One new 5-acetoxy-2,10-dibromo-3-chloro-7,8-epoxy-α-chamigrene (1) and three known sequiterpenes, namely 2,10-dibromo-3-chloro-7-chamigrene (2), deoxyprepacifenol (3), and pacifenol (4), were isolated from both the sea hare Aplysia parvula and the red seaweed Laurencia filiformis. On the other hand, pentadecanal and its aldol product (E)-2-tridecyl-2-heptadec-2-enal (6) were only separated from L. filiformis while the previously known fimbrolide (5) from Delisea sp. and the known purple pigment, aplysioviolin (7), were isolated only from the sea hare A. parvula. The structure of aplysioviolin

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27

Haghdadi, Mina, Hamed Amani, and Nasim Nab. "Theoretical study on the Diels-Alder reaction of bromo-substituted 2H-pyrane-2-ones and some substituent vinyls." Journal of the Serbian Chemical Society 80, no. 9 (2015): 1139–48. http://dx.doi.org/10.2298/jsc141205014h.

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A DFT study of the reactivity, regio- and stereoselectivity of Diels-Alder reaction between 3-bromo, 5-bromo, and 3,5-dibromo-2(H)-pyran-2-ones and some weakly activated and unactivated alkenes has been carried out using density functional theory (DFT). Four possible reaction channels, which are related to the formation of meta- and para- and endo- and exo-cycloadducts have been explored and characterized. The energy and natural bond orbital analysis shows that the meta-regioselectivity on the exo pathway is preferred and follows an asynchronous concerted mechanism with a polar nature in all D

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28

Kaur, Manpreet, Charan Kamal Saini, and Amandeep Kaur. "SYNTHESIS AND CHARACTERIZATION OF 4- AMINO-3, 5- DIBROMO- TOLUENE FROM P-TOLUIDINE." Journal of Applied Pharmaceutical Sciences and Research 4, no. 1 (2021): 13–18. http://dx.doi.org/10.31069/japsr.v4i1.3.

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Introduction: O-toluidine is an organic compound with the chemical formula CH3C6H4NH2. It is the most important of the three isomer toluidines. It is a colorless liquid although commercial samples are often yellowish. It is a precursor to the herbicides metolachlor and acetochlor. Toluene, formally known as toluol, is a clear, water-insoluble liquid with the typical smell of paint thinners. Materials and Methods: Chemically it is a mono-substituted benzene derivative that is one in which a single hydrogen atom from the benzene molecule has been replaced by a univalent group, in this case, CH3.

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29

Dhanasekaran, V., D. Gayathri, D. Velmurugan, K. Ravikumar, and M. S. Karthikeyan. "2,3-Dibromo-3-(4-chlorophenyl)-1-(2,4-dichloro-5-fluorophenyl)propan-1-one." Acta Crystallographica Section E Structure Reports Online 63, no. 5 (2007): o2493—o2494. http://dx.doi.org/10.1107/s1600536807017357.

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30

Wang, Zhi-Gang, Zong-Lin Xia, Rong Wang, and Ming-Li Wang. "4-[6,8-Dibromo-2-(2-chloro-5-nitrophenyl)-1,2,3,4-tetrahydroquinazolin-3-yl]cyclohexanol." Acta Crystallographica Section E Structure Reports Online 66, no. 5 (2010): o1205—o1206. http://dx.doi.org/10.1107/s1600536810015023.

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31

Fun, Hoong-Kun, Tara Shahani, Nithinchandra, and Balakrishna Kalluraya. "2,3-Dibromo-1-(4-methylphenyl)-3-(5-nitrofuran-2-yl)propan-1-one." Acta Crystallographica Section E Structure Reports Online 67, no. 1 (2010): o79. http://dx.doi.org/10.1107/s1600536810050488.

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32

Narayana, B., Anil N. Mayekar, H. S. Yathirajan, B. K. Sarojini, and Maciej Kubicki. "2,3-Dibromo-3-(5-bromo-2-methoxyphenyl)-1-(2,4-dichlorophenyl)propan-1-one." Acta Crystallographica Section E Structure Reports Online 63, no. 11 (2007): o4362. http://dx.doi.org/10.1107/s1600536807050842.

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In the title molecule, C16H11Br3Cl2O2, the chain Br atoms are in trans positions [Br—C—C—Br torsion angle is 179.0 (2)°]. The two benzene rings make a dihedral angle of 39.54 (15)°. The crystal packing is determined by van der Waals forces; some weak π–π interactions between the benzene rings of neighbouring molecules are also possible [the distance between their centroids is 3.753 (5) Å]. Intermolecular C—H...Br interactions are also present.

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33

Fun, Hoong-Kun, Ching Kheng Quah, Shobhitha Shetty, and Balakrishna Kalluraya. "2,3-Dibromo-3-(5-nitro-2-furyl)-1-(4-nitrophenyl)propan-1-one." Acta Crystallographica Section E Structure Reports Online 66, no. 12 (2010): o3128. http://dx.doi.org/10.1107/s1600536810044971.

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34

Fun, Hoong-Kun, Chin Sing Yeap, Shobhitha Shetty, and Balakrishna Kalluraya. "2,3-Dibromo-1-(4-chlorophenyl)-3-(5-nitro-2-furyl)propan-1-one." Acta Crystallographica Section E Structure Reports Online 66, no. 12 (2010): o3220. http://dx.doi.org/10.1107/s1600536810046829.

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35

Schröck, Robert, Alexander Sladek, and Hubert Schmidbaur. "1,2-Di(silyl)benzene and 1,4-Dibromo-2,5-di(silyl)benzene." Zeitschrift für Naturforschung B 49, no. 8 (1994): 1036–40. http://dx.doi.org/10.1515/znb-1994-0805.

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1,2-Di(silyl)benzene (3), has been prepared in a three-step process starting with the reaction of 1,2-dibromobenzene and p-tolyl(chloro)silane with magnesium in tetrahydrofuran. which affords 1,2-bis(p-tolylsilyl)benzene (1) as a stable high-yield intermediate. Compound 1 has been converted into 1,2-bis(trifluoromethanesulfonatosilyl)benzene (2) with trifluoro- methanesulfonic acid, and finally into 3 by reduction with lithiumaluminiumhydride, both again in high yields. - In an attempt to prepare 1,2,4,5-tetra(silyl)benzene in an analogous way. only the bis-silylated species could be obtained

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36

Kamada, Takashi, and Charles Santhanaraju Vairappan. "New Laurene-type Sesquiterpene from Bornean Laurencia nangii." Natural Product Communications 10, no. 6 (2015): 1934578X1501000. http://dx.doi.org/10.1177/1934578x1501000610.

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We report the chemical composition of a population of Bornean Laurencia nangii Masuda. A new compound, neolaurene (1), along with five known metabolites, neolaurallene (2), 2,10-dibromo-3-chloro-α-chamigrene (3), deoxyprepacifenol (4), cycloelatanene B (5) and intricatetraol (6), were isolated and their chemical structures elucidated based on spectroscopic data. In addition, their cytotoxicity and antibacterial activity were evaluated.

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37

Xynas, R., and RJ Capon. "Two New Bromotyrosine-Derived Metabolites From an Australian Marine Sponge, Aplysina sp." Australian Journal of Chemistry 42, no. 8 (1989): 1427. http://dx.doi.org/10.1071/ch9891427.

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Two new bromotyrosine-derived secondary metabolites, aplysamine-1 (5) and aplysamine-2 (6), were isolated from an Australian marine sponge, Aplysina sp. The structures were assigned on the basis of detailed spectroscopic analysis, and the tertiary amine salt character was revealed by conversion into the corresponding free tertiary amines. Cooccurring with (5) and (6) were the known antibiotic compounds (+)-aeroplysinin (1) and (3′,5′-dibromo-4′-ethoxy-1′-hydroxy-4′-methoxycyclohexa-2′,5′-dienyl)acetamide (2).

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38

Rocchi, Damiano, Juan González, and J. Menéndez. "Ethyl 4,4''-Dibromo-5'-(butylamino)-2',6'-dinitro-[1,1':3',1''-terphenyl]-4'-carboxylate." Molbank 2015, no. 1 (2015): M848. http://dx.doi.org/10.3390/m848.

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39

Yathirajan, H. S., Anil M. Mayekar, B. Narayana, B. K. Sarojini, and Michael Bolte. "2,3-Dibromo-3-(5-bromo-6-methoxy-2-naphthyl)-1-(2,4-dichlorophenyl)propan-1-one." Acta Crystallographica Section E Structure Reports Online 63, no. 5 (2007): o2345. http://dx.doi.org/10.1107/s1600536807015759.

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40

Fun, Hoong-Kun, Tara Shahani, Nithinchandra, and Balakrishna Kalluraya. "4-[2,3-Dibromo-3-(4-bromophenyl)propanoyl]-2-phenyl-1,2,3-oxadiazol-2-ium-5-olate." Acta Crystallographica Section E Structure Reports Online 66, no. 11 (2010): o2818—o2819. http://dx.doi.org/10.1107/s1600536810040493.

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41

Wang, Zhen, and Qingjian Liu. "4-(3,5-Dibromo-4-hydroxyphenyl)-3-butoxycarbonyl-5-ethoxycarbonyl-2-methyl-6-phenyl-1,4-dihydropyridine." Molbank 2011, no. 2 (2011): M724. http://dx.doi.org/10.3390/m724.

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42

Leznoff, Clifford C., Dmitri S. Terekhov, Colin R. McArthur, Steven Vigh, and Jing Li. "Multisubstituted phthalonitriles, naphthalenedicarbonitriles, and phenanthrenetetracarbonitriles as precursors for phthalocyanine syntheses." Canadian Journal of Chemistry 73, no. 3 (1995): 435–43. http://dx.doi.org/10.1139/v95-057.

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Electrophilic aromatic nitration under mild conditions of 4-hydroxyphthalonitrile gave 4-hydroxy-3-nitrophthalonitrile and 4-hydroxy-5-nitrophthalonitrile, while bromination yielded 3-bromo-4-hydroxyphthalonitrile, 4-bromo-5-hydroxyphthalonitrile, and 3,5-dibromo-4-hydroxyphthalonitrile. Iodination gave 4-hydroxy-5-iodophthalonitrile and 4-hydroxy-3,5-diidophthalonitrile. Coupling of 4-iodophthalonitrile, 3-iodophthalonitrile, and 5-iodo-2,3-dicyanonaphthalene with trans-1,2-bis(tri-n-butylstannyl)ethene gave trans-1,2-bis(3,4-dicyanophenyl)ethene, trans-1,2-bis(2,3-dicyanophenyl)ethene, and t

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43

Coll, JC, BW Skelton, AH White, and AD Wright. "Tropical Marine Algae. V. The Structure Determination of Two Novel Sesquiterpenes From the Red Alga Laurencia tenera (Rhodophyceae, Ceramiales, Rhodomelaceae)." Australian Journal of Chemistry 42, no. 10 (1989): 1695. http://dx.doi.org/10.1071/ch9891695.

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Laurencia tenera has been shown to contain two novel sesquiterpenes. The structure of the less abundant metabolite (3) was determined by single-crystal X-ray diffraction as (1S,2R,4S,5R,6R,8S,9R)-4,8-dibromo-2,5,6,9-tetramethyltricyclo[7.2.0.01.6] undecane-3-one.‡ The more abundant, but less stable metabolite (4) was investigated by extensive high-field N.M.R. spectroscopy. Its structure is proposed as (1S*,2R*,4R*,5R*,6R*,8R*)-4-bromo-2,5,6-trimethyl-11-methylenetricyclo[6.2.1.01.6]undecan-3-one.§ The sesquiterpene (3) is isomeric with the known metabolite perforatone (5).

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44

Coetzee, Karolien, Christoph E. Strasser, Stephanie Cronje, and Helgard G. Raubenheimer. "Dinuclear Gold Complexes of Two Simple but Underutilized Dicarbanionic Ligand Types." Zeitschrift für Naturforschung B 64, no. 11-12 (2009): 1449–57. http://dx.doi.org/10.1515/znb-2009-11-1227.

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Both mono- and bisylide zwitterionic complexes of gold(I), [(C6F5){PhCH(PPh3)}Au] (4), [(C6F5)2(C6H4-p){CH(PPh3)}2Au5] (5) and [(C6F5)2(C6H4-m){CH(PPh3)}2Au2] (6) were prepared by THT substitution in [C6F5(THT)Au] (THT = tetrahydrothiophene) using deprotonated mono- and bis-phosphonium salts. Lithiation of 4,4'-dibromo-2,3,5,6,2',3',5',6'-octafluoro-1,1_- biphenyl and transmetallation with [Cl(Ph3P)Au] produced a dinuclear gold complex of octafluorosubstituted biphenyl [[(PPh3)2(C6F4-C6F4)2Au2]] (8)

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45

V., G. KULKARNI, and V. JADHAV G. "INTERACTION OF HYDROXYACETOPHENONES AND THEIR DERIVATIVES AND THIONYL CHLORIDE IN PRESENCE OF FINELY DIVIDED COPPER. PART IX. PREPARATION OF 3: 3'-DIACETYL-4: 4'-DIHYDROXY-6: 6'-DIMETHYL- DIPHENYL SULPHIDE AND 3: 3'-DIACETYL-4 :4'-DIMETHLY-6 : 6'-DIHYDROXY- DIPHENYL SULPHIDE AND THEIR DERIVATIVES." Journal of Indian Chemical Society Vol. 33, July 1956 (2022): 519–22. https://doi.org/10.5281/zenodo.6576175.

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Preparation of 3: 3<em>'</em>-diacetyl-4 : 4<em>'</em>-dihydroxy-6: 6<em>'</em>-dimethyldiphenyl sulphide (I) and 3 :3<em>'</em>-diacetyl 4 :4<em>'</em>-dimethyl-6 :6<em>'</em>-dihydroxydiphenyl sulphide (II) is described. Bromination furnishes the corresponding dibromo sulphides which on nitration yield 2-bromo-3-methyl-4:6-dinitrophenol. Nitration of both the sulphides affords 2 : 4 : 6-trinitro-3-methylphenol as the final product, but in the case of the sulphide (II) dinitrosulphide and 2-methyl-3: 5<em>-</em>dinitro-4-hydroxy-acetophenone have also been is

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46

Ali, M. H., J. Hedell, and T. Wencewicz. "Oxidation of sulfides to sulfoxides with 1, 3-dibromo-5, 5-dimethylhydantoin in the presence of hydrated silica gel." Journal of Sulfur Chemistry 30, no. 2 (2009): 160–66. http://dx.doi.org/10.1080/17415990902725691.

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47

Prashant, R. Latthe, R. Kamble Ravindra, and V. Badami Bharati. "Ring transformation reactions of 3-[3/4-acetylphenyl] sydnones; synthesis of oxime, hydrazone and dibromo derivatives of 3-[3/4-acetylphenyl] sydnones and 3-[3/4-acetylphenyl]-5-methyl-[1,3,4]oxadiazolin-2-ones." Journal of Indian Chemical Society Vol. 82, Jul 2005 (2005): 654–58. https://doi.org/10.5281/zenodo.5830564.

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Department of Chemistry, Karnatak University, Dharwad-580 003, India <em>E-mail</em>: bbadami@rediffmail.com Yuvaraja's College, University of Mysore, Mysore-570 005, India <em>Manuscript received 9 June 2004. revised 18 December 2004, accepted 22 March 2005</em> The oximes (3 and 4) and hydrazone (5a,b and 6a,b) derivatives of <em>m/p</em>-acetylphenylsydnones (1 and 2) have been subjected to one-pot ring conversion to the 3-[<em>m</em>/p-acetylphenyl]-5-methyl[1,3,4joxadiazolin-2-ones (7, 8, 9a,b and 10a,b). The ¤, ß unsaturated ketones (11a-h and 12a-h) obtained by the Clai

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48

Do, Thanh-Hung, Thuc-Huy Duong, Huy Truong Nguyen, et al. "Biological Activities of Lichen-Derived Monoaromatic Compounds." Molecules 27, no. 9 (2022): 2871. http://dx.doi.org/10.3390/molecules27092871.

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Lichen-derived monoaromatic compounds are bioactive compounds, associated with various pharmacological properties: antioxidant, antifungal, antiviral, cytotoxicity, and enzyme inhibition. However, little is known about data regarding alpha-glucosidase inhibition and antimicrobial activity. Very few compounds were reported to have these activities. In this paper, a series of monoaromatic compounds from a lichen source were isolated and structurally elucidated. They are 3,5-dihydroxybenzoic acid (1), 3,5-dihydroxybenzoate methyl (2), 3,5-dihydroxy-4-methylbenzoic acid (3), 3,5-dihydroxy-4-methox

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49

Bassioni, Ghada, Fernando S. Delgado, Matthieu Jaeggy, Frank H. Köhler, Stefan Nogai, and Catalina Ruiz-Pérez. "9-Oxabicyclo[3.3.1]nona-2, 6-diene. Short Access and Allylic Bromination." Zeitschrift für Naturforschung B 60, no. 11 (2005): 1143–48. http://dx.doi.org/10.1515/znb-2005-1106.

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9-Oxabicyclo[3.3.1]nona-2, 6-diene (3) has been synthesized from cycloocta-1, 5-diene in two steps in an overall yield of 88%. The dihedral-angle dependence of its 1H solution NMR data and the double signal set of its 13C CP MAS NMR spectrum correspond to the results of the single crystal structure analysis. Reaction of 3 with N-bromosuccinimide in the presence of sodium peroxodisulfate or benzoylperoxide has led in good yield to a dibromo derivative 4, and a tribromo derivative 5, respectively. Compounds 4 and 5 feature two allylic bromine substituents, while an additional vinylic bromine ato

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50

Bytheway, IR, EL Ghisalberti, S. Gotsis, et al. "The Chemistry of Eremophila Spp. XXIX. The Absolute Configuration of (+)-Syringaresinol Dimethyl Ether." Australian Journal of Chemistry 40, no. 11 (1987): 1913. http://dx.doi.org/10.1071/ch9871913.

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The absolute configuration of the title compound has been established from a single-crystal room temperature X-ray structure determination of its dibromo derivative, C24H28Br2O8. Crystals of the latter are orthorhombic, space group P21212, a l6.696(5), b l5.660(3), c 4.713(1) �, Z 2; 1452 independent 'observed' reflections yielded R 0.033 following full-matrix least-squares refinement. The molecule lies on a crystallographic 2 axis. The occurrence of lignans in Eremophila species is summarized.

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