1.It was shown that, under the conditions of catalytic hydrogenation at 280–290° and 100–120 atm. 3,3,4-trimethyl-2-pentanol yields a mixture of 2,3,3- and 2,3,4-trimethylpentanes, the latter predominating. The formation of this mixture of isomers is due to the isomerization of the initial reaction product. 3,3,4-trimethyl-1-pentene.2.It was shows that in the pyrolysis of the acetic ester of 3,3,4-trimethyl-2-pentanol at 430–450° isomerization again occurs, not only 3,3,4-trimethyl-1-pentene being formed, but also much 2,3,4-trimethyl-1-pentene [4]. This method for the preparation of hydrocarbons cannot therefore be recommended at a general method for the preparation of the higher branched olefins.3.For comparison with the octane isomers obtained by the hydrogenation of 3,3,4-trimethyl-2-pentanol and by the pyrolysis of its acetic ester, 2,3,3-trimethylpentane was synthesized by the Grignard