:Triphosphane

{{See also|Triphos (disambiguation){{!}}triphos}}

{{Use dmy dates|date=June 2023}}

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| ImageFileL1 = Triphosphine.svg

| ImageFileL1_Ref = {{chemboximage|correct|??}}

| ImageSizeL1 =

| ImageNameL1 = Structural formula of triphosphane

| ImageFileR1 = Triphosphane-3D-balls.png

| ImageSizeR1 =

| ImageNameR1 = Ball-and-stick model

| SystematicName = Triphosphane{{Cite web|title = triphosphane (CHEBI:35893)|url = https://www.ebi.ac.uk/chebi/searchId.do?chebiId=35893|work = Chemical Entities of Biological Interest (ChEBI)|publisher = European Bioinformatics Institute|accessdate = 27 September 2011|location = UK|date = 7 June 2006|at = Main}}

| OtherNames = Triphosphine{{Cite web|title = Triphosphine|url = http://webbook.nist.gov/cgi/cbook.cgi?ID=13597-70-1|work = NIST Chemistry WebBook|publisher = National Institute of Standards and Technology|accessdate = 27 September 2011|location = USA}}

|Section1={{Chembox Identifiers

| CASNo_Ref = {{cascite|correct|??}}

| CASNo = 13597-70-1

| PubChem = 139510

| ChemSpiderID = 123032

| ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}}

| ChEBI = 35893

| ChEBI_Ref = {{ebicite|changed|EBI}}

| SMILES = PPP

| StdInChI = 1S/H5P3/c1-3-2/h3H,1-2H2

| StdInChI_Ref = {{stdinchicite|changed|chemspider}}

| StdInChIKey = ITHPEWAHFNDNIO-UHFFFAOYSA-N

| StdInChIKey_Ref = {{stdinchicite|changed|chemspider}}

}}

|Section2={{Chembox Properties

| Formula = {{chem2|P3H5}}

| MolarMass = 97.96099 g·mol⁻¹

| Appearance = Colourless gas

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|Section9={{Chembox Related

| OtherAnions = triazane

| OtherCations =

| OtherFunction_label = Binary phosphanes

| OtherFunction = phosphane
diphosphane

| OtherCompounds = triazene

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Triphosphane (IUPAC systematic name) or triphosphine is an inorganic compound having the chemical formula {{chem2|HP(PH2)2}}. It can be generated from diphosphine but is highly unstable at room temperature:{{Greenwood&Earnshaw2nd}}

:{{chem2|2 P2H4 → P3H5 + PH3}}

Samples have been isolated by gas chromatography. The compound rapidly converts to {{chem2|PH3}} and the cyclophosphine cyclo-{{chem2|P5H5}}.{{cite journal | author = Marianne Baudler, Klaus Glinka | title = Monocyclic and Polycyclic Phosphines | journal = Chem. Rev. | year = 1993 | volume = 93 | pages = 1623–1667 | doi = 10.1021/cr00020a010}}