Methoxymethylenetriphenylphosphorane

Methoxymethylenetriphenylphosphorane
Names
	IUPAC name Methoxymethylidene(triphenyl)-λ5-phosphane
Identifiers
CAS Number	20763-19-3 ;
3D model (JSmol)	Interactive image;
ChemSpider	9923480;
PubChem CID	11748776;
CompTox Dashboard (EPA)	DTXSID901282268 ;
	InChI InChI=1S/C20H19OP/c1-21-17-22(18-11-5-2-6-12-18,19-13-7-3-8-14-19)20-15-9-4-10-16-20/h2-17H,1H3 Key: DYROHZMICXBUMX-UHFFFAOYSA-N;
	SMILES COC=P(C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3;
Properties
Chemical formula	C20H19OP
Molar mass	306.345 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Methoxymethylenetriphenylphosphorane is a Wittig reagent used for the homologization of aldehydes, and ketones to extended aldehydes, an organic reaction first reported in 1958. The reagent is generally prepared and used in situ. It has blood-red color, indicative of destabilized ylides.