This publication lists nicely how to generate un-natural products form natural products by microwave radiation (reaction, extraction). Some examples:

* Microwave-assisted conversion of Camptothecin into Mappicine ketone (just microwave for 7 minutes, no solvent used)
* Microwave-assisted conversion of Berberine to Berberrubine (using a domestic (house) microwave for 5 min)

This chapter of the Springer series shows, that if you use microwave extraction, be sure to have a targeted analysis and monitor the reactions in your little microwave reactor. It’s no secret that under microwave radiation high pressures and high temperatures occur. Compare that to sonochemistry (application of ultrasound) where we have the same symptoms (cavitation bubbles with high pressure and high temperature).

Check the whole series here: Microwave Methods in Organic Synthesis

Phytotoxic compounds are well known to specialists in this field, this article discusses VOCs (volatile chemicals) and how they affect the growth of plants. Some interesting pictures given showing the growth inhibition by Pseudomonas fluorescens strains and other strains on Arabidopsis.