Hydrochlorides formaldoxime

The presence of manganese can be detected by formation of the purple MnO upon oxidation using bismuth or periodate in acidic solution. A very sensitive test is the reaction of and formaldoxime hydrochloride in aqueous alkaline solution, which also leads to the production of a purple MnO ... 

ALKANOLAMNES - ALKANOLAMINESFROMNITRO ALCOHOLS] (Vol2) Formaldoxime hydrochloride... 

Solid formaldoxime hydrochloride, (CH2N0H)3.HC1. Dissolve 105 g of NH2OH.HCI in 110 ml of water. Add 45 g of paraformaldehyde, and stir. Heat the solution under reduced pressure ( 25 mm Hg) at about 40°C. When large quantities of crystals begin to precipitate, stop the heating, add 80 ml of anhydrous ethanol, and stir. Leave overnight, then filter off the... 

Interestingly, the oldest experimentally known isomer is formoxime (2), nowadays better known as formaldoxime (the oxime of formaldehyde—formaldehyde oxime), which was first synthesized as early as 1891. Scholl already reported that 2 is unstable with respect to slow polymerization, while Dunstan and Bossi were able to stabilize 2 as its hydrochloride salt and described its properties in 1898 . Dunstan and Bossi also reported the reaction of 2 HC1 with alkali metals yielding the sodium salt of 2, Na+ [H2C=NO] , which explodes when heated . Probably, this explosive statement was one of the first descriptions of a nitrosomethanide. 

Nitrosochloromethane, 0N.CH2.C1 mw 79-49, N 17.62% It yel crysts(bimolecuIar in soln, monomolecular when melted), possessing a sharp lacrimatory irritating smell, mp ca 62°(with blue coloration) decomp vigorously at 65 66° sol in org sol vs insol in w or cold NaOH can be prepd from trimolecular formaldoxime, (H2C NOH)3, but better from formaldehydeoxime-hydrochloride by reaction with nitrosyl chloride in ether under cooling (Refs 1 2)... 

A. Formaldoxime. A mixture of 11.5 g. (0.38 mole) of paraformaldehyde and 26.3 g. (0.38 mole) of hydroxylamine hydrochloride in 170 ml. of water is heated until a clear solution is obtained. Then there is added 51 g. (0.38 mole) of hydrated sodium acetate, and the mixture is boiled gently under reflux for 15 minutes to give a 10% solution of formaldoxime. 

Formaldoxime reagent Dissolve 10 g of hydroxylamine hydrochloride, NH2OH HCl, in ca. 80 mL of water. Finally, dilute to 100 mL with water. The reagent is stored in the dark and is stable for several months. 

Procedure. One drop each of formaldoxime reagent, aqueous ammonia (1 1), 0.2 M EDTA and 10% hydroxylamine hydrochloride are added to a drop of the test solution. An orange-red color indicates the presence of mangan-... 

Formaldoxime, isobted in a pure state by ether extraction of a reaction mixture of hydroxylamine hydrochloride and formaldehyde w hich has been neutrahaed mth the calculated amount of sodium carbonate, polymerizes to give triformosime, whose structure is indicated In the following equa-tion °. ... 

Hydro3Eylainiiie Hydrochloride Method. Occasionalh- useful for the estimation of formaldehyde in the presence of alkali sensiti -e product and impurities, such, as cresol, phenol, and resinous materials, is the method of Brochet and Cambier - - - based on the liberation of hi drochloric acid when hydroxylamine hydrochloride reacts with formaldehyde to form formaldoxime ... 

Manganese is determined colorimetrically hj the use of formaldoame reagent and sodium hydroxide . Formaldoxime reagent is prepared by dissohdng 3 parts of paraformaldehTde and 7 parts of hydrox> lamine hydrochloride in 5 parts of water. 

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