Book II of PiHKAL: A Chemical Love Story. Alexander & Ann Shulgin #67: DOI
SYNTHESIS: A mixture of 14.8 g phthalic anhydride and 19.5 g of 2,5-dimethoxyamphetamine (2O. After the hot melt remained quiet for a few moments, it was allowed to cool to about 50 °C and then diluted with 100 mL of hot MeOH. The solution was stirred until homogenous, seeded with product, and then cooled in an ice bath to complete the crystallization. After removal of the product by filtration, washing sparingly with MeOH, and air drying, there was obtained 24.6 g of N-(1-(2,5-dimethoxyphenyl)-2-propyl)phthalimide as off-white crystals, with a mp of 105–106 °C. Anal. (C19H19NO4) C,H,N.
To a solution of 2.0 g N-(1-(2,5-dimethoxyphenyl)-2-propyl)phthalimide in 15 mL warm acetic acid which was being vigorously stirred, there was added a solution of 1.2 g iodine monochloride in 3 mL acetic acid. This was stirred for 2 h at about 40 °C during which time there was a definite lightening of color, but no solids formed. The reaction mixture was poured into 600 mL H2O which produced a reddish glob floating in a yellow-orange opaque aqueous phase. The glob was physically removed, dissolved in 30 mL boiling MeOH which, on cooling in an ice bath, deposited off-white crystals. These were removed by filtration, washed with MeOH, and air dried to give 1.5 g of N-[1-(2,5-dimethoxy-4-iodophenyl)-2-propyl]phthalimide as fine white crystals with a slight purple cast. The mp was 103–105.5 °C and the mixed mp with the starting non-iodinated phthalimide (mp 105–106 °C) was depressed (85–98 °C). Extraction of the aqueous phase, after alkalinification, provided an additional 0.15 g product. Anal. (C19H18NO4) C,H,N.
A solution of 0.75 g N-(1-(2,5-dimethoxy-4-iodophenyl)-2-propyl)phthalimide in 10 mL EtOH was treated with 0.3 mL of hydrazine hydrate, and the clear solution was held at reflux on the steam bath overnight. After cooling, there was a crystallization of 1,4-dihydroxyphthalizine that started as small beads but finally became extensive and quite curdy. These solids were removed by filtration and had a mp of about 340 °C (reference samples melted over a five to ten degree range in the area of 335–350 °C). The filtrate was dissolved in 100 mL CH2Cl2 and extracted with 2×150 mL 0.1 N HCl. The aqueous extracts were washed once with CH2Cl2, made basic with 5% NaOH, and extracted with 3×100 mL CH2Cl2. Removal of the solvent under vacuum gave 0.5 g of a colorless oil which was dissolved in 300 mL anhydrous Et2O and saturated with anhydrous HCl gas. There was obtained, after filtration, and air drying, 0.35 g of 2,5-dimethoxy-4-iodoamphetamine hydrochloride (DOI) as white crystals that melted at 200.5–201.5 °C. This value did not improved with recrystallization. Anal. (C11H17ClINO2) C,H,N.
DOSAGE: 1.5–3.0 mg.
DURATION: 16–30 h.
QUALITATIVE COMMENTS: (with 0.6 mg) “There was a nice spacey light-headedness for a few hours, and time seemed to move quite slowly. Then a generic sadness came over me, as I reminisced about earlier days (recalling pleasures now gone) and wondered if I would be allowed to be here on the Farm when I am old and not important. There is so much to be done, and I cannot do it all, and no one else cares. My mood became present-day and healthy by about the seventh hour.”
(with 1.6 mg) “The general nature of the experience was depressing, with a sad view of life. There was no way I could connect with my emotions. Even my sadness was vague. At about the ninth hour I decided that enough was enough, and this strangely disappointing about-plus-two was aborted with 125 micrograms of
(with 3.0 mg) “This is a clear, clean psychedelic. The eyes-closed imagery is excellent, with clearly delineated patterns, pictures, and colors. Perfect for an artist, and next time I’ll devote some time to painting. Total ease for the body, but no help for my smoking problem. I still want to smoke. And at sixteen hours into this I am still at 1.5+ but I’ll try to go to bed anyway, and sleep.”
(with 3.5 mg) “I was at a full crashing +++ for about three or four hours. There was none of the
(with 1.0 mg of the “R” isomer) “There was a clear ++ from the second to the eighth hour, but somehow there was not quite the elegance or the push of the racemate. I was sensible, and managed to do several technical chores in a reasonable way. Easy sleep at 15 hours into it.”
(with 2.3 mg of the “R” isomer) “The water solution of the hydrochloride salt has a slightly sweetish taste! I was at a +++ without question, but there was a slight down mood towards the end. And it lasted a really long time; I was distinctly aware of residual stuff going on, well into the next day.”
(with 6.3 mg of the “S” isomer) “I was at a benign one-and-a-half plus at about two hours, and finally flattened out at a ++. Would I double this dose? Probably not, but half again (to 9 or 10 milligrams) would feel safe for a plus 3. By evening I was near enough baseline to drive into town for a social obligation, but even when trying to sleep later that night there was some residue of imagery; remarkably, it was all in slow motion. The fantasies were slow-paced and sluggish. It would have been interesting to have explored eyes-closed during the day.”
EXTENSIONS AND COMMENTARY: Again, as with every other psychedelic amphetamine analogue which has a chiral center and has been explored as the individual optical isomers, it is the “R” isomer that is the more potent. And again, the other isomer, the “S” isomer, still shows some activity. The same was true with
A number of studies with DOI in animal models have shown it to have an extremely high binding capacity to what are called the 5-HT2 receptors.
Thus, there were
The four-carbon butylamine homologue (the 20H21NO4) C,H,N. This was iodinated with iodine monochloride in acetic acid to give N-[1-(2,5-dimethoxy-4-iodophenyl)-2-butyl]phthalimide which was chromatographically distinct from the uniodinated starting material (silica gel, CH2Cl2 ), but which did not crystallize. This was treated with hydrazine hydrate in ethanol to provide 3CN/EtOH to give white crystals with a mp of 217–218.5 °C and an analysis (C12H19CINO2) C,H,N. This butyl homolog of DOI has been assayed at up to four milligrams, and is without any central effects whatsoever. An experiment with 12.4 microcuries of 131I labelled material with the whole body scanner showed most of it accumulating in the gut and liver, with almost none to the brain.
For those who find such statistics interesting, the parent compound DOI vies with
A very important, centrally pivotal, and completely paradoxical compound in this area, is the N,N-dimethyl homologue of DOI, or 2,5-dimethoxy-N,N-dimethyl-4-iodoamphetamine (
About PiHKAL • info
This version of Book II of PiHKAL is based on the Erowid online version, originally transcribed by Simson Garfinkle and converted into HTML by Lamont Granquist. I drew also on “Tyrone Slothrop’s” (Unfinished) Review of PIHKAL to enumerate the many analogues mentioned in PiHKAL but not described at length. Many, many others have since been added.
I have tried here to expunge any artifacts introduced by the earlier transcriptions and restore the typographic niceties found in the printed edition. I’ve also made minor changes to some chemical names in line with current nomenclature practice. Typically the change is little more than expanding a prefix or setting it in italics. The errata and changes page has further details.
“At the present time, restrictive laws are in force in the United States and it is very difficult for researchers to abide by the regulations which govern efforts to obtain legal approval to do work with these compounds in human beings.“No one who is lacking legal authorization should attempt the synthesis of any of the compounds described in these files, with the intent to give them to man. To do so is to risk legal action which might lead to the tragic ruination of a life. It should also be noted that any person anywhere who experiments on himself, or on another human being, with any of the drugs described herein, without being familiar with that drug’s action and aware of the physical and/or mental disturbance or harm it might cause, is acting irresponsibly and immorally, whether or not he is doing so within the bounds of the law.”
The copyright for Book I of PiHKAL has been reserved in all forms and it may not be distributed. Book II of PiHKAL may be distributed for non-commercial reproduction provided that the introductory information, copyright notice, cautionary notice and ordering information remain attached.
PiHKAL is the extraordinary record of the authors’ years exploring the chemistry and transformational power of phenethylamines. This book belongs in the library of anyone seeking a rational, enlightened and candid perspective on psychedelic drugs.
Though Sasha and Ann have put Book II of PiHKAL in the public domain, available to anyone, I strongly encourage you to buy a copy. We owe them — and there’s still nothing quite like holding a real book in your hands.
PiHKAL (ISBN 0-9630096-0-5) is available for US$24.50 (plus $10 domestic first-class shipping) from Transform Press.Transform Press,
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