Results 21 to 30 of about 4,019 (241)

CHEMICAL COMPOSITION OF PETROLEUM FROM KRAPIVINSKOE OILFIELD (MESSAGE 5)

Известия Томского политехнического университета: Инжиниринг георесурсов, 2022
The relevance. Accumulation of data on the structure of asphaltenes of methane-naphthenic oil of the Krapivinskoe oil field from the Upper Jurassic deposits in the territory of the Tomsk region is one of the conditions necessary for solving problems ...
Tatyana V. Cheshkova, Elena Yu. Kovalenko, Tatyana A. Sagachenko, Raisa S. Min   +3 more
doaj   +1 more source

fluorenes, and Indenes Triggered by Simple Lewis Acid

, 2022
This report illustrates BF3·OEt2 promoted intramolecular cascade cycloaromatization of 1,7-ynones toward synthesizing structurally diverse benzofluorene scaffolds.
Dakoju Ravi Kishore, Komal Goel (12034816), Gedu Satyanarayana, Gedu Satyanarayana (552837), Chander Shekhar, Dakoju Ravi Kishore (10953431), Komal Goel, Chander Shekhar (716422)   +7 more
core   +1 more source

A facile synthesis of novel indole derivatives as potential antitubercular agents

Journal of Taibah University for Science, 2017
A novel series of 5,5-dimethyl-11-phenyl-4b,5,5a,10,10a,11,11a,12-octahydro-10,11,12-triaza-indeno[2,1-b]fluorenes 3a–3l were prepared by reacting oxindole, aryl amines and acetone using dibutylamine as an organocatalyst via simultaneous Knoevenagel ...
Gulzar A. Khan, Javeed A. War, Arun Kumar, Imtiyaz A. Sheikh, Aarti Saxena, Ratnesh Das   +5 more
doaj   +1 more source

Transient-axial-chirality controlled asymmetric rhodium-carbene C(sp2)-H functionalization for the synthesis of chiral fluorenes

Nature Communications, 2020
The formation of chiral molecules generally relies on direct chirality transfer from catalyst to products. Here, the authors report a strategy based on point chirality transfer from the catalyst to a dirhodium carbene intermediate with axial chirality ...
Kuiyong Dong, Xing Fan, Chao Pei, Yang Zheng, Sailan Chang, Ju Cai, Lihua Qiu, Zhi-Xiang Yu, Xinfang Xu   +8 more
doaj   +1 more source

Fluorenes and Styrenes by Au(I)-Catalyzed Annulation of Enynes and Alkynes [PDF]

, 2008
Intermolecular annulation of enynes and propargyl esters to selectively produce styrenes or fluorenes is reported. The divergent arene syntheses involve a Au-catalyzed, two-pot, multistep process proceeding by cis-diastereoselective cyclopropanation ...
Watson, Iain D.G., Toste, F. Dean, Gorin, David J.   +2 more
core   +1 more source

Synthesis of Fluorenes and Dibenzo[g,p]chrysenes through an Oxidative Cascade

, 2022
We have developed robust, operationally simple syntheses of fluorenes and of dibenzo­[g,p]­chrysenes through oxidative cascade processes. These structures that are commonly encountered in optoelectronic materials, dyes, and pharmaceutical products are ...
Marcus A. Tius, Marcus A. Tius (1621645), Cody F. Dickinson (11932639), Cody F. Dickinson, Glenn P. A. Yap (7424147), Glenn P. A. Yap   +5 more
core   +1 more source

Synthesis of 5-(2-methoxy-1-naphthyl)- and 5-[2-(methoxymethyl)-1-naphthyl]-11H-benzo[b]fluorene as 2,2'-disubstituted 1,1'-binaphthyls via benzannulated enyne–allenes

Beilstein Journal of Organic Chemistry, 2011
5-(2-Methoxy-1-naphthyl)- and 5-[2-(methoxymethyl)-1-naphthyl]-11H-benzo[b]fluorene were synthesized by treatment of the corresponding benzannulated enediynes with potassium tert-butoxide in refluxing toluene to give benzannulated enyne–allenes for the ...
Yu-Hsuan Wang, Joshua F. Bailey, Jeffrey L. Petersen, Kung K. Wang   +3 more
doaj   +1 more source

Liquid dosage forms with antibacterial activity

Aktualʹnì Pitannâ Farmacevtičnoï ì Medičnoï Nauki ta Praktiki, 2015
The development and implementation of effective liquid medicines with antiseptic action on the basis of new substances and their complex combinations into medical practice is an important task of modern pharmaceutical and medical science.
O. I. Mykhalyk
doaj   +1 more source

Bioactive fluorenes. Part III: 2,7-dichloro-9H-fluorene-based thiazolidinone and azetidinone analogues as anticancer and antimicrobial against multidrug resistant strains agents

BMC Chemistry, 2020
Background Thiazoles, thiazolidinones and azetidinones are highly ranked amongst natural and synthetic heterocyclic derivatives due to their great pharmaceutical potential.
Essam M. Hussein, Reem I. Alsantali, Moataz Morad, Rami J. Obaid, Hatem M. Altass, Ali Sayqal, Mohamed A. S. Abourehab, Amal A. Elkhawaga, Ahmed S. M. Aboraia, Saleh A. Ahmed   +9 more
doaj   +1 more source

Discovery of Stealthin Derivatives and Implication of the Amidotransferase FlsN3 in the Biosynthesis of Nitrogen-Containing Fluostatins

Marine Drugs, 2019
Diazobenzofluorene-containing atypical angucyclines exhibit promising biological activities. Here we report the inactivation of an amidotransferase-encoding gene flsN3 in Micromonospora rosaria SCSIO N160, a producer of fluostatins.
Chunshuai Huang, Chunfang Yang, Zhuangjie Fang, Liping Zhang, Wenjun Zhang, Yiguang Zhu, Changsheng Zhang   +6 more
doaj   +1 more source