Iron acetate

Acetates. Anhydrous iron(II) acetate [3094-87-9J, Ee(C2H202)2, can be prepared by dissolving iron scraps or turnings in anhydrous acetic acid ( 2% acetic anhydride) under an inert atmosphere. It is a colorless compound that can be recrystaUized from water to afford hydrated species. Iron(II) acetate is used in the preparation of dark shades of inks (qv) and dyes and is used as a mordant in dyeing (see Dyes and dye intermediates). An iron acetate salt [2140-52-5] that is a mixture of indefinite proportions of iron(II) and iron(III) can be obtained by concentration of the black Hquors obtained by dissolution of scrap iron in acetic acid. It is used as a catalyst of acetylation and carbonylation reactions. 

Nitration of 9-methylpyrido[2,3-(t][l,5]benzoxazepin-5(6//)-one with nitronium tetrafluoro-borate gives exclusively the 7-nitro derivative 3, which is reduced to the amine 4 with iron/acetic acid.41... 

Fig. 14.21 Effect of H2S04 (stars) and of H2S04 + 5 vol% H202 (open squares) on the initial catalytic activity (dark squares) for type FeAc (iron acetate) and IFeTMPP (Fe tetramethoxyphenylporphyrin) catalysts (Reprinted from [219] with permission from Elsevier).

Fig. 11.20 shows the burning rates of an AP pyrolant without a catalyst and with 5 % of three different catalysts. Catocene is seen to be the most effective catalyst for increasing the burning rate as compared with iron acetate and carborane. The burning rate is increased threefold from 5 mm s to 15 mm s" at 1 MPa and the... 

Schnur and co-workers " summarized typical reactions that can be performed on functional groups of substituted 2,4-oxazolidinediones without ring opening. These reactions include reduction with iron-acetic acid, chlorosulfonation, nucleophilic displacements of aromatic fluorides, and acid hydrolysis with HCl/formic acid. Nonetheless, there are examples of useful ring cleavage reactions involving 2,4-oxazolidinediones. 

A nitrochromone has three easily reducible functions and, for its reduction, conditions and reagents which have little or no effect on the carbonyl or the 2,3-double bond should be chosen. Nitrochromones are reduced by tin-hydrochloric acid, zinc-ammonium chloride, iron-acetic acid, iron-hydrochloric acid or sodium dithionite. It may be easier to control the severity of the conditions in catalytic hydrogenation. Scheme 29 shows that with proper choice of conditions (temperature, pressure, solvent, catalyst), it is often possible to optimize the yield of the desired product (527). Extending the reaction time from about 30 min to 2.5 h increased the yield of the chromanone (528) and none of the hydroxylamine (529) was then detected (70JCS(C)2230). 

Jaouen, F. et al.. Oxygen reduction catalysts for polymer electrolyte fuel cells from the pyrolysis of iron acetate adsorbed on various carbon supports, J. Phys. Chem. B, 107, 1376, 2003. 

A colorimetric method of estimating small quantities of uranium in solution depends upon the red colour obtained when a uranyl salt is treated with sodium salicylate. Free mineral acid, iron, acetic add, alcohol, or acetone must be absent, but neutral alkali salts do not interfere. 

Put on garden gloves (a must) and then tear off about a cubic inch (20 milliliters) of fine steel wool. This is about as much as you can tear off in one healthy pinch. Put the steel wool in the vinegar, and cover the cup with plastic wrap. Label the cup iron acetate and add your name and the date. The solution will be ready for use after sitting overnight. Save the solution with the steel wool still in it, as it will be used in a couple of demonstrations. 

With safety glasses securely in place, add a teaspoon (5 milliliters) of hydrogen peroxide to a quarter cup (60 milliliters) of iron acetate solution (see the Shopping List and Solutions ). The solution should turn a nice reddish brown as the ferrous ion becomes the ferric ion. Slowly add a half cup (120 milliliters) of cold, brewed brown tea. You should get a black, mushy precipitate that will eventually settle to the bottom. Historically, this material was used as black ink, and this precipitation reaction was used to produce it. 

Now, making certain your safety glasses are in place, take the iron acetate solution mentioned in the Shopping List and Solutions and put a puddle of it, about a half inch (about 1 centimeter) in diameter, on a dry ceramic or glass plate. Take care that the puddle does not smear. If the puddle clearly has a raised top, rounded by surface tension, then you are... 

Take some drops of household ammonia and make another puddle with the same rounded top, positioned about a quarter inch (about a half a centimeter) from the iron acetate puddle. Now carefully draw a line of liquid connecting the two puddles by dragging the end of a straw from one puddle to the other. The puddles should merge just at the point of contact. 

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