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AssigneeEnichem Anic S.p.A.
InventorsGiuseppe Messina, Mario D. Moretti, Salvatore R. Sanna, Giovanni Soma, Pier G. Cabras
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A process for the synthesis of vinyl ethers of formula ##STR1## wherein R.sub.1 and R.sub.2, each independently, represent hydrogen or a primary, secondary or tertiary alkyl group, R.sub.3 is a hydrogen, a primary alkyl, phenyl, or substituted phenyl group, or R.sub.2 and R.sub.3, taken together, represent a polymethylene chain containing from 3 to 10 carbon atoms wherein one or more hydrogens can be replaced by methyl or ethyl groups, and R is a primary, secondary or tertiary alkyl group, which comprises reacting a suitably selected dioxolane derivative of formula II ##STR2## wherein R.sub.1, R.sub.2, and R.sub.3 are as defined above, and R.sub.4, R.sub.5, R.sub.6, and R.sub.7, each independently, represent hydrogen or an alkyl group, with a boric acid ester of formula III B(OR).sub.3 III wherein R is as defined above, in the vapor phase, at a temperature comprised between 100.degree. and 400.degree. C., and in the presence of an acidic heterogeneous catalyst.
A process for preparing a vinyl ether of general formula I ##STR7## wherein R.sub.1 and R.sub.2, are selected from the group consisting of hydrogen or a primary, secondary or tertiary alkyl group, R.sub.3 is selected from the group consisting of hydrogen, a primary alkyl, phenyl, or phenyl substituted with up to 3 substituents, which may be the same or different, and which are inert toward boric acid esters and permit vaporization of the dioxolane compounds of formula II at a temperature below 400.degree. C., or R.sub.2 and R.sub.3, taken together, represent a polymethylene chain containing from 3 to 10 carbon atoms wherein one or more hydrogen atoms may be replaced by methyl or ethyl groups, and
Dependencies are inferred from the claim text.