Bigger reactions than 1000ml of safrole that have the tendency to bump violently, apparently magnetic stirring isn't good enough anymore. For our industrially oriented bees: using a capillary to introduce a stream of air bubbles, comparable to good old-fashioned vacuum distillation should work to circumvent the batch size limitation.
https://www.thevespiary.org/rhodium/Rhodium/chemistry/isomerizafrole.html (https://www.thevespiary.org/rhodium/Rhodium/chemistry/isomerizafrole.html)