Patent ID: 8410293

Claim:
A process for the preparation of cyclic enol ethers of the formulae (I) and/or (II) which comprises cyclization of a starting compound of the formula (III) in which m is zero (0), one (1) or two (2), R 1 is an organic radical with 1 to 20 carbon atoms, R 2 is hydrogen or an organic radical having 1 to 20 carbon atoms, or the radicals R 1 and R 2 , together with the atoms connecting them, form a mono- or polycyclic, substituted or unsubstituted ring system with 3 to 20 carbon atoms which can also comprise heteroatoms selected from the group consisting of the elements Si, N, P, O, and S, R 3 is hydrogen or an organic radical with 1 to 20 carbon atoms, R 4 is hydrogen or an organic radical with 1 to 20 carbon atoms, and R 5 is hydrogen or an organic radical with 1 to 20 carbon atoms, in the presence of a Brönstedt acid or Lewis acid, where the reaction is carried out as reactive distillation, where the formed cyclic enol ethers of the formulae (I) and/or (II) are separated off from the starting compound of the formula (III) by distillation from the reaction mixture.