That the lactim ethers I will undergo rearrangements to their isomeric and stable Zactam configurations I1 has been known for a long time. These transformations are not reversible and are brought about by the application of heat or through the influence of special catalytic agents, and have been observed to take place in both the acyclic and cyclic series of organic compounds.*.
[Kristiansen, Marianne; Eriksen, Jens; Joergensen, Karl Anker Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1990 , # 1 p. 101 - 103]