Dimethoxybenzenes
| Dimethoxybenzenes | ||||||
| Surname | 1,2-dimethoxybenzene | 1,3-dimethoxybenzene | 1,4-dimethoxybenzene | |||
| other names |
o -Dimethoxybenzene pyrocatechol dimethyl ether veratrole |
m -Dimethoxybenzene resorcinol dimethyl ether |
p -Dimethoxybenzene hydroquinone dimethyl ether |
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| Structural formula |
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| CAS number | 91-16-7 | 151-10-0 | 150-78-7 | |||
| 27598-81-8 (mixture of isomers) | ||||||
| PubChem | 7043 | 9025 | 9016 | |||
| Molecular formula | C 8 H 10 O 2 | |||||
| Molar mass | 138.17 g mol −1 | |||||
| Physical state | liquid | firmly | ||||
| Melting point | 22.5 ° C | −58 ° C | 56 ° C | |||
| boiling point | 207 ° C | 217 ° C | 213 ° C | |||
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GHS labeling |
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| H and P phrases | 302 | no H-phrases | no H-phrases | |||
| no EUH phrases | no EUH phrases | no EUH phrases | ||||
| no P-phrases | no P-phrases | no P-phrases | ||||
In chemistry, the dimethoxybenzenes form a group of substances consisting of a benzene ring with two attached methoxy groups (–OCH 3 ) as substituents . Their different arrangement results in three constitutional isomers with the empirical formula C 8 H 10 O 2 . They can be understood as the dimethyl ether of dihydroxybenzenes ( pyrocatechol , resorcinol and hydroquinone ). 1,2-Dimethoxybenzene is known by its common name Veratrol .
properties
1,4-Dimethoxybenzene has the highest melting point due to the greatest molecular symmetry.
presentation
The dimethoxybenzenes can be prepared from the dihydroxybenzenes ( pyrocatechol , resorcinol and hydroquinone ) by etherification with dimethyl sulfate .
Individual evidence
- ↑ a b c d e f CRC Handbook of Tables for Organic Compound Identification , Third Edition, 1984, ISBN 0-8493-0303-6 .
- ↑ Data sheet 1,2-Dimethoxybenzene from Sigma-Aldrich , accessed on March 13, 2017 ( PDF ).
- ↑ Data sheet 1,3-Dimethoxybenzene from Sigma-Aldrich , accessed on March 13, 2017 ( PDF ).
- ↑ Data sheet 1,4-Dimethoxybenzene from Sigma-Aldrich , accessed on March 13, 2017 ( PDF ).
- ^ Association of authors: Organikum , 19th edition, Johann Ambrosius Barth, Leipzig · Berlin · Heidelberg 1993, ISBN 3-335-00343-8 , p. 209.
Web links
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