Results 121 to 130 of about 20,504 (258)

Studies with Arylhydrazono-3-oxopropanals:A novel route to synthesis of substituted pyrazoles, oxoalkanonitrile and glyoxalonitrile containing sulfa drug moieties [PDF]

open access: yes, 2008
Coupling of enaminones 1 with diazonium salts gave thehydrazonopropanals 3a-h. Compound 3 react with ω-bromoacetophenone or α-chloroacetanilide to yield 5 and 8. These compounds were cyclized smoothly into 6 and 9 respectively.
Abdel Hafiz, I.S.   +4 more
core  

Molecular Structure of Heterocycles: 6. Solvent Effects on the 17O Nmr Chemical Shifts of 5-Trichloromethylisoxazoles

open access: yesJournal of the Brazilian Chemical Society, 2001
A multilinear-regression analysis using the Kamlet-Abboud-Taft (KAT) solvatochromic parameters in order to elucidate and quantify the solvent effects on the 17O chemical shifts of three 5-trichloromethylisoxazoles [(1a) non-, (1b) 3-methyl- and (1c) 4 ...
Martins Marcos A. P.   +7 more
doaj  

Synthesis of some isoxazoline, isoxazole and pyrazole carboxylic acids as the precursors of new 1,2-diacyl-1-alkylhydrazines [PDF]

open access: yes, 2013
A number of isoxazoline, isoxazole and pyrazole carboxylic acids or their esters has been synthesized via the 1,3-dipolar cycloaddition of corresponding nitrile oxides or diazomethane to unsaturated dipolarophiles.
Antonevich, I. P., Katok, Ya. M.
core  

Synthesis and reactions of aminopropenes, which contains functional groups [PDF]

open access: yes, 2013
В рамках данной работы осуществлен синтез енаминов, содержащих остатки первичных, вторичных, третичных аминов, а также амидную и тиоамидную группы. Проведено комплексное исследование структуры полученных соединений с помощью спектральных методов, включая
Lugovik, K. I., Луговик, К. И.
core  

Syntheses of [1]Benzopyrano[4,3-c]pyrazoles and -[3,4-d]isoxazoles [PDF]

open access: bronze, 1981
Tomio Shimizu   +4 more
openalex   +1 more source

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