fluoran

{{short description|Chemical compound}}

{{chembox

| verifiedrevid = 443823726

| ImageFile=Fluoran.png

| ImageSize=200px

| PIN=3H-Spiro[[2]benzofuran-1,9′-xanthen]-3-one

| OtherNames=

|Section1={{Chembox Identifiers

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChemSpiderID = 62216

| InChI = 1/C20H12O3/c21-19-13-7-1-2-8-14(13)20(23-19)15-9-3-5-11-17(15)22-18-12-6-4-10-16(18)20/h1-12H

| InChIKey = FWQHNLCNFPYBCA-UHFFFAOYAD

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

| StdInChI = 1S/C20H12O3/c21-19-13-7-1-2-8-14(13)20(23-19)15-9-3-5-11-17(15)22-18-12-6-4-10-16(18)20/h1-12H

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

| StdInChIKey = FWQHNLCNFPYBCA-UHFFFAOYSA-N

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

| CASNo=596-24-7

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = C8A6LHH76W

| PubChem=68994

| ChEBI_Ref = {{ebicite|correct|EBI}}

| ChEBI = 37915

| SMILES = O=C2OC4(c1ccccc12)c5ccccc5Oc3ccccc34

}}

|Section2={{Chembox Properties

| Formula=C₂₀H₁₂O₃

| MolarMass=300.31

| Appearance=

| Density=

| MeltingPt=

| BoilingPt=

| Solubility=

}}

|Section3={{Chembox Hazards

| MainHazards=

| FlashPt=

| AutoignitionPt =

}}

}}

Fluoran is a triarylmethane dye. It is the structural core of a variety of other dyes.Hatano, Y. "The chemistry of fluoran leuco dyes" in Chemistry and Applications of Leuco Dyes, Ed. R. Muthyala, Plenum Press 1997

These dyes have a variety of applications such as chemical stains (for example eosins) and in thermal paper. Black 305 is a common leuco dye product for thermal paper.{{cite web |title=BLACK 305 |url=https://nagaseamerica.com/product/black-305/ |website=Nagase America |publisher=Nagase America Corporation |accessdate=24 August 2019}}

File:Eosin.svg, a fluoran-based dye]]{{clear-left}}