Topic
Reagent
About: Reagent is a research topic. Over the lifetime, 60091 publications have been published within this topic receiving 1234928 citations. The topic is also known as: reagens.
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TL;DR: In this article, the determination of arsenic, bismuth, germanium, antimony, selenium, tin and tellurium by reaction with sodium borohydride in dilute hydrochloric acid followed by measurement with atomic-absorption spectrophotometry in an argon-hydrogen flame was made.
Abstract: A study has been made of the determination of arsenic, bismuth, germanium, antimony, selenium, tin and tellurium by conversion into the hydrides by reaction with sodium borohydride in dilute hydrochloric acid followed by measurement with atomic-absorption spectrophotometry in an argon-hydrogen flame. A general study, involving 48 elements, of interferences has been carried out and it has been shown that significant interference occurs in many instances but that the procedure is simple to carry out and gives a considerable increases in sensitivity and detection limits for the elements listed, with the exception of tin, for which high blank values were obtained owing to the presence of tin in the sodium borohydride reagent.
237 citations
TL;DR: In this article, the reaction of azodye active yellow lightfast 2 KT (AYL) with H2O2/Fe2+ system (Fenton's reagent) causes a drop in colourization by 95-97% at the minimum dosage of 17 mg·l−1 H 2O2.
237 citations
TL;DR: In this paper, the surface coverage varies from 0.74 to 1.85 silyl groups/nm 2.8 nm according to the BJH pore size analysis of the desorption branch.
Abstract: Disilazane reagents of type HN(SiR1R22)2 carrying organic substituents R1,2 = H, Me, Ph, n-Bu, n-Oct, Vin (Vin = vinyl) of varying longitudinal and lateral extension are reacted with high quality MCM-41 samples of different pore sizes, i.e., effective pore diameters of 2.8 and 3.8 nm according to the BJH pore size analysis of the desorption branch. The reaction of the standard silylating reagent hexamethyldisilazane, HN(SiMe3)2, is shown to be controlled by the amount of added silylamine and the contact time, resulting in effective pore size engineering. Calculations from elemental analysis revealed that the degree of silylation (silylation efficiency) and hence the surface hydroxyl consumption depend on the steric bulk/shape of the groups R. The surface coverage varies from 0.74 to 1.85 silyl groups/nm2. The sterically least demanding tetramethyldisilazane, HN(SiHMe2)2, is the most efficient silylating reagent, while silyl groups with bulky phenyl substituents produce the lowest surface coverage featurin...
237 citations
TL;DR: The N-F reagent family of 1-alkyl-4-fluoro-1,4-diazabicyclo[2.2] octane salts 8d has been found to be very effective for the fluorination of a wide variety of organic substrates, such as steroidal enol acetates and silyl enol ethers, phenyl-substituted olefins, sulfides bearing α-H atoms, and mildly activated aromatic compounds as discussed by the authors.
Abstract: The new «N-F»-type electrophilic reagent family of 1-alkyl-4-fluoro-1,4-diazabicyclo[2.2.2]octane salts 8d (derived from elemental fluorine (F 2 ) and 1-alkyl-1,4-diazabicyclo[2.2.2]octane salts) has been found to be very effective for the fluorination of a wide variety of organic substrates. These include steroidal enol acetates and silyl enol ethers, phenyl-substituted olefins, sulfides bearing α-H atoms, certain carbanions, and mildly activated aromatic compounds. The products were obtained with good yields and regioselectivity under very mild reaction conditions
236 citations
TL;DR: A copper-catalyzed process for trifluoromethylation of aryl, heteroaryl, and vinyl boronic acids has been developed and shows tolerance to moisture and a variety of functional groups.
235 citations