Ferrous Oxalate

Chemical Designations - Synonyms Ferrous oxalate dihydrate, Ferrox, Iron protoxalate. Oxalic acid (ferrous salt) Chemical Eormula FeC204 2H20. 

Similarly, cyclization of 2-o-nitrophenylpyridine A-oxide gave 211, deoxygenation preceding cyclization, though in this case a trace of 8-carboline was isolated. The cyclization of 4-o-nitrophenylpyridine (219) to jS-carbohne by heating with ferrous oxalate presents no such difficulties and is easily achieved, although 219 is not very readily available. By analogy, it should be possible to obtain a mixture of a- and y-carbohne from 3-o-nitrophenylpyridine (220 R = NO2). 

The original method of polymers stabilization was invented by Gladyshev and coworkers [14-18]. They proposed to introduce in polymer a metal compound inert toward dioxygen. This compound is decomposed at elevated temperatures with production of a thin metal powder. Formates, oxalates, and carbonyls of metals were suggested as predecessors of an active metal powder. For example, ferrous oxalate decomposes at 600-630 K with the formation of pyrofore iron and ferrous oxide... 

The products are isolated in good yield in a one-stage synthesis from starting materials that are readily available in the main. An alternative method involves the decomposition of the corresponding azides.9,12 These compounds are less readily available and are more hazardous to use than are the nitro compounds used in the present synthesis. This synthesis also gives better yields than the cyclization using ferrous oxalate, 2,13 which is performed under much harsher conditions. 

Ferric Oxide or Red Iron Trioxide (Hematite), FejjOj, mw 159.70, ted or blk trigonal crysts, sp gr 5.12, mp 1560°(dec) insol in w, sol in HCl other acids found in nature as hematite and is a by-product in some industries. Can be prepd by dehydrating ferric hydroxide or calcining ferrous oxalate or sulfate. Used in magnetic tapes in electronics and as an ingredient of some expl compns Refs l) Lange (1961), No 824 2) Cond-... 

Ferrous Oxide (Iron Monoxide), FeO mw 71.85, blk pdr, sp gt 5-7, mp 1420° insol in w, sol in acids. Can be prepd by heating ferrous oxalate under the hood, while avoiding inhalation of toxic CO evolved. Some ferric oxide is present as impurity. Used as ingredient of some expls... 

Dihydrazino-ferrous Chlori4.e.JEe (NallJ 2]C12, and dihydrazino-ferrous oxalate, [Fe(N2H4)]C204, have also been prepared. They are pale yellow solids.6 - - > . ... 

Compound Name Ferrous Fluoroborate Ferrous Chloride Ferrous Chloride Ferrous Fluoroborate Ferrous Oxalate Ferrous Oxalate Ferrous Sulfate Ferrous Oxalate Sulfuric Acid Sodium Nitrite Oil = Fish... 

Glyoxal, 40 % Solution Glyoxal, 40 % Solution Oxalic Acid Ammonium Oxalate Cyanogen Ferrous Oxalate Cyanogen... 

Additional Exercises Lead chromate, PbC rO, calcium phosphate, Ca3(PC>4)2 ferrous oxalate, Fe(C2C>4) sodium chloride, NaCl, precipitated from a saturated solution by HC1 gas, Richards and Wells, Revision of the atomic weights of sodium and chlorine, J. Am. Chem. Soc., 27, 459 (1905). 

Fifteen grams of Mohr s salt (ferrous ammonium sulfate 6-hydrate) are dissolved In 50ml of water containing one ml of ZM sulfuric acid. The solution is stirred well while it is mixed with 7.5g of oxalic acid 2-hydrate in 75ml of water. The mixture, which now contains a yellow precipitate of ferrous oxalate, is carefully [CAUTION bumping ] heated to the boiling point, allowed to settle, and cooled somewhat The supernatant liquid is decanted and the solid washed once by decantation with about 50ml of hot water. 

The yield is over 95% based on 6.5g of ferrous oxalate monohydrate starting material ... 

Both the dry complex oxalate and its aqueous solution are unstable to direct light and deposit yellow ferrous oxalate. This property was formerly utilized in platinotypes—a photographic process by which the FeCaO produced by illumination reduces a platinic salt to a black platinum image. The oxalate is a mixture, which has been resolved into its mirror images. 

Stability of Illuminated n-GaP in Redox Solutions. Figure 10 shows the current-potential curves for the n-GaP electrode under illumination, in the presence of ferrous oxalate Fe(020 )2 " and ferrocyanide Fe(CN)g -, together with that for the solution without... 

Figure 10. Current-potential curves for the (lll)-face of n-GaP under illumination at pH 6.0 in the presence of 0.05M ferrous oxalate (a) and 0.05M ferrocya-nide (b), together with that of a solution containing only 0.05M Na2SOt as a supporting electrolyte...

All these results can be explained in terms of the model proposed above (cf. Fig. 11). Namely, with ferrous oxalate having a standard redox potential E° (Ox/R) of —0.2 V (SCE), which is a little more negative than the E of the surface trapped hole located ca. 0.5 V above E , the surface trapped hole is effectively quenched by the rapid reduction, and the photoanodic current flows without decomposition. With ferrocyanide, having an E(0x/R) of 0.2 V (SCE), which is more positive than the E of the surface trapped hole, the surface trapped holes are accumulated to the extent that the surface potential created will level it down to the E(0x/R) of the redox couple. At this point, the rates of nu-cleophillic attack of H2O and OH to the surface trapped holes are still low and the electrode decomposition is prevented. 

Examples of the variation of process a from the refs include 1) semipyrophoric FeO is obtd by heating ferrous oxalate to 390—410° for 10—11 mins in a tube in which air has been replaced by N2 and then cooling 2) semipyro-phone FeO can also be produced by reducing ferrous oxalate in a stream of H2 at 400° for 1 hr See also Pyrophoric Incendiary Agents in Vol 8, P502-L to P504-R Refs 1)0. Wyss, Semipyrophoric Metals , GerP 595069 (1934) CA 29, 1252 (1935)... 

Uses Hardening and acid fixing baths stop baths as a clearing bath after ferrous oxalate development of bromide paper. Glacial acetic acid can be used as a solvent of gelatin, celluloid, and pyroxylin. 

The ferrous oxalate procedure has been employed successfully to prepare 8,10-dimethyl-3,4-benzophenanthridine from 2-mesityl-l-nitronaphthalene.85 However, an attempted preparation of 4,9-diazachrysene from 2,2 -dimethyl-6,6/-dinitrobiphenyl failed, while treatment with an excess of triethyl phosphite gave 1,10-dimethyl -benzo[c]cinnoline (11%) as the only recognizable product. Failure... 

An unusual synthesis reported recently13 is the reaction of 3-acetamido-2-nitrobenzothiophene (17) with ferrous oxalate. The major products are 3-cyano-l,2-benzisothiazole (18) and the corresponding amide (19). Once again the mechanism of this curious... 

You can tell from the equation that the big change was in the placement of the iron (Fe) atoms. In the ferric oxalate, there were two iron atoms in each molecule. However, in the new compound, called ferrous oxalate, there was only one iron atom in each molecule. 

When you put the exposed blueprint papers into the developing solution, there was a reaction between the ferrous oxalate and the potassium ferricyanide. This reaction caused the blue color to appear. 

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