Isobutyryl chloride

Isobutyryl chloride
Names
	Preferred IUPAC name 2-Methylpropanoyl chloride
	Other names Isobutyroyl chloride
Identifiers
CAS Number	79-30-1;
3D model ( JSmol)	Interactive image;
ChemSpider	56120;
ECHA InfoCard	100.001.086
PubChem CID	62325;
UNII	6617F0VJZC;
CompTox Dashboard (EPA)	DTXSID0052542 ;
	InChI InChI=1S/C4H7ClO/c1-3(2)4(5)6/h3H,1-2H3 Key: DGMOBVGABMBZSB-UHFFFAOYSA-N;
	SMILES CC(C)C(=O)Cl;
Properties
Chemical formula	C4H7ClO
Molar mass	106.55 g·mol−1
Density	1.017 g/mL
Melting point	−90 °C
Boiling point	91–93 °C (196–199 °F; 364–366 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Isobutyryl chloride (2-methylpropanoyl chloride) is the organic compound with the formula (CH₃)₂CHCOCl. A colorless liquid, it the simplest branched-chain acyl chloride. It is prepared by chlorination of isobutyric acid.^[2]

Reactions

As an ordinary acid chloride, isobutyryl chloride is the subject of many reported transformations. Dehydrohalogenation of isobutyryl chloride with triethylamine gives

2,2,4,4-tetramethylcyclobutanedione.^[3] Treatment of isobutyryl chloride with hydrogen fluoride gives the acid fluoride.^[4]