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Chemistry and Pharmacology of Delta-8-Tetrahydrocannabinol

202418 citationsOpen accessAlexandria University

In plain language

Delta-9-tetrahydrocannabinol is the primary psychoactive compound in cannabis with recognized medical uses, but its clinical utility is often limited by side effects. Delta-8-tetrahydrocannabinol is another psychoactive cannabinoid that occurs naturally in low yields but is growing in popularity because of its greater stability and more straightforward synthetic manufacturing methods. Commercial interest grew substantially in the United States following the 2018 Farm Bill, leading to marketed consumer products that rely on synthetic sources of the compound. Because synthetic production can introduce impurities, including residual reagents and reaction side products, chemical analysis and impurity detection are critical. The review covers the extraction, purification, synthesis, and structural elucidation of delta-8-tetrahydrocannabinol, alongside its pharmacological profile and interactions with CB1 and CB2 cannabinoid receptors relative to delta-9-tetrahydrocannabinol.

Key takeaways

  • Delta-8-tetrahydrocannabinol offers better stability and simpler synthetic manufacturing processes compared to delta-9-tetrahydrocannabinol.
  • The compound occurs naturally in cannabis only in very low yields, meaning commercial products rely on synthetic production.
  • Synthetic delta-8-tetrahydrocannabinol can contain impurities from starting materials, reagents, and reaction side products that require specific analytical methods for detection.
  • The pharmacological profile includes interactions with both CB1 and CB2 cannabinoid receptors in comparison with delta-9-tetrahydrocannabinol.

Why it matters

As commercial markets for alternative cannabinoids expand, understanding the chemical properties and potential health effects of synthetic products becomes vital. Delta-8-tetrahydrocannabinol offers an alternative to conventional cannabis compounds, but synthetic manufacturing can introduce unknown impurities. Clarifying its extraction, synthesis, and pharmacology helps researchers and regulators ensure product quality, standardise analytical testing, and better understand how it behaves in the human body.

Commercialisation angle

The work addresses an already active commercial market for synthetic delta-8-tetrahydrocannabinol products. It directly informs chemical manufacturers, analytical testing laboratories, and regulatory bodies seeking methods to purify the compound and detect residual synthesis impurities. While the commercial market exists today, the review focuses on analytical characterisation and pharmacological comparison rather than outlining a new commercial product pathway.

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Abstract

<i>Cannabis sativa</i> is one of the oldest plants utilized by humans for both economic and medical purposes. Although the use of cannabis started millennia ago in the Eastern hemisphere, its use has moved and flourished in the Western nations in more recent centuries. <i>C. sativa</i> is the source of psychoactive cannabinoids that are consumed as recreational drugs worldwide. The C21 aromatic hydrocarbons are restricted in their natural occurrence to cannabis (with a few exceptions). Delta-9-tetrahydrocannabinol (Δ<sup>9</sup>-THC) is the main psychoactive component in cannabis, with many pharmacological effects and various approved medical applications. However, a wide range of side effects are associated with the use of Δ<sup>9</sup>-THC, limiting its medical use. In 1966, another psychoactive cannabinoid, Delta-8-tetrahydrocannabinol (Δ<sup>8</sup>-THC) was isolated from marijuana grown in Maryland but in very low yield. Δ<sup>8</sup>-THC is gaining increased popularity due to its better stability and easier synthetic manufacturing procedures compared to Δ<sup>9</sup>-THC. The passing of the U.S. Farm Bill in 2018 led to an increase in the sale of Δ<sup>8</sup>-THC in the United States. The marketed products contain Δ<sup>8</sup>-THC from synthetic sources. In this review, methods of extraction, purification, and structure elucidation of Δ<sup>8</sup>-THC will be presented. The issue of whether Δ<sup>8</sup>-THC is a natural compound or an artifact will be discussed, and the different strategies for its chemical synthesis will be presented. Δ<sup>8</sup>-THC of synthetic origin is expected to contain some impurities due to residual amounts of starting materials and reagents, as well as side products of the reactions. The various methods of analysis and detection of impurities present in the marketed products will be discussed. The pharmacological effects of Δ<sup>8</sup>-THC, including its interaction with CB1 and CB2 cannabinoid receptors in comparison with Δ<sup>9</sup>-THC, will be reviewed.

Research topics

  • Cannabis and Cannabinoid Research
  • GABA and Rice Research
  • Forensic Toxicology and Drug Analysis

Read the original research

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DOI: 10.3390/molecules29061249

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