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Isobutyl formate (2-methylpropyl methanoate) is an organic ester with the chemical formula C5H10O2. It is formed by diluting isobutanol with formic acid; sulfuric acid can serve as a catalyst. It is used as a flavor and fragrance ingredient because of its odor which is sweet, ethereal, and slightly fruity.[2][3]

Isobutyl formate[1]
Isobutyl formate.svg
Ball and stick model of isobutyl formate
Preferred IUPAC name
2-Methylpropyl formate
Other names
Isobutyl formate
3D model (JSmol)
ECHA InfoCard 100.008.017
Molar mass 102.133 g·mol−1
Density 0.885 g/mL
Melting point −96 °C (−141 °F; 177 K)
Boiling point 98.4 °C (209.1 °F; 371.5 K)
R-phrases (outdated) R11 R34
S-phrases (outdated) S16 S26 S33 S36/37/39 S45
Flash point 10 °C (50 °F; 283 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references


  1. ^ Isobutyl formate at Sigma-Aldrich
  2. ^ Isobutyl formate, The Good Scents Company
  3. ^ Mosciano, Gerard (1989). Perfumer & Flavorist. 14 (6): 47. Missing or empty |title= (help)