Parahexyl

Parahexyl (Synhexyl, n-hexyl-Δ3-THC, (C6)-Δ6a(10a)-THC) is a synthetic homologue of THC which was invented in 1941 during attempts to elucidate the structure of Δ9-THC, one of the active components of cannabis.

Parahexyl
Clinical data
ATC code
  • none
Legal status
Legal status
Identifiers
  • 3-n-hexyl- 7,8,9,10-tetrahydro- 6,6,9-trimethyl- 6H-dibenzo(b,d)pyran- 1-ol
CAS Number
PubChem CID
ChemSpider
UNII
KEGG
Chemical and physical data
FormulaC22H32O2
Molar mass328.496 g·mol−1
3D model (JSmol)
  • Oc2cc(cc1OC(C\3=C(/c12)CC(CC/3)C)(C)C)CCCCCC
  • InChI=1S/C22H32O2/c1-5-6-7-8-9-16-13-19(23)21-17-12-15(2)10-11-18(17)22(3,4)24-20(21)14-16/h13-15,23H,5-12H2,1-4H3 Y
  • Key:OORFXDSWECAQLI-UHFFFAOYSA-N Y
  (verify)

Parahexyl is similar in both structure and activity to THC, differing only in the position of one double bond and the lengthening of the 3-pentyl chain by one CH2 group to n-hexyl. Parahexyl produces effects typical of other cannabinoid receptor agonists in animals. It has a somewhat higher oral bioavailability than THC itself but is otherwise very similar. Presumably, it acts as a CB1 agonist in the same way as THC, but as there has been no research published using parahexyl since the discovery of the CB1 receptor, this has not been definitively confirmed.

Parahexyl was occasionally used as an anxiolytic in the mid-20th century, the dosage ranging from 5 mg to 90 mg.

Parahexyl was made illegal under UN convention in 1982 on the basis of its structural similarity and similar effects profile to THC. Parahexyl was placed into the most restrictive Schedule 1 as a compound with no medical use, despite the now-known medical uses for cannabinoids.

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