:9-Methylene-fluorene

{{Chembox

| ImageFile = 9-Methylene-fluorene.png

| ImageSize =

| PIN = 9-Methylidene-9H-fluorene

| OtherNames = Methylenefluorene
9-Methylidenefluorene
Dibenzofulvene

| Section1 = {{Chembox Identifiers

| CASNo = 4425-82-5

| CASNo_Ref = {{cascite|correct|CAS}}

| PubChem = 78147

| ChemSpiderID = 70523

| SMILES = C=C1C2=CC=CC=C2C3=CC=CC=C13

| InChI= 1S/C14H10/c1-10-11-6-2-4-8-13(11)14-9-5-3-7-12(10)14/h2-9H,1H2

| InChIKey = ZYASLTYCYTYKFC-UHFFFAOYSA-N

| UNII = 9299E1P3CC

}}

| Section2 = {{Chembox Properties

| C=14|H=10

| Appearance =

| Density =

| MeltingPt =

| BoilingPt =

| Solubility =

}}

| Section3 = {{Chembox Hazards

| MainHazards =

| FlashPt =

| AutoignitionPt =

}}

}}

9-Methylene-fluorene or dibenzofulvene (DBF) is a polycyclic aromatic hydrocarbon with chemical formula {{chem2|(C6H4)2C\dCH2}}. It is best known as one product from deprotection of the Fmoc group.{{cite journal |doi=10.1021/jo00795a005 |title=9-Fluorenylmethoxycarbonyl amino-protecting group |date=1972 |last1=Carpino |first1=Louis A. |last2=Han |first2=Grace Y. |journal=The Journal of Organic Chemistry |volume=37 |issue=22 |pages=3404–3409 }} It can be prepared by treatment of 9-hydroxymethylfluorene with strong base.{{cite journal |doi=10.1021/ma025792r |title=Solid-State Polymerization of Dibenzofulvene Leading to a Copolymer with Oxygen |date=2003 |last1=Nakano |first1=Tamaki |last2=Nakagawa |first2=Osamu |last3=Yade |first3=Tohru |last4=Okamoto |first4=Yoshio |journal=Macromolecules |volume=36 |issue=5 |pages=1433–1435 |bibcode=2003MaMol..36.1433N }}