ARTICLES

Filter  
Active filters 0
Remove
  

Refine your searches by:

Collections
Education
Research
Technology
Religion
Architecture and Urbanism
Social Sciences
Biology
Chemistry
Public health
Literature
all records (75)

Languages
English
Spanish
Portuguese
German
French

Countries
Indonesia
Brazil
USA
Cuba
Ukraine
South Africa
Italy
Spain
Chile
Argentina
all records (81)

Years
2023
2022
2021
2020
2019
2018
2017
2016
2015
2014
all records (24)

Filter  
 
275.875  Articles
1 of 27.589 pages  |  10  records  |  more records»
[2+3] Dipolar cycloadditions of aromatic nitrile oxides to abietic acid esters were investigated. The reactions showed complete site selectivity and regioselectivity, while the stereoselectivity depended on the structures of the dipolarophiles.

[3+2] Cycloaddition reactions of 2-(trifluoroacetyl)vinyl ethyl ether (1) to substituted and unsubstitued 2-arylidene-5-oxopyrazolidin-2-ium-1-ides (2a–e) were studied using density functional theory (DFT) methods at the cc-pVDZ level. The mechanistic det... see more

West Nile virus (WNV) is among the other four flavivirus genus, rapidly spreading worldwide. The number of cases increases globally as there are no clinically available approved drugs and vaccines against this disease. Based on our previous finding relate... see more

Aim. To extend the synthetic limits of the reaction of the electrophilic intramolecular cyclization (EIC) on the examples of 5,5-disubstituted and 5-yliden substituted 3-allyl-2-thiohydantoins and the directed structural modification of 2-halogenomethyl-2... see more

In this work, the synthesis of novel triazole derivatives with barbi­turic motifs in good yields is described. The alkyne was prepared through the Knoevenagel reaction of barbituric derivatives with ortho and para O-propar­gylated hydroxybenzaldehyde. The... see more

Les approches relatives à la synthèse organique, fondées sur des réactions de cycloaddition ont pris ces dernières années une importance considérable. En effet la synthèse des composés hétérocycliques à cinq chainons tels que les isoxazolidines fait souve... see more

s-

Các 1-Aryl-1-(2-thienyl)eten ph?n ?ng v?i 2,4-pentandion ho?c etylacetoacetat trong acid acetic sôi du?i s? có m?t c?a mangan triacetat dihydrat d? cho các 4,5-dihydrofuran m?i có ch?a vòng 2-thienyl ? v? trí 5. M?t khác, các eten này cung ph?n ?ng t... see more

Novel 1,3-oxazepine derivatives have been synthesis via (2+5) cycloaddition reaction of imines and selected cyclic carboxylic acid anhydrides by refluxing in dry benzene. Imines have been prepared by thermal condensation of 4-methyl aniline and para subst... see more

1 of 27.589 pages  |  10  records  |  more records»