I want to carry out a reaction at around 280 °C, the problem is stirring. PTFE magnetic beads have a temperature tolerance limit of 260 °C and pyrex coated magnetic beads have a tolerance limit of 274 °C, but in some publications the authors have mentioned carrying out stirring at 280 °C, I don't know how they did it. I don't think an overhead stirrer will work,  we can't use an overhead stirrer along with a condenser and nitrogen purging!! Is there any other kind of magnetic bead that can tolerate the temperature of 280 °C?