Results 91 to 100 of about 2,558 (239)

Chemistry of the Enaminone of 1-Acetylnaphthalene under Microwave Irradiation Using Chitosan as a Green Catalyst

Molecules, 2011
Enaminone 1 was reacted with hydrazonoyl halides 2a-d to yield 3,4-disubstituted pyrazoles 6a-d. Coupling with arenediazonium chlorides afforded the 2-(arylhydrazono)-3-(1-naphthalenyl)-3-oxopropionaldehydes 13a-c.
Huwaida M. E. Hassaneen
doaj   +1 more source

Direct catalytic photodecarboxylative amination of carboxylic acids with diazirines: Divergent access to amines, hydrazines, and nitrogen-containing heterocycles

Amines, hydrazines, and nitrogen-containing heterocycles are pivotal species in medicine, agriculture, fine chemicals, and materials. Diazirines have been recently reported to serve as versatile electrophilic amination reagents for the synthesis of ...
Justin, Lopchuk, Paresh, Athawale, Preeti, Chandrachud, Vishala, Maharaj   +3 more
core   +1 more source

Products from Hydrazines : Carbonyl Derivatives of Some α-Benzamido-β-phenylacrylohydrazides

, 1965
Products from Hydrazines : Carbonyl Derivatives of Some α-Benzamido-β ...
K. P. Sharma, D. S. Deorha
core   +1 more source

Green Fuel Combustion Synthesis of CeO2 and Ag/CeO2 Nanoparticles for Photocatalytic and Antibacterial Applications

Asia-Pacific Journal of Chemical Engineering, EarlyView.
ABSTRACT Silver‐doped cerium oxide nanoparticles (Ag/CeO2 NPs) were synthesized using Ricinus communis seed extract as a bio‐derived fuel in a solution combustion method. The combustion reaction, carried out at 450°C with AgNO3 and (NH4)2[Ce (NO3)6] as metal precursors, produced CeO2 and Ag/CeO2 NPs.
T. N. Ravishankar, J. R. Adarsha, R. Mohan Reddy, S. Harisha, A. Ananda, B. M. Shilpa   +5 more
wiley   +1 more source

Regioselective hydroamination of unactivated olefins with diazirines as a diversifiable nitrogen source

Nature Communications
Nitrogen-containing compounds, such as amines, hydrazines, and heterocycles, play an indispensable role in medicine, agriculture, and materials. Alkylated derivatives of these compounds, especially in sterically congested environments, remain a challenge
Qingyu Xing, Preeti P. Chandrachud, Khalilia Tillett, Justin M. Lopchuk   +3 more
doaj   +1 more source

A convenient four-component one-pot strategy toward the synthesis of pyrazolo[3,4-d]pyrimidines

Beilstein Journal of Organic Chemistry, 2015
An efficient one-pot synthesis of pyrazolo[3,4-d]pyrimidine derivatives by the four-component condensation of hydrazines, methylenemalononitriles, aldehydes and alcohols has been developed via two different reaction pathways.
Mingxing Liu, Jiarong Li, Hongxin Chai, Kai Zhang, Deli Yang, Qi Zhang, Daxin Shi   +6 more
doaj   +1 more source

Unexpected Reduction of Ethyl 3-Phenylquinoxaline-2- carboxylate 1,4-Di-N-oxide Derivatives by Amines

Molecules, 2008
The unexpected tendency of amines and functionalized hydrazines to reduceethyl 3-phenylquinoxaline-2-carboxylate 1,4-di-N-oxide (1) to afford a quinoxaline 1c andmono-oxide quinoxalines 1a and 1b is described. The experimental conditions werestandardized
Antonio Monge, Ignacio Aldana, Silvia Pérez-Silanes, Beatriz Solano, Esther Vicente, Lidia M. Lima   +5 more
doaj   +1 more source

Chlorella vulgaris biorefineries: sustainable biofuels and high‐value carbon capture

Biofuels, Bioproducts and Biorefining, EarlyView.
Abstract Global reliance on fossil fuels has created urgent economic and environmental challenges, yet large‐scale use of algal biomass remains limited by production costs. Industrial scaling is constrained by inefficient harvesting and the technical challenges of processing recalcitrant cell walls.
Sandyelle Ferreira Alcântara Araújo, Antonio Átila Menezes Ferreira, Lucia Andrea Sindeaux de Oliveira, Dayana Nascimento Dari, Devany Quintela Soares, Eliana Elisa Francelino Mavie, Francisco Leonardo Alves de Moraes Sousa, Jessica Lopes da Silva, João Vitor Gomes de Araújo Silva, Thiago Queiroz da Silva, Ana Karine Portela Vasconcelos, Kelma Maria dos Santos Pires Cavalcante, John Hebert da Silva Felix, José Cleiton Sousa dos Santos   +13 more
wiley   +1 more source

Direct Cyclization/Chlorination Strategy of Hydrazines for Synthesis of 4-Chloropyrazoles by TCCA

Molecules
A new method for synthesis of various 4-chloropyrazoles through the direct cyclization/chlorination of hydrazines by using 1,3,5-trichloroisocyanuric acid (TCCA) as both oxidant and chlorinating agent under mild conditions has been proposed. Based on the
Qingfu Deng, Chenglong Ma, Liangzhen Hu, Yan Xiong   +3 more
doaj   +1 more source

Occupational exposure to hydrazines [PDF]

"NIOSH recommends that employee exposure in the workplace to hydrazine, methylhydrazine, 1,1-dimethylhydrazine, 1,2-dimethylhydrazine, and phenylhydrazine, and their salts formed by addition with acids, such as sulfates, hydrochlorides, or hydrobromides,

core   +1 more source