Fungsi dari transition sound adalah
t the end of this book.
Ether is on the mandatory snitch list in amounts above 25 gallons, and
you can take it to the bank that regular chemical outlets will be
following the letter of the law. You can also bet that connections met
through the waste exchanges are mostly concerned with getting the
stuff off their hands, not kissing up to the DBA. The serious
experimenter may wish to try substituting benzene for ether, since it is
not now on the mandatory snitch list.
The alkaloids are next extracted out of the ether solution into
decimolar (15 grams per liter) tartaric acid in water. The alkaloids
form a salt with the tartaric acid that is soluble in water, and leave the
extraneous plant compounds in the ether. This extraction should be
done four times with a volume of tartaric-acid solution that is oneseventh
the volume of the ether solution. For example, with about 40
gallons of ether solution in a drum, extract with about 6 gallons of
tartaric acid solution four times. This means a fresh six gallons on
each extraction. If a stubborn emulsion forms, the addition of a little
alcohol to the mix will break it.
Tartaric acid is the preferred acid for this extraction because the
tartaric acid salt of the alkaloids is relatively stable in light. A .2N
solution of sulfuric acid can be used instead if precautions are taken to
protect the solution from exposure to light. This method may be
preferable because it has become a hassle to buy tartaric acid.
Recently, at my place of work, I had occasion to order one pound of
Rochelle salts (potassium sodium tartarate) from a major chemical
supplier. This material was for use in a laboratory scale cyanide
copper plating bath, where the Rochelle salt acts as a complexor. To
get them to sell me this material, I had to answer a battery of
questions, in spite of the fact that the firm at which I work has had a
long customer relationship with this major chemical supplier. Less
scrutiny of tartaric acid purchases would likely be encountered from a
firm which supplies chemicals to the plating industry. To get tartaric
Extraction And Isolation Of
The Lysergic Acid Amides
acid from Rochelle salts, just dissolve them in water, and then add
hydrochloric acid until the pH of the decimolar solution reaches 2.
The tartaric-acid solution containing the alkaloids should now be
free-based, preferably with ammonia. The ammonia should be added
slowly with vigorous stirring until the pH of the solution reaches 8 to
8.5. A higher pH must be avoided, since at these pHs racemization to
the inactive iso form of lysergic occurs.
The free-based alkaloids can now be extracted out of the water
solution into ether. The extraction should be done four times, each
time with a volume of ether 1A that of the water solution. The
combined ether extracts should be dried over some magnesium sulfate
previously wetted with ether to prevent it from absorbing alkaloid
during the drying process.
You have been warned
Speed Freak will give you a
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kelebihan chef dan @ Tuesday, March 11, 2014 8:24:31 PM: