hydroxylamine hydrochloride

hydroxylamine hydrochloride

[‚hī‚dräk′sil·ə‚mēn ‚hī·drə′klȯr‚īd]
(organic chemistry)
(NH2OH)Cl A crystalline substance with a melting point of 151°C; soluble in glycerol and propylene glycol; used as a reducing agent in photography and in synthetic and analytic chemistry, as an antioxidant in fatty acids and soaps, and as a reagent for enzyme reactivation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The conventional methods employed for the synthesis of substituted isoxazole-5(4H)ones, include cyclization of O-propioloyl oximes [27], reaction of ethyl acetoacetate and hydroxylamine hydrochloride followed by the Knoevenagel condensation with aromatic aldehydes in two steps [28-30], condensation of substituted benzaldoximes and 1,3-dicarbonyl compounds [31], and reaction of [beta]-oxoesters with hydroxylamine and sodium hydroxide with subsequent addition of aqueous HCl followed by heating [32].
In conclusion, we report the reaction of dielectrophilic precursor 4,4,4-trifluoro-3,3-dihydroxy-2-methyl-1-(thien-2-yl)-1-butanone with hydroxylamine hydrochloride to regiospecifically produce a diasteroisomeric mixture of 5-trifluoromethyl-5-hydroxy-4-methyl-3-(thien-2-yl)-4,5-dihy droisoxazole, demonstrating a degree of diastereoselectivity through cyclocondensation reactions; we also reacted it with hydrazine hydrochloride to produce aromatic 5-trifluoromethyl-4-methyl-3-(thien-2-yl)-1H-pyrazoles.
A solution of furo[2,3-d][1,3]oxazin-4-one 3 (1.5g, 5mmol) and hydroxylamine hydrochloride (0.34 g, 5mmol) in pyridine (10 mL) was heated under reflux for 3 hrs.
Effect of Hydroxylamine Hydrochloride Concentration and Tensile Strength.
(number 52 Ningbo Road, Shanghai, China); silver nitrate ([greater than or equal to] 99%), hydroxylamine hydrochloride ([greater than or equal to] 99%), 3-aminopropyltrimethoxysilane (APTMS, 97%), and furazolidone (ACS grade) were obtained from Sigma-Aldrich (St.
The mixture of 0.25M hydroxylamine hydrochloride (N[H.sub.2]OH x HCl) and 0.25 M HCl extracted a comparatively high fraction (21.1%) of As.
We added 100 [micro]L of hydroxylamine hydrochloride (20 g/L in pyridine) to the vial, vortex-mixed it for 30 s, and then reacted the mixture for 2 min in a microwave oven (200 W, 25% of total exit power).
to another method using an acetate buffer with hydroxylamine hydrochloride. In this study, blood was harvested from undescribed sources.
1997), CBD- and oxalate-extractable Al ([Al.sub.d] and [Al.sub.o]; Bertsch and Bloom 1996), and neutral ammonium acetate-hydroquinone and hydroxylamine hydrochloride extractable Mn ([Mn.sub.q] and [Mn.sub.h]; Gambrell 1996) were also identified (Table 2).
One method uses an acetate buffer (pH 4.5) with 15 g/L hydroxylamine hydrochloride (Sigma Diagnostics) to release the iron from transferrin (10).