Pentamethylbenzene
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| General | ||||||||||||||||
| Surname | Pentamethylbenzene | |||||||||||||||
| Molecular formula | C 11 H 16 | |||||||||||||||
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| properties | ||||||||||||||||
| Molar mass | 148.25 g mol −1 | |||||||||||||||
| Physical state |
firmly |
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| density |
0.917 g cm −3 (25 ° C) |
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| Melting point |
49-51 ° C |
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| boiling point |
231 ° C |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | ||||||||||||||||
Pentamethylbenzene is a benzene substituted by five methyl groups and thus an aromatic hydrocarbon .
It is a solid with a melting point of 49-51 ° C. In comparison with the tetramethylbenzenes , this is lower than that of Durol at 79.2 ° C due to the lower symmetry . However, it is also higher than that of Isodurol at −20 ° C and Prehnitol at −6.3 ° C due to the higher degree of substitution .
It arises from the reaction of formaldehyde / HCl with xylene mixtures .
literature
- HW Earhart, Andrew P. Komin: "Polymethylbenzenes", Kirk-Othmer Encyclopedia of Chemical Technology , 2000 ( doi : 10.1002 / 0471238961.1615122505011808.a01 ).
Individual evidence
- ↑ a b c d e data sheet pentamethylbenzene from Sigma-Aldrich , accessed on March 26, 2017 ( PDF ).
- ↑ Julius v. Braun , Johannes Nelles: “Convenient synthesis of durol and pentamethylbenzene from crude xylene”, in: Reports of the German Chemical Society , 1934 , 67 (6), pp. 1094-1099; doi: 10.1002 / cber.19340670635 .
Web links
- Entry on pentamethylbenzene . In: P. J. Linstrom, W. G. Mallard (Eds.): NIST Chemistry WebBook, NIST Standard Reference Database Number 69 . National Institute of Standards and Technology , Gaithersburg MD