On the other hand, SWISM has become convinced that isosafrole has a limited shelf-life, either that or he mistreated it badly somehow. About 14 months after first isomerizing and distilling some isosafrole, he rediscovered the container, decided to throw it all into a peracetic, and got back exactly 0g of ketone (and a lot of tar and some isosafrole). Repeated the procedure using freshly made & distilled isosafrole, and got back 67% yield of ketone (after distillation). Not enough data to draw a conclusion, but it's got him thinking...
(I'm betting that whatever was wrong with that old iso, a distillation would have fixed it)