Polyoxymethylene dimethyl ethers

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| ImageFile = Polyoxymethylene dimethyl ether.svg

| ImageSize = 180px

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| Section1 = {{Chembox Identifiers

| CASNo1 = 13353-03-2

| CASNo2 = 13352-75-5

| CASNo3 = 13352-76-6

| CASNo4 = 13352-77-7

| CASNo5 = 13353-04-3

| CASNo5_Ref = {{Cascite|changed|CAS}}

| PubChem5 = 58099115

| SMILES1 = COCOCOCOC

| SMILES2 = COCOCOCOCOC

| SMILES3 = COCOCOCOCOCOC

| SMILES4 = COCOCOCOCOCOCOC

| SMILES5 = COCOCOCOCOCOCOCOC

| InChI1=1S/C5H12O4/c1-6-3-8-5-9-4-7-2/h3-5H2,1-2H3

| InChI2=1S/C6H14O5/c1-7-3-9-5-11-6-10-4-8-2/h3-6H2,1-2H3

| InChI3=1S/C7H16O6/c1-8-3-10-5-12-7-13-6-11-4-9-2/h3-7H2,1-2H3

| InChI4=1S/C8H18O7/c1-9-3-11-5-13-7-15-8-14-6-12-4-10-2/h3-8H2,1-2H3

| InChI5=1S/C9H20O8/c1-10-3-12-5-14-7-16-9-17-8-15-6-13-4-11-2/h3-9H2,1-2H3

| ChemSpiderID1 = 29577153

| ChemSpiderID2 = 29577150

| ChemSpiderID3 = 29577151

| ChemSpiderID4 = 26540223

| ChemSpiderID5 = 29577154

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| Section2 = {{Chembox Properties

| Formula = H₃CO(CH₂O)_nCH₃

| MolarMass = Variable

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Polyoxymethylene dimethyl ethers (PODE or DMMn) are a class of chemical compounds with the molecular formula H₃CO(CH₂O)_nCH₃ where n is typically about 3 to 8.

PODE can be produced from methylal and formaldehyde or a formaldehyde equivalent such as paraformaldehyde{{cite journal| doi=10.1016/0304-5102(87)80118-9 | volume=41 | issue=3 | title=Lithium halide-assisted formation of polyoxymethylene dimethyl ethers from dimethoxymethane and formaldehyde | year=1987 | journal=Journal of Molecular Catalysis | pages=391–393 | author=Arvidson M., Fakley M.E., Spencer M.S.}} or trioxane.{{cite journal | journal = Journal of Fuel Chemistry and Technology | volume = 39 | issue = 12 | date = 2011 | pages = 918–923 | title = Synthesis of polyoxymethylene dimethyl ethers from methanol and trioxymethylene with molecular sieves as catalysts |author1=Qi Zhao |author2=Hui Wang |author3=Zhang-feng Qin |author4=Zhi-wei Wu |author5=Jian-bing Wu |author6=Wei-bin Fan |author7=Jian-guo Wang | doi = 10.1016/S1872-5813(12)60003-6}}

PODE is used as a diesel fuel additive{{Cite book| author = Pellegrini, L., Marchionna, M., Patrini, R., and Florio, S. | title = SAE Technical Paper Series | volume = 1 | work = SAE Technical Paper 2013-01-1035 | date = 2013 | doi =10.4271/2013-01-1035| chapter = Emission Performance of Neat and Blended Polyoxymethylene Dimethyl Ethers in an Old Light-Duty Diesel Car }} and as a solvent.