Cyclohexene carotinoid intermediates
AssigneeBASF SE
InventorsManfred Baumann, Werner Hoffmann
Life of this patent
Estimating the term…
Abstract
1-[3-Methyl-3,5,5-trialkoxy-pent-1-yn-1-yl]-2,6-dimethyl-cyclohex-1-enes, which may or may not be methyl-substituted in the 2- and/or 6-position, are obtained by reacting the corresponding 1-[3-methyl-but-1-yn-3-en-1-yl]-2,6-dimethyl-cyclohex-1-enes with orthoformic acid esters in the presence of acid condensing agents. The new compounds provide a new method of access to the compounds of carotinoid chemistry, especially to vitamin A, which avoids the conventional expensive synthesis via phosphorus ylide compounds.
Claims3
A cyclohexene derivative of the general formula I ##STR10## wherein R.sup.1 and R.sup.2 are hydrogen or methyl, and R.sup.3 is alkyl of 1 to 4 carbon atoms.
1-[3-Methyl-3,5,5-tri methoxy-pent-1-yn-1-yl]-2,6,6-trimethyl-cyclohex-1-ene.
1-[3-Methyl-3,5,5-triethoxy-pent-1-yn-1-yl]-2,6,6-tr imethyl-cyclohex-1-ene.
Dependencies are inferred from the claim text.