Tetrahydrocannabinol (THC) (C₂₁H₃₀O₂) — Properties, Uses & Safety

Overview

Tetrahydrocannabinol (THC), with the molecular formula C21H30O2 and a molar mass of 314.46 g/mol, is the primary psychoactive compound found in cannabis (Cannabis sativa). It appears as a glassy solid at room temperature and is highly lipophilic (fat-soluble), which affects how it is absorbed, distributed, and stored in the body. THC's structure features a dibenzopyran ring system with a phenolic hydroxyl group and a pentyl side chain. It exerts its psychoactive effects by binding to cannabinoid receptor type 1 (CB1) in the brain, mimicking the action of endogenous cannabinoids (endocannabinoids) like anandamide. This interaction affects neurotransmitter release and influences mood, memory, appetite, pain perception, and motor coordination. THC is studied extensively for potential medical applications including pain management, nausea relief during chemotherapy, appetite stimulation in wasting diseases, and treatment of certain forms of epilepsy. Synthetic THC (dronabinol) is an FDA-approved medication. The legal status of THC varies widely around the world, making it a compound at the intersection of chemistry, medicine, law, and social policy. THC has a GHS hazard code of H302 (harmful if swallowed), with the exclamation pictogram. From a chemistry education perspective, THC illustrates several important concepts: terpenoid biosynthesis (THC is derived from a monoterpene and a phenol precursor), stereochemistry (the 6a,10a-trans configuration is critical for activity), receptor-ligand interactions and the lock-and-key model, lipophilicity and its effects on pharmacokinetics, and the relationship between molecular structure and biological activity. For students learning chemistry, THC provides a compelling case study in how understanding molecular structure helps explain drug action, and it opens discussions about the role of chemistry in medicine, ethics, and public policy.

IUPAC Name

(6aR,10aR)-6,6,9-trimethyl-3-pentyl-6a,7,8,10a-tetrahydro-6H-benzo[c]chromen-1-ol

CAS Number

1972-08-3

PubChem CID

16078

Molecular Formula

C₂₁H₃₀O₂

Molar Mass

314.462 g/mol

State at STP

solid

Appearance

Glassy solid at room temperature