6487-48-5

Usage

Uses

Used in Pharmaceutical Industry:
Potassium oxalate monohydrate is used as a chelating agent and purifying agent for various pharmaceutical applications.
Used in Rare-Earth Metal Processing:
Potassium oxalate monohydrate is used as a precipitating agent in the processing of rare-earth metals.
Used in Textile and Wood Industry:
Potassium oxalate monohydrate is used as a grinding agent, rust remover, and bleaching agent in the textile and wood industries.
Used in Automobile Industry:
Potassium oxalate monohydrate is used as a scale remover in automobile radiators.
Used in Water Treatment:
Potassium oxalate monohydrate is used in water treatment processes.
Used in Analytic Chemistry:
Potassium oxalate monohydrate is used to determine the calcium content and other heavy metals and reducing agents in analytic chemistry.
Used in Catalyst Preparation:
Potassium oxalate monohydrate is used in the preparation of SBA-15 (Santa Barbara Amoprhous-15) supported catalyst.

References

https://www.alfa.com/en/catalog/A12289/ https://pubchem.ncbi.nlm.nih.gov/compound/Potassium_oxalate#section=Top

Purification Methods

Recrystallise it from hot water. It forms various K + oxalic acid salts [e.g. potassium hydrogen oxalate KH(C2O4)—see above, and KH3(C2O4)2 which is, surprisingly, called potassium tetraoxalate—see below]. [Beilstein 2 H 513, 2 I 224, 2 II, 485, 2 III 1552, 2 IV 1823.]

InChI:InChI=1/C2H2O4.2K/c3-1(4)2(5)6;;/h(H,3,4)(H,5,6);;/q;2*+1/p-2

Synthetic route

methylammonium carbonate (15719-64-9, 15719-76-3, 97762-63-5) → potassium oxalate monohydrate (6487-48-5)

Conditions	Yield
With amalgamated potassium at 360℃;

methylammonium carbonate (15719-64-9, 15719-76-3, 97762-63-5) → potassium oxalate monohydrate (6487-48-5) + alkali formate/s

Conditions	Yield
With potassium hydride at 80℃;

oxalic acid (144-62-7) + potassium carbonate (584-08-7) → potassium oxalate monohydrate (6487-48-5)

Conditions	Yield
In not given neutralisation;
In not given neutralisation;

potassium hydrogenoxalate (127-95-7, 127-96-8, 583-52-8, 10043-22-8, 20700-38-3) + potassium carbonate (584-08-7) → potassium oxalate monohydrate (6487-48-5)

Conditions	Yield
In not given neutralisation;
In not given neutralisation;

oxalic acid (144-62-7) + potassium hydroxide → potassium oxalate monohydrate (6487-48-5)

Conditions	Yield
In not given neutralisation;
In not given neutralisation;

potassium hydrogenoxalate (127-95-7, 127-96-8, 583-52-8, 10043-22-8, 20700-38-3) + potassium hydroxide → potassium oxalate monohydrate (6487-48-5)

Conditions	Yield
In not given neutralisation;
In not given neutralisation;

water (7732-18-5) + potassium oxalate monoperhydrate → dihydrogen peroxide (7722-84-1) + potassium oxalate monohydrate (6487-48-5)

Conditions	Yield
In neat (no solvent) Kinetics; 20°C, varying partial pressure of water and H2O2;

+ potassium oxalate monohydrate (6487-48-5) → [Cu(2-(2-pyridyl)imidazole)(oxalate)(H2O)]*2H2O

[2-(2-pyridyl)imidazole]copper(II) nitrate + potassium oxalate monohydrate (6487-48-5) → [Cu(2-(2-pyridyl)imidazole)(oxalate)(H2O)]*2H2O

Conditions	Yield
In water prepn. by slow diffusion in H-shaped tube of aq. solns. contg. K2C2O4*H2O in one arm and (2-(2-pyridyl)imidazole)copper(II) nitrate in the other; diffusion is complete in one mo; elem. anal.;	99%

copper(ll) sulfate pentahydrate + potassium oxalate monohydrate (6487-48-5) → dipotassium bisoxalato copper(II) dihydrate

Conditions	Yield
In water heating 0.05 mol soln. of sulfate in water at 90°C; addn. of 0.2 mol oxalate soln.; filtration at 10°C;; ppt. washed with water and at 50°C about 12 h dried;;	97%
In water heating 0.05 mol soln. of sulfate in water at 90°C; addn. of 0.2 mol oxalate soln.; filtration at 10°C;; ppt. washed with water and at 50°C about 12 h dried;;	97%

[ruthenium(II)(η6-1-methyl-4-isopropyl-benzene)(chloride)(μ-chloride)]2 (52462-29-0) + potassium oxalate monohydrate (6487-48-5) → [(p-cymene)2Ru2(μ-η4-C2O4)]Cl2 (201336-17-6, 1185317-98-9, 201425-24-3)

Conditions	Yield
In methanol; chloroform at 20℃; for 18h; Reflux;	96%

[2,2]bipyridinyl (366-18-7) + copper(II) nitrate trihydrate + potassium oxalate monohydrate (6487-48-5) → [(copper(II)(nitrate)(2,2'-bipyridine)(H2O))2(μ-oxalate)] (226998-72-7, 94069-86-0)

Conditions	Yield
In water stirring (60°C, 1 h); filtn., recrystallization (water); elem. anal.;	95%

copper(II) nitrate trihydrate + potassium oxalate monohydrate (6487-48-5) → 2C2O4(2-)*2K(1+)*Cu(2+)*4H2O

Conditions	Yield
In water at 20 - 90℃; for 24h;	95%

2,2'-biimidazole (492-98-8) + copper(II) nitrate trihydrate + potassium oxalate monohydrate (6487-48-5) → [Cu(2,2'-biimidazole)(oxalate)(H2O)]*H2O (670227-93-7)

Conditions	Yield
In water prepn. by slow diffusion in H-shaped tube of aq. solns. contg. K2C2O4*H2O in one arm and a mixt. of Cu(NO3)2*3H2O and 2,2'-biimidazole in the other; elem. anal.;	90%

4-amino-1,2,4-triazole (584-13-4) + potassium oxalate monohydrate (6487-48-5) + nickel(II) oxalate dihydrate (20161-19-7, 34729-05-0) → [Ni(μ-ox)(4-amino-1,2,4-triazole)2]n

Conditions	Yield
In water soln. (10 ml) of (C2H2N3)NH2 (2.00 mmol) added dropwise to soln. (10 ml)of Ni(C2O4)*2H2O (0.44 mmol) and K2C2O4*H2O (2.4 mmol); elem. anal.;	90%

4-amino-1,2,4-triazole (584-13-4) + potassium oxalate monohydrate (6487-48-5) + cobalt(II) oxalate dihydrate (14646-43-6, 62782-24-5) → [Co(μ-ox)(4-amino-1,2,4-triazole)2]n

Conditions	Yield
In water soln. (10 ml) of (C2H2N3)NH2 (2.00 mmol) added dropwise to soln. (10 ml)of Co(C2O4)*2H2O (0.44 mmol) and K2C2O4*H2O (4.00 mmol); elem. anal.;	90%

[zinc(3,14-dimethyl-2,6,13,17-tetraazatricyclo(16.4.0.07,12)docosane)(nitrate)2] + potassium oxalate monohydrate (6487-48-5) → ([Zn(5,16-dimethyl-2,6,13,17-tetraazatricyclo[16.4.0(1,18).0(7,12)]docosane)(oxalate)2]*3.5H2O)n

Conditions	Yield
In water; N,N-dimethyl-formamide aq. soln. of K salt added to soln. of Zn compd. in DMF; evapd. slowly; elem. anal.;	90%

(3,14-dimethyl-2,6,13,17-tetraazatricyclo[14,4,0(1.18),0(7.12)]docosane)zinc(II) nitrate + water (7732-18-5) + potassium oxalate monohydrate (6487-48-5) + N,N-dimethyl-formamide (68-12-2, 33513-42-7) → (3,14-dimethyl-2,6,13,17-tetraazatricyclo[14,4,0(1.18),0(7.12)]docosane)copper(II)(μoxalate)zinc(II) trihydrate semidimethylsulfoxide

Conditions	Yield
In water; N,N-dimethyl-formamide aq. soln. of K2C2O4*H2O added to a DMF soln. of Zn complex (1 equiv.); crystd., elem. anal.;	90%

(3,14-dimethyl-2,6,13,17-tetraazatricyclo[14,4,0(1.18),0(7.12)]docosane)copper(II)di(perchlorate) + water (7732-18-5) + potassium oxalate monohydrate (6487-48-5) → (3,14-dimethyl-2,6,13,17-tetraazatricyclo[14,4,0(1.18),0(7.12)]docosane)copper(II)(μoxalate)copper(II) pentahydrate

Conditions	Yield
In water; N,N-dimethyl-formamide DMF soln. of Cu complex treated with 1 equiv. of K2C2O4*H2O in H2O; crystd. (air) at ambient temp. for 1 week, elem. anal.;	90%

sodium tetrachloropalladate(II) + tris(bipyridine)ruthenium(II) dichloride hexahydrate + potassium oxalate monohydrate (6487-48-5) → [tris(2,2'-bipyridine)ruthenium(II)][Pd2(oxalate)3]

Conditions	Yield
In water byproducts: NaCl, KCl; an aq. soln. of Na2PdCl4 was added dropwise to an aq. soln. of Ru-complex and K2C2O4*H2O, 60 min; ppt. was filtered off, washed with water, air-dried; elem. anal.;	89.8%

C34H49Cl4Ir3N4 + silver trifluoromethanesulfonate (2923-28-6) + potassium oxalate monohydrate (6487-48-5) → C72H98Ir6N8O8(4+)*4CF3O3S(1-)

Conditions	Yield
Stage #1: C34H49Cl4Ir3N4; silver trifluoromethanesulfonate In methanol at 20℃; for 3h; Darkness; Stage #2: potassium oxalate monohydrate In methanol for 8h;	88%

cis-dichlorobis(triethylphosphine)platinum(II) (13965-02-1, 14177-93-6, 15692-07-6) + potassium oxalate monohydrate (6487-48-5) → bis(triethylphosphine)(oxalato)platinum(II) (81457-59-2)

Conditions	Yield
In methanol; water Pt complex and potassium oxalate mixing in equal volumes of hot MeOH and water, concg., cooling, off-white crystals sepg.; purified by recrystn. from CH2Cl2/Et2O; identified by elem. anal., NMR, IR and UV spectra;	85%

piperazine (110-85-0) + potassium oxalate monohydrate (6487-48-5) + copper(l) chloride → (piperazine)copper(II) oxalate (753457-07-7)

Conditions	Yield
With air In water byproducts: K2Cu(oxalate)2*2H2O; Cu:ox:piperazine=1.10:10.86:11.61 reacted for 6 d; ppt. filtered; elem. anal.;	85%

pyrazine-2,3-diamine (13134-31-1) + bis[dichloro(pentamethylcyclopentadienyl)iridium(III)] (12354-84-6, 12354-85-7) + potassium oxalate monohydrate (6487-48-5) → C34H49Cl4Ir3N4

Conditions	Yield
In methanol at 20℃; for 3h;	85%

cis-dichlorobis(triethylphosphine)platinum(II) (13965-02-1, 14177-93-6, 15692-07-6) + potassium oxalate monohydrate (6487-48-5) → bis(triethylphosphine)(oxalato)platinum(II) (81457-59-2)

Conditions	Yield
In methanol; water byproducts: KCl; heated with stirring until all solids dissolved, further heated for 10 min; concd., cooled (several h), collected, washed (2xH2O), dried under vacuum for 12 h, recrystd. (CH2Cl2), filtered, Et2O added, several h at 25°C, crystd., cooled to -10°C for 16 h, collected, washed (Et2O), dried in vacuo (1 h), elem. anal.;	84%

sodium tetrachloropalladate(II) + manganese(II) chloride tetrahydrate + tris(bipyridine)ruthenium(II) dichloride hexahydrate + potassium oxalate monohydrate (6487-48-5) → [tris(2,2'-bipyridine)ruthenium(II)][PdMn(oxalate)3]

Conditions	Yield
In water byproducts: NaCl, KCl; an aq. soln. of Na2PdCl4 and MnCl2*4H2O was added dropwise to an aq. soln. of Ru-complex and K2C2O4*H2O, 60 min; ppt. was filtered off, washed with water, air-dried; elem. anal.;	83.4%

osmium(VIII) oxide (20816-12-0) + 1,10-Phenanthroline (66-71-7) + hydroxylamine hydrochloride (5470-11-1) + potassium oxalate monohydrate (6487-48-5) → 1,10-phenanthrolinedium pentabromonitrosylosmate

Conditions	Yield
With HBr In water stirring at 70-80°C for 1 h, then cooling to 10°C, adjustment of pH to ca 4.5, then addn. of concd. HBr, boiling for 1.5 h, cooling to room temp., then addn. of a hot (70°C) aq. soln. of C12H8N2, stirring for 45 min at 25°C; filtration, drying in vac., washing with benzene, drying under P4O10 in vac. for 24 h, elem. anal.;	83%

Adipic acid (124-04-9) + potassium oxalate monohydrate (6487-48-5) + oxalic acid (144-62-7) + zinc(II) oxide → K2(H2adp)[Zn2(ox)3]*3H2O

Conditions	Yield
With polytetrafluoroethylene In water at 20 - 130℃; for 202h; Autoclave;	83%

manganese(II) chloride tetrahydrate + [ΛRu(2,2'-bipyridine)3]I2*6H2O + potassium oxalate monohydrate (6487-48-5) → ([Ru(II)Λ(bpy)3][Mn(II)Λ2(oxalate)3])n

Conditions	Yield
With LiCl In water addn. of MnCl2 to mixt. of Ru-complex and LiCl (stirring), addn. of K2C2O4 (pptn. after few min); collection (filtration), washing (water, EtOH), drying in air; elem. anal.;	81%

4-aminopyridine (504-24-5) + potassium oxalate monohydrate (6487-48-5) + cobalt(II) oxalate dihydrate (14646-43-6, 62782-24-5) → (Co(μ-oxalate)(4-aminopyridine)2)

Conditions	Yield
In methanol; water react. MeOH soln. 4-ampy with aq. soln. Co(ox)*2H2O and K2(ox)*H2O; elem. anal.;	80%

potassium oxalate monohydrate (6487-48-5) + tin(IV) chloride (7646-78-8) → potassium-μ-oxalato-di[trisoxalatostannate(IV)] tetrahydrate

Conditions	Yield
In water addn. of SnCl4 to 3.5-4 equiv. of K2C2O4 soln., heating to 70°C; EtOH addn., crystn. (cooling), filtration (ice-cold EtOH, ice-cold Et2O), recrystn. (aq. EtOH), drying (70°C); elem. anal.;	80%

4-amino-1,2,4-triazole (584-13-4) + potassium oxalate monohydrate (6487-48-5) + potassium bis(oxalato)cuprate(II) dihydrate → [Cu(μ-ox)(4-amino-1,2,4-triazole)2]n

Conditions	Yield
In methanol; water MeOH soln. of (C2H2N3)NH2 (2.5 mmol) layered onto aq. soln. of K2Cu(C2O4)2*2H2O (0.5 mmol) and K2C2O4*H2O (0.33 mmol); kept (2 wk); washed with cold H2O and Et2O; dried in air; elem. anal.;	80%

manganese (II) nitrate tetrahydrate + potassium oxalate monohydrate (6487-48-5) + trans-1,2-bis(4-pyridyl)ethylene (1135-32-6) → [Mn2(μ-oxalato)2(μ-1,2-bis(4-pyridyl)ethylene)(1,2-bis(4-pyridyl)ethylene)2]

Conditions	Yield
In methanol; water aq. soln. of K oxalate added to MeOH-H2O soln. of NC5H4CHCHC5H4N and Mn salt (molar ratio 1:1:3); ppt. collected; elem. anal.;	80%

[Pd(C,N-κ2-C6H4CH=NC6H3-2,6-i-Pr2)(μ-Cl)]2 (710294-09-0) + potassium oxalate monohydrate (6487-48-5) → C40H44N2O4Pd2 (1607816-89-6)

Conditions	Yield
Stage #1: [Pd(C,N-κ2-C6H4CH=NC6H3-2,6-i-Pr2)(μ-Cl)]2 With silver nitrate In acetonitrile at 20℃; for 15h; Darkness; Stage #2: potassium oxalate monohydrate In dichloromethane; water at 20℃; for 16h; Schlenk technique;	80%

[(C6F5)2Pt(μ-PPh2)2Pt(CH3CN)2] (881073-95-6) + tetrabutylammonium perchlorate (1923-70-2) + potassium oxalate monohydrate (6487-48-5) → [NBu4]2[{(C6F5)2Pt(μ-PPh2)2Pt}2(μ-C2O4-κ2O,O′:κ2O″,O‴)]

Conditions	Yield
In acetone at 20℃; for 20h;	77%

zirconyl chloride octahydrate + oxalic acid dihydrate (6153-56-6) + potassium oxalate monohydrate (6487-48-5) + potassium hydroxide → K6[(Zr(C2O4)3)2(μ-C2O4)] * 4 H2O

Conditions	Yield
In water molar ratio Zr:oxalic acid:K2C2O4=1:3:1, pH-adjustment to 1.5 (0.1 M KOH), stirring at 80°C for 12 h; filtration, crystn. (closed vessel, room temp., 2 months), collection (filtration), washing (cold water), drying (vac., 6 h); elem. anal.;	75%

copper(II) nitrate trihydrate + 2,3-bis(2-pyridyl)quinoxaline (23309-74-2) + water (7732-18-5) + potassium oxalate monohydrate (6487-48-5) → [copper(II) bis(2-pyridyl)quinoxaline (oxalate)(aqua)] pentahydrate

Conditions	Yield
In ethanol; water ligand added to Cu salt in H2O/EtOH 80:20 v/v, gently refluxed for 15 min, treated with K2Ox*H2O while stirring; evapd. at room temp., elem. anal.;	75%

Upstream product

• 7732-18-5 water 
• 127-95-7 potassium hydrogenoxalate 
• 144-62-7 oxalic acid 
• 584-08-7 potassium carbonate 
• 15719-64-9 methylammonium carbonate 

Downstream Products

• 584-08-7 potassium carbonate 
• 7440-02-0 nickel 
• 7439-92-1 lead 
• 7440-48-4 cobalt 
• 583-52-8 potassium oxalate 
• 75-07-0 acetaldehyde 
• 325139-43-3 cis-ammine(4-amino-2,2,6,6-tetramethylpiperidin-1-oxyl)oxalatoplatinum (II)