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Phenethylamine [1] | |
---|---|
| |
Chemical name | 2-Phenylethylamine |
Other names | Phenethylamine β-Phenylethylamine 2-Phenyl-1-aminoethane β-Aminoethylamine 2-Phenylethanamine |
Chemical formula | C8H11N |
Molecular mass | 121.18 g/mol |
CAS number | [64-04-0] |
Density | 0.964 g/cm3 |
Melting point | -60 °C |
Boiling point | 194.5-195 °C |
SMILES | c1ccccc1CCN |
NFPA 704 |
|
Disclaimer and references |
Phenethylamine (PEA), or β-Phenylethylamine, is an alkaloid and monoamine. In the human brain, it is believed to function as a neuromodulator or neurotransmitter (trace amine). Phenethylamine is a natural compound biosynthesized from the amino acid phenylalanine by enzymatic decarboxylation. It is also found in many foods such as chocolate, especially after microbial fermentation. It has been suggested that phenethylamine from food may have psychoactive effects in sufficient quantities. However, it is quickly metabolized by the enzyme MAO-B, preventing significant concentrations from reaching the brain.
Substituted phenethylamines are a broad and diverse class of compounds that include neurotransmitters, hormones, stimulants, hallucinogens, entactogens, anorectics, bronchodilators, and antidepressants. The phenethylamine structure can also be found as part of more complex ring systems such as the ergoline system of LSD or the morphinan system of morphine.
Chemistry[]
Phenethylamine is an aromatic amine which is a colorless liquid at room temperature. It is soluble in water, ethanol, and ether.[1] Similar to other low molecular weight amines, it has a fishy odor. Upon exposure to air, it forms a solid carbonate salt with carbon dioxide. Phenethylamine is strongly basic and forms a stable crystalline hydrochloride salt with a melting point of 217 °C. Phenethylamine is also a skin irritant and possible sensitizer.
Chocolate theory of love[]
In the early 1980s, chemistry of love researcher Michael Libowitz, author of the popular 1983 book The Chemistry of Love, remarked to reporters that “chocolate was loaded with PEA”. This became the focus for an article in The New York Times, which was then taken up by the wire services, then by magazine free-lancers, and evolved into the now eponymous “chocolate theory of love”.[2]
Substituted phenethylamines[]
Substituted phenethylamines carry additional chemical modifications at the phenyl ring, the sidechain, or the amino group:
- Substituted Amphetamines are homologues of phenethylamines carrying an alpha-methyl (α-CH3) group at the sidechain carbon atom next to the amino group.
- Catecholamines are phenethylamines carrying two hydroxy groups in positions 3 and 4 of the phenyl ring. Examples are the hormones and neurotransmitters dopamine, epinephrine (adrenaline), and norepinephrine (noradrenaline).
- The aromatic amino acids phenylalanine and tyrosine are phenethylamines carrying a carboxyl group (COOH) in alpha position.
- 2C's are phenethylamines with methoxy groups attached to the 2 and 5 carbons and no alpha-methyl group.
Pharmacology[]
Many substituted phenethylamines are pharmacologically active drugs due to their similarity to the monoamine neurotransmitters:
- Stimulants like the plant alkaloids ephedrine and cathinone and the synthetic drug dextroamphetamine and methylphenidate.
- Hallucinogens like the plant alkaloid mescaline and the synthetic drug 2C-B.
- Empathogen-entactogens like MDMA (ecstasy) and MDA.
- Anorectics like phentermine, fenfluramine, and amphetamine.
- Bronchodilators like salbutamol and ephedrine.
- Antidepressants like venlafaxine, bupropion and the monoamine oxidase inhibitors phenelzine and tranylcypromine.
Substitution table[]
Some of the more important phenethylamines are tabulated below. For simplicity, the stereochemistry of the sidechain is not covered in the table. Hundreds of other simple synthetic phenethylamines are known. This is due in part to the pioneering work of Alexander Shulgin, much of which is described in the book PiHKAL.
Short Name | Rα | Rβ | R2 | R3 | R4 | R5 | RN | Full Name |
---|---|---|---|---|---|---|---|---|
Tyramine | OH | 4-hydroxy-phenethylamine | ||||||
Dopamine | OH | OH | 3,4-dihydroxy-phenethylamine | |||||
Epinephrine (Adrenaline) | OH | OH | OH | CH3 | β,3,4-trihydroxy-N-methyl-phenethylamine | |||
Norepinephrine (Noradrenaline) | OH | OH | OH | β,3,4-trihydroxyphenethylamine | ||||
Salbutamol | OH | OH | CH2OH | C(CH3)3 | β,4-dihydroxy-3-hydroxymethyl-N-(t)-butyl-phenethylamine | |||
Beta-Methyl-phenethylamine | CH3 | β-methyl-phenethylamine | ||||||
Amphetamine | CH3 | α-methyl-phenethylamine | ||||||
Methamphetamine | CH3 | CH3 | N-methyl-amphetamine | |||||
Methylphenidate | N,α-butylene-β-methoxycarbonyl-phenethylamine | |||||||
Ephedrine, pseudoephedrine |
CH3 | OH | CH3 | N-methyl-β-hydroxy-amphetamine | ||||
Cathine | CH3 | OH | β-hydroxy-amphetamine | |||||
Cathinone | CH3 | =O | β-keto-amphetamine | |||||
Methcathinone | CH3 | =O | CH3 | N-methyl-β-keto-amphetamine | ||||
Bupropion | CH3 | =O | Cl | C(CH3)3 | 3-chloro-N-(t)-butyl-β-keto-amphetamine | |||
Fenfluramine | CH3 | CF3 | CH2CH3 | 3-trifluoromethyl-N-ethyl-amphetamine | ||||
Phentermine | CH3,CH3 | α,α-dimethyl-phenethylamine | ||||||
Mescaline | OCH3 | OCH3 | OCH3 | 3,4,5-trimethoxy-phenethylamine | ||||
MDA | CH3 | -O-CH2-O- | 3,4-methylenedioxy-amphetamine | |||||
MDMA | CH3 | -O-CH2-O- | CH3 | 3,4-methylenedioxy-N-methyl-amphetamine | ||||
MDMC | CH3 | =O | -O-CH2-O- | CH3 | 3,4-methylenedioxy-N-methyl-β-keto-amphetamine | |||
DOM | CH3 | OCH3 | CH3 | OCH3 | 2,5-dimethoxy-4-methyl-amphetamine | |||
DOB | CH3 | OCH3 | Br | OCH3 | 2,5-dimethoxy-4-bromo-amphetamine | |||
DON | CH3 | OCH3 | NO2 | OCH3 | 2,5-dimethoxy-4-nitro-amphetamine | |||
2C-B | OCH3 | Br | OCH3 | 2,5-dimethoxy-4-bromo-phenethylamine | ||||
2C-C | OCH3 | Cl | OCH3 | 2,5-dimethoxy-4-chloro-phenethylamine | ||||
DOI | CH3 | OCH3 | I | OCH3 | 2,5-dimethoxy-4-iodo-amphetamine | |||
2C-I | OCH3 | I | OCH3 | 2,5-dimethoxy-4-iodo-phenethylamine | ||||
2C-D | OCH3 | CH3 | OCH3 | 2,5-dimethoxy-4-methyl-phenethylamine | ||||
2C-E | OCH3 | CH2CH3 | OCH3 | 2,5-dimethoxy-4-ethyl-phenethylamine | ||||
2C-F | OCH3 | F | OCH3 | 2,5-dimethoxy-4-Fluoro-phenethylamine | ||||
2C-N | OCH3 | NO2 | OCH3 | 2,5-dimethoxy-4-Nitro-phenethylamine | ||||
2C-T-2 | OCH3 | SCH2CH3 | OCH3 | 2,5-dimethoxy-4-ethylthio-phenethylamine | ||||
2C-T-4 | OCH3 | SCHCH3CH3 | OCH3 | 2,5-dimethoxy-4-(i)-propylthio-phenethylamine | ||||
2C-T-7 | OCH3 | SCH2CH2CH3 | OCH3 | 2,5-dimethoxy-4-propylthio-phenethylamine | ||||
2C-T-8 | OCH3 | SCH2CHCH2CH2 | OCH3 | 2,5-dimethoxy-4-cyclopropylmethylthio-phenethylamine | ||||
2C-T-9 | OCH3 | S-(CH3)3C | OCH3 | 2,5-dimethoxy-4-(t)-Butylthio-phenethylamine | ||||
2C-T-21 | OCH3 | SCH2CH2F | OCH3 | 2,5-dimethoxy-4-(2-fluoroethylthio)-phenethylamine |
Graphical overview[]
See also[]
References[]
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External links[]
- MSDS for phenethylamine
- Book II of PiHKAL online
- Review and summary of PiHKAL, including table of 300+ phenethylamines: ascii postscript
- A Structural Tour of PiHKAL
- Link page to external chemical sources.
{2C-B} {2C-C} {2C-D} {2C-E} {2C-I} {2C-N} {2C-T-2} {2C-T-21} {2C-T-4} {2C-T-7} {2C-T-8} {3C-E} {4-FMP} {Bupropion} {Cathine} {Cathinone} {DESOXY} {Dextroamphetamine} {Methamphetamine} {Diethylcathinone} {Dimethylcathinone} {DOC} {DOB} {DOI} {DOM} {bk-MBDB} {Dopamine} {Br-DFLY} {Ephedrine} {Epinephrine} {Escaline} {Fenfluramine} {Levalbuterol} {Levmetamfetamine} {MBDB} {MDA} {MDMA} {bk-MDMA/MDMC/MDMCat/Methylone} {MDEA} (MDPV) {Mescaline} {Methcathinone} {Methylphenidate} {Norepinephrine} {Phentermine} {Salbutamol} {Tyramine} {Venlafaxine}
Psychedelic phenethylamines
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Aleph • 2C-B • 2C-B-FLY • 2C-C • 2C-D • 2C-E • 2C-F • 2C-G • 2C-I • 2C-N • 2C-O • 2C-O-4 • 2C-P • 2C-T • 2C-T-2 • 2C-T-4 • 2C-T-7 • 2C-T-8 • 2C-T-9 • 2C-T-13 • 2C-T-15 • 2C-T-17 • 2C-T-21 • 2C-TFM • 3C-E • 3C-P • Br-DFLY • DESOXY • DMMDA-2 • DOB • DOC • DOET • DOI • DOM • DON • Escaline • Ganesha • HOT-2 • HOT-7 • HOT-17 • Isoproscaline • Lophophine • MDA • MMDA • MMDA-2 • MMDA-3a • MMDMA • Macromerine • Mescaline • Proscaline • TMA |
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