1,3,5-Tri-methyl-benzene

Dinitro-mesitylene (2,4-Dinitro-l, 3,5-tri-methyl benzene). C9H10N2O4, mw 210.21,... 

Dinitro-1,3,5-tri methyl benzene Di-(P-nitroxyethyl) ammonium nitrate a, a -Di-(nitroxyl) methylether... 

CsHis 1,2,3-Tri methyl benzene l-Methyl-3-propyl- Benzene 176.08 96.8 0.1 33,97... 

Aminohemimellitene 5 Am ino-1,2,3- tri methyl -benzene or 3,4,5 Trimethy oni line (Amin o-hemellitol in Ger), HaN- C8Ha(CH,)5. Ndls, mp ca 75°. Can be prepd by heating sym-m-xylidene hydrochloride with methanol, or by other methods... 

Azido 1,2,3 tri methyl benzene or Azido-hemimellitene. See under Hemimellitene and Derivatives... 

Amino-mesitylene 1 -Amino-1,3,5-tri-methyl-benzene 3,5-Dimethylbenzylomine or Mesitylamine, H2N-CHj-C6H3(CH3)2 is described in Beil 12,1163... 

Azi do- 1,2,4-tri methyl benzene or Azidopseudo-cumene. See under Pseudocumene and Derivatives... 

C8H180 tert-butyl isobutyl ether 33021-02-2 182.03 11.989 2 17009 C9H12 1,2,4-tri methyl benzene 95-63-6 229.33 13.190 1... 

Mesitylene from Allylene.— In a similar way methyl acetylene or allylene polymerizes and yields mesitylene which is tri-methyl benzene. 

Pseudo-cumene, 1-2-4-Tri-methyl benzene, unsymmetrical. Hemelithene, 1-2-3-Tri-methyl benzene, vicinal. 

The proof that these three compounds are all tri-methyl benzenes is that by oxidation they each yield first a mono-basic acid second a di-basic acid and finally a tri-basic acid. 

Mesitylene, 1-3-5- Tri-methyl Benzene.— Taking up first mesity-lene, two reactions show. that this particular hydrocarbon must have the 1-3-5 Of symmetrical constitution. I... 

Clearly the only tri-methyl benzene that can thus always yield 1-3-dimethyl benzene is the one in which the three methyl groups are in the symmetrical positions, the 1-3-5 positions, so that whichever methyl group is oxidized the remaining two will be in the 1-3 positions. Further oxidation of mesitylene gives a di-basic acid which yields toluene, and complete oxidation of the methyl groups gives finally a tri-basic acid which yields benzene. 

Substitution Products of Mesilylene.—final proof of the structure of mesitylene is the fact that it yields only one mono-substitution product, and only one di-substitution product, when the substitution takes place in the benzene ring. This will appear clear on examination without writing out the formulas. As all three of the unsubstituted hydrogens of mesitylene remaining in the benzene ring are exactly alike in relation to the methyl groups it can make no difference which one or which two are substituted, the product will be the same. This condition exists only in the case of the 1-3-5-tri-methyl benzene and in neither of the other two, the 1-2-3 or tho 1-3-4 compounds. 

Pseudo-cumene, 1-2-4-Tri-methyl Benzene.—The second hydrocarbon, isomeric with mesitylene, and therefore tri-methyl benzene, is known as pseudo-cumene. It occurs also in coal tar, and resembles mesitylene in its properties. Its boiling point is 169°. Its structure is proven to be 1-2-4-tri-methyl benzene from the following reactions. 

Pseudo-cumene from Brom para-Xylene and Brom meta-Xylene. Bl om para-xylene, as will be recalled from the discussion of the constitution of para-xylene, exists only in one form as no isomeric compounds are possible. This substance, by means of Fittig s synthesis, yields pseudo-cumene, the constitution of which, therefore, can only be I-3-4-tri-methyl benzene. 

Hemelithene, 1-2-3-Tri-methyl Benzene.— The third isomeric tri-methyl benzene is known as hemelithene and proves to be the 1-2-3 compound. It resembles the other two isomers, and like them is found in coal tar. It boils at 175 . 

Pseudocumidine.—Pseudocumene or 1-2-4-tri-methyl benzene (unsymmetrical) yields an amino derivative, viz., 1-2-4-tri-methyl-5-amino benzene. It is obtained from technical xylidine by simply heating with methyl alcohol. 

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