Parahexyl

Parahexyl (Synhexyl, n-hexyl-Δ3-THC, (C6)-Δ6a(10a)-THC) is a synthetic homologue of THC, which was invented in 1949 during attempts to elucidate the structure of Δ9-THC, one of the active components of cannabis.[1][2]

Parahexyl
Clinical data
ATC code
  • none
Legal status
Legal status
Identifiers
CAS Number
  • 117-51-1 Y
    36482-24-3 (n-hexyl-Δ9-THC)
PubChem CID
ChemSpider
UNII
Chemical and physical data
FormulaC22H32O2
Molar mass328.496 g·mol−1
3D model (JSmol)
  (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.[3] 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.[4] 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.[5]

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.

Isomerism

At least three isomers of parahexyl have been studied and are known to be active as cannabinoids. Parahexyl itself (i.e. the Δ6a(10a) isomer) has not had any significant use in scientific research since it was banned internationally in the early 1980s, however the Δ8 and Δ9 isomers are both known to be cannabinoid receptor agonists, and Δ8-parahexyl has the code number JWH-124.[6][7]

Dibenzopyran and monoterpenoid numbering of tetrahydrocannabinol derivatives
7 double bond isomers of parahexyl and their 30 stereoisomers
Dibenzopyran numberingMonoterpenoid numberingNumber of stereoisomersNatural occurrenceConvention on Psychotropic Substances Schedule
Short nameChiral centersFull nameShort nameChiral centers
Δ6a(7)-parahexyl9 and 10a3-hexyl-8,9,10,10a-tetrahydro-6,6,9-trimethyl-6H-dibenzo[b,d]pyran-1-olΔ4-parahexyl1 and 34Nounscheduled
Δ7-parahexyl6a, 9 and 10a3-hexyl-6a,9,10,10a-tetrahydro-6,6,9-trimethyl-6H-dibenzo[b,d]pyran-1-olΔ5-parahexyl1, 3 and 48Nounscheduled
Δ8-parahexyl6a and 10a3-hexyl-6a,7,10,10a-tetrahydro-6,6,9-trimethyl-6H-dibenzo[b,d]pyran-1-olΔ6-parahexyl3 and 44Nounscheduled
Δ9,11-parahexyl6a and 10a3-hexyl-6a,7,8,9,10,10a-hexahydro-6,6-dimethyl-9-methylene-6H-dibenzo[b,d]pyran-1-olΔ1(7)-parahexyl3 and 44Nounscheduled
Δ9-parahexyl6a and 10a3-hexyl-6a,7,8,10a-tetrahydro-6,6,9-trimethyl-6H-dibenzo[b,d]pyran-1-olΔ1-parahexyl3 and 44Nounscheduled
Δ10-parahexyl6a and 93-hexyl-6a,7,8,9-tetrahydro-6,6,9-trimethyl-6H-dibenzo[b,d]pyran-1-olΔ2-parahexyl1 and 44Nounscheduled
Δ6a(10a)-parahexyl93-hexyl-7,8,9,10-tetrahydro-6,6,9-trimethyl-6H-dibenzo[b,d]pyran-1-olΔ3-parahexyl12NoSchedule I

Note that 6H-dibenzo[b,d]pyran-1-ol is the same as 6H-benzo[c]chromen-1-ol.

See also: Tetrahydrocannabinol § Isomerism

See also

References
  1. Adams R, Harfenist M, Loewe S (1949). "New Analogs of Tetrahydrocannabinol. XIX". J. Am. Chem. Soc. 71 (5): 1624–1628. doi:10.1021/ja01173a023.
  2. Ask Dr. Shulgin Online March 7, 2001
  3. Ono M, Shimamine M, Takahashi K, Inoue T (1974). "[Studies on hallucinogens. VII Synthesis of parahexyl]". Eisei Shikenjo Hokoku. Bulletin of National Institute of Hygienic Sciences (in Japanese). 49 (92): 46–50. PMID 4477495.
  4. Fairchild MD, Jenden DJ, Mickey MR, Yale C (January 1980). "EEG effects of hallucinogens and cannabinoids using sleep-waking behavior as baseline". Pharmacology, Biochemistry, and Behavior. 12 (1): 99–105. doi:10.1016/0091-3057(80)90422-0. PMID 6102770. S2CID 24865915.
  5. Supniewski J (1950). Farmakologia. Warsaw: PZWL. p. 89.
  6. Martin BR, Jefferson R, Winckler R, Wiley JL, Huffman JW, Crocker PJ, Saha B, Razdan RK (September 1999). "Manipulation of the tetrahydrocannabinol side chain delineates agonists, partial agonists, and antagonists". The Journal of Pharmacology and Experimental Therapeutics. 290 (3): 1065–79. PMID 10454479.
  7. Bow EW, Rimoldi JM (2016). "The Structure-Function Relationships of Classical Cannabinoids: CB1/CB2 Modulation". Perspectives in Medicinal Chemistry. 8: 17–39. doi:10.4137/PMC.S32171. PMC 4927043. PMID 27398024.
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