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PL Cannabinoid · Semi-synthetic
HHC-O-acetate (HHC-O) is a semi-synthetic, intoxicating acetylated form of HHC with minimal human research, and like other acetate cannabinoids it can form toxic ketene gas when heated.
Where it fits
HHC-O-acetate (HHC-O) derives from HHC. See the Synthetic & altered cannabinoids index for how it relates to the rest of the family.
What the research shows
Direct human research on HHC-O-acetate (HHC-O) is minimal; it is characterised mainly by its chemistry and its place in the cannabinoid family rather than by clinical studies. We flag that plainly rather than overstate it.
Safety
Acetate cannabinoids can form toxic ketene gas when heated and must never be vaped. See THC-O-acetate.
Phenolic acetylation chemistry and thermal ketene formation
Hexahydrocannabinol-O-acetate (HHC-O, C23H34O3) is a semi-synthetic cannabinoid ester produced by O-acylating the phenolic hydroxyl group of hexahydrocannabinol (HHC) with acetic anhydride (Ujvary, 2023, PubMed PMID 37356888). Analytical pyrolysis studies of acetylated cannabinoids demonstrate that heating cannabinoid acetates at vaping temperatures cleaves the phenyl acetate group and releases ketene gas (CH2=C=O), a potent pulmonary toxicant associated with severe acute lung injury (Munger et al., 2022, PubMed PMID 35801872).
FAQ
Is HHC-O intoxicating?
Yes. HHC-O-acetate acts as a lipophilic prodrug that is hydrolyzed by metabolic esterases into active HHC, producing delayed but intoxicating CB1-mediated effects.
Where does HHC-O come from?
HHC-O does not occur in cannabis plants; it is synthesized in a chemical laboratory by treating hexahydrocannabinol (HHC) with acetic anhydride.
Why is vaping or smoking HHC-O considered hazardous?
Peer-reviewed pyrolysis experiments show that heating cannabinoid acetate esters like HHC-O and THC-O cleaves the acetate group to form ketene gas, a severe lung toxicant.
Part of the NOIDS cannabinoids index. Educational reference, not medical advice.
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