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2,4-Dinitrophenylhydrazine (2,4-DNPH or DNPH) is the organic compound C 6 H 3 (NO 2) 2 NHNH 2. DNPH is a red to orange solid. It is a substituted hydrazine.
The 2,4-dinitrophenylhydrazine tests for carbonyl compounds; The iodoform reaction tests for the presence of methyl ketones, or compounds which can be oxidized to methyl ketones; The Schiff test detects aldehydes; Tollens' reagent tests for aldehydes (known as the silver mirror test) The Zeisel determination tests for the presence of esters or ...
Hydrazines (R 2 N−NR 2) are a class of chemical compounds with two nitrogen atoms linked via a covalent bond and which carry from one up to four alkyl or aryl substituents. Hydrazines can be considered as derivatives of the inorganic hydrazine (H 2 N−NH 2), in which one or more hydrogen atoms have been replaced by hydrocarbon groups. [1]
2,4-Dinitrophenylhydrazine#Brady's test; Retrieved from "https: ... Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; ...
Phenol in the Berthelot reagent can be replaced by a variety of phenolic reagents, the most common being sodium salicylate, which is significantly less toxic. [1] This has been used for blood urea nitrogen (BUN) determinations and commonly is used to determine water and soil total and ammonia-N. Replacement of phenol by 2-phenylphenol reduces interferences by a variety of soil and water ...
2,4-DNP can mean: 2,4-Dinitrophenol , a small organic molecule formerly marketed as a pharmaceutical "diet aid" 2,4-Dinitrophenylhydrazine , Brady's reagent, used in organic chemical analysis
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The dilute nature of the DPPH radicals (one unpaired spin per 41 atoms) results in a relatively small linewidth (1.5–4.7 G). The linewidth may however increase if solvent molecules remain in the crystal and if measurements are performed with a high-frequency EPR setup (~200 GHz), where the slight g -anisotropy of DPPH becomes detectable.