Delta-9-Tetrahydrocannabinol (THC) is a naturally occurring isomer of THC found in cannabis plants. It's psychoactive effects are well known. While delta-9-THC is the most abundant isomer of THC, there is interest in the lesser studied delta-8-THC isomer.
IUPAC Naming Convention
The diagram below has numbered positions on the top left ring structure. If the double bond is at the 9 position then the molecule's name is delta-9-THC. If the double bond is at the 8 position the molecule's name is delta-8-THC.
The molecule pictured is delta-8-THC for example.
The reaction
Delta-8-THC isomer can be made from Delta-9-THC in a spinning band distillation system. Mix in 4% acidic alumina silicate with your extracted and winterized crude cannabis oil. Distill the cannabis oil and collect the THC distillate as you normally would. The combination of the acidic alumina silicate and boiling flask heat will catalyze the rearrangement of the THC molecule from delta-9 to delta-8-THC.
The effect
Delta-8-THC is said to give a less intense and longer lasting high than the delta-9 isomer. Some are experimenting with different ratios of delta-8 to delta-9. If you have tried delta-8-THC, let us know about your experience!
Warning - Lawyer Stuff
Use this information at your own risk. Please use some common sense if you want to try this. Find and SOP from a trusted source. Don't make your first attempt with a large batch of crude extract ($$$). It may take a number of tries to perfect the technique. Experiment with small batches that won't break you if they fail. Move up in batch size as your skill level and confidence increase.