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Ethylidene diacetate
Names
	Preferred IUPAC name Ethane-1,1-diyl diacetate
	Other names 1,1-Diacetoxyethane; 1,1-Ethanediol diacetate
Identifiers
CAS Number	542-10-9 ;
3D model (JSmol)	Interactive image;
ChemSpider	21106538;
ECHA InfoCard	100.008.001
PubChem CID	222536;
UNII	KL1S8V6W25 ;
CompTox Dashboard (EPA)	DTXSID1027188 ;
	InChI InChI=1S/C6H10O4/c1-4(7)9-6(3)10-5(2)8/h6H,1-3H3 Key: ACKALUBLCWJVNB-UHFFFAOYSA-N; InChI=1/C6H10O4/c1-4(7)9-6(3)10-5(2)8/h6H,1-3H3 Key: ACKALUBLCWJVNB-UHFFFAOYAU;
	SMILES CC(OC(=O)C)OC(=O)C;
Properties
Chemical formula	C6H10O4
Molar mass	146.14
Appearance	Colorless liquid
Density	1.07 g/cm3
Melting point	18.9 °C (66.0 °F; 292.0 K)
Boiling point	167–169 °C (333–336 °F; 440–442 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Ethylidene diacetate is an organic compound with the formula (CH₃CO₂)₂CHCH₃. A colorless low-melting solid, it once served as a precursor to vinyl acetate.

Preparation

A major industrial route involves the reaction of acetaldehyde and acetic anhydride in the presence of a ferric chloride catalyst:^[1]^[2]

CH₃CHO + (CH₃CO)₂O → (CH₃CO₂)₂CHCH₃

It can be converted to the valuable monomer vinyl acetate by thermal elimination of acetic acid:

(CH₃CO₂)₂CHCH₃ → CH₃CO₂CH=CH₂ + CH₃CO₂H

References

^ G. Roscher "Vinyl Esters" in Ullmann's Encyclopedia of Chemical Technology, 2007 John Wiley & Sons: New York. doi:10.1002/14356007.a27_419
^ GB Patent 238825A 'Process of Manufacture of Acetic Anhydride and Aldehyde'