G. M. Zhdankina, L. Kozlova, G. Kryshtal
Dec 1, 1987
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Journal
Bulletin of the Academy of Sciences of the USSR, Division of chemical science
Abstract
Conclusions1.Catalytic hydrogenation of a mixture of isomeric 2,2,4-methoxydiethoxy-6,10-dimethylundeca-5,9-dienes over skeletal nickel in ethanol at 50°C and a hydrogen pressure of 50–80 atm gives good yields of 4-ethoxy-6,10-dimethyl-undecan-2-ol (as a mixture of stereoisomers), which is a convenient intermediate for the preparation of 6,10-dimethyl-undec-3-en-2-one.2.Depending on the catalyst and the conditions used, 2,2,4-trialkoxy-6,10-dimethyl-undeca-5,9-diene gives selectively four different products of hydrogenation and hydro-genolysis.3.Hydrogenation of citronellal over 2% Pd/C in methanol at 40°C and 40 atm of hydrogen gives 80% of 3,7-dimethyloctanal dimethyl acetal.