2-methylbutyric acid methyl ester
Structural formula | |||||||||||||||||||
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Structural formula without stereochemistry | |||||||||||||||||||
General | |||||||||||||||||||
Surname | 2-methylbutyric acid methyl ester | ||||||||||||||||||
other names |
Methyl 2-methylbutyrate |
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Molecular formula | C 6 H 12 O 2 | ||||||||||||||||||
Brief description |
colorless liquid with a fruity odor |
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External identifiers / databases | |||||||||||||||||||
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properties | |||||||||||||||||||
Molar mass | 116.16 g mol −1 | ||||||||||||||||||
Physical state |
liquid |
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density |
0.885 g cm −3 |
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boiling point |
115 ° C |
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Vapor pressure |
20 hPa (20 ° C) |
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solubility |
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Refractive index |
1.393 (20 ° C) |
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safety instructions | |||||||||||||||||||
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C |
2-methylbutyric acid methyl ester is a fruit flavor from the group of carboxylic acid esters .
Occurrence
2-Methylbutyric acid methyl ester is an important odor-active component of pineapples , apples , cantaloupes , cucumbers and strawberries .
The connection was found in a number of other natural products such as fresh strawberry juice , apricots , sour cherries , melons , peas , baked potatoes, peppermint oil , spearmint, thymus , durian (Durio zibethinus), olives , mushrooms, star fruit , prickly pears , dill herbs , cashew apples , cherimoya , Loquat , mountain papaya , cape gooseberries and rooibos tea, (Aspalathus linearis) blueberries and cheese. The levorotatory and racemic forms are known in nature .
Extraction and presentation
Methyl 2-methylbutyrate can be obtained by reacting 2-butene with methanol and carbon monoxide under pressure and in the presence of a palladium compound or an acid as a catalyst .
properties
Methyl 2-methylbutyrate is a highly flammable, volatile, colorless liquid with a fruity odor that is sparingly soluble in water. The compound has a sweet, fruity, apple-like odor and an apple-like taste in low concentrations.
use
Methyl 2-methylbutyrate is used as a flavoring substance .
safety instructions
The vapors of methyl 2-methylbutyrate can form an explosive mixture with air ( flash point 16 ° C).
Individual evidence
- ↑ a b c d e f g h i j Entry on 2-methylbutyric acid methyl ester in the GESTIS substance database of the IFA , accessed on December 17, 2018(JavaScript required) .
- ↑ a b c d George A. Burdock: Fenaroli's Handbook of Flavor Ingredients . CRC Press, 2016, ISBN 978-1-4200-9086-4 , pp. 1316 ( limited preview in Google Book search).
- ↑ a b Data sheet Methyl 2-methylbutyrate, ≥98%, FCC, FG from Sigma-Aldrich , accessed on December 17, 2018 ( PDF ).
- ↑ H.-D. Belitz, Werner Grosch, Peter Schieberle: Textbook of food chemistry . Springer-Verlag, 2007, ISBN 978-3-540-73202-0 , p. 865 ( limited preview in Google Book search).
- ↑ Jürgen Falbe: Syntheses with carbon monoxide . Springer-Verlag, 2013, ISBN 978-3-642-95008-7 , pp. 206 ( limited preview in Google Book search).