Were you prompt about pulling the flask off the hotplate and either working with it right then or sticking it in the freezer after the reflux? Once, swinl fell asleep right before he was supposed to take off the flask and accidently let a batch reflux for 17 hrs. He thought, what the fuck, and tried to work it through the rest of the way. Distilled off the DCM, but NOTHING would come over under the vacuum. After a few hours, it polymerized and shot through the setup. Fucking sucked to clean up. I would attribute this to ketone decomposition b/c its never happened any other time.
We need new drugs.