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Waffles SS
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Indole Synthesis
Fischer indole synthesis:
It seems this is not very difficult.
Anybody has experience/suggestion/better or easier method?
.Fischer, E.; Jourdan, F. Ber. 1883, 16, 2241.
.Fischer, E.; Hess, O. Ber. 1884, 17, 559.
.Van Orden, R. B.; Lindwell, H. G. Chem. Rev. 1942, 30, 69-96.
.Robinson, B. Chem. Rev. 1963, 63, 373-401.
. Robinson, B. Chem. Rev. 1969, 69, 227-250
Source:wikipedia
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sonogashira
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I haven't, but you can look here http://www.orgsyn.org/orgsyn/prep.asp?prep=cv3p0479 in 'discussion' section for alternatives. There is also book called - Indoles best synthetic
methods - which you may find interesting. Best luck!
[Edited on 19-12-2009 by sonogashira]
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Waffles SS
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| Quote: |
passing a mixture of acetylene and aniline through an iron tube at 700.
Majima, Unno, and Ono, Ber., 55, 3854 (1922).
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I heve ketene Equipment therefore i think is usefull for this method too.
Anybody has idea or instruction for this method?
[Edited on 19-12-2009 by Waffen SS]
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Nicodem
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Indole itself can not be prepared from phenylhydrazine and acetaldehyde using the most common conditions for the Fischer indole synthesis. The
reaction is possible, but requires quite some modified conditions. I already posted about this (references included) in some old thread about the same
subject, so UTFSE to find it. However, Fischer indole synthesis can be used to prepare indole indirectly by decarboxylating 2-indolecarboxylic acid
prepared from phenylhydrazine and pyruvic acid.
…there is a human touch of the cultist “believer” in every theorist that he must struggle against as being
unworthy of the scientist. Some of the greatest men of science have publicly repudiated a theory which earlier they hotly defended. In this lies their
scientific temper, not in the scientific defense of the theory. - Weston La Barre (Ghost Dance, 1972)
Read the The ScienceMadness Guidelines!
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Waffles SS
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Quote: Originally posted by Nicodem  | | However, Fischer indole synthesis can be used to prepare indole indirectly by decarboxylating 2-indolecarboxylic acid prepared from phenylhydrazine
and pyruvic acid. |
Thanks @Nicodem but I need reaction instruction?amount?temp?...?
You have it?
[Edited on 19-12-2009 by Waffen SS]
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sonogashira
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Here is an indole chemistry review. See what is best method to you and then ask for the references for the experimental 
Attachment: cr60095a004.pdf (301kB)
This file has been downloaded 6786 times
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entropy51
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| Quote: Originally posted by Nicodem | There is no method to prepare indole itself by using the Fischer cyclisation.
Utmost it is possible to prepare indole-2-caboxylic acid with the Fischer cyclisation of pyruvic acid phenylhydrazone. Indole-2-caboxylic acid can
then be decarboxylated to indole.
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If you follow that quote back to the thread it came from (click on the green -> , Nicodem gives some advice about how to find the type of information you seek.
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Nicodem
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Sonogashira already gave you the link to the Org. Synth. entry where you could have looked up for these references:
"Indole-2-carboxylic acid has also been prepared by the Fischer indole synthesis from pyruvic acid phenylhydrazone catalyzed by zinc chloride"
: E. Fischer, Ann., 236, 141 (1886); Ber., 19, 1563 (1886).
"...followed by reduction to indole-2-carboxylic acid and decarboxylation of the latter" : Reissert, Ber., 30, 1045 (1897).
Both journals are available online, so you do not even have to visit a library. There surely are other references for this process, but I leave the
literature search to others.
…there is a human touch of the cultist “believer” in every theorist that he must struggle against as being
unworthy of the scientist. Some of the greatest men of science have publicly repudiated a theory which earlier they hotly defended. In this lies their
scientific temper, not in the scientific defense of the theory. - Weston La Barre (Ghost Dance, 1972)
Read the The ScienceMadness Guidelines!
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Waffles SS
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phenylhydrazone?
Unfortunately i have access just to phenylhydrazine but i dont have information on phenylhydrazone synthesis.
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Nicodem
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Huh?
Am I mistaken or you never bothered to read about the mechanism of the Fischer indole synthesis even though you posted the scheme of it in the first
post above?
I suggest you to check that scheme again, because it nicely says "phenylhydrazone" under the first reaction intermediate.
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entropy51
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Waffen, I told you that making ketene without a fume hood wasn't good for you!
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Waffles SS
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Ohhhh.
Excuse me i mistaked.
Iam interesting on Reissert indole synthesis because i think is cheaper and easier.
But i dont know instruction and dont have access to online journal(all of online journals that i know arent free).
Reissert, A. Ber. 1897, 30, 1030.
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Nicodem
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| Quote: Originally posted by Waffen SS | Ohhhh.
But i dont know instruction and dont have access to online journal(all of online journals that i know arent free).
Reissert, A. Ber. 1897, 30, 1030.
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But Berichte is free: http://gallica.bnf.fr/ark:/12148/bpt6k907462.pleinepage.f103...
Using the search engines to obtain information is always a good idea.
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Peroxid
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This is a modified method (the first step is same), but maybe it will be useful!
http://www.orgsyn.org/orgsyn/prep.asp?prep=cv5p0567
[Edited on 19-12-2009 by Peroxid]
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Stramonium
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Out of interest, if one was to heat a homogenous mixture of NaOMe (commercial) and N-formyl-o-toluidine to a high temperature as per http://www.orgsyn.org/orgsyn/prep.asp?prep=cv3p0479 , would the indole be expected to distill off in a reasonable (but lower than that using
K-t-BuO) yield? Any need for an initial solvent, or would dry distillation theoretically suffice?
"The cyclization of N-formyl-o-toluidine with sodium in methanol has been described and is recommended as a safer and less expensive method than that
involving the use of potassium metal." Galat and Friedman, J. Am. Chem. Soc., 70, 1280 (1948).
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Waffles SS
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@Nicodem,thanks i know Reissert was from deutschland but i dont know germany.
[Edited on 20-12-2009 by Waffen SS]
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Nicodem
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Then why the hell do you use such an irritating german username? Just to annoy us or what? And why did you ask for the information if you did not want
it in the first place? And what does it matter if it is in german? Have you never heard of dictionaries and translation machines?
For the internet challenged: http://translate.google.com/
This is the last time I help you. Now I give up. 
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JohnWW
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After the War/Whore, members (or at least officers) of the Waffen SS (who were a large elite para-military secret police force, responsible for
rounding up and deporting Jews and other dissidents in Nazi-occupied areas to death camps, mostly on the eastern front) were prosecuted in war crimes
courts for belonging to a criminal organization. (SS = Schützstaffel). See: http://en.wikipedia.org/wiki/Waffen-SS , http://www.waffen-ss.com , http://www.jewishvirtuallibrary.org/jsource/holocaust/waffen... , http://en.wikipedia.org/wiki/Police_forces_of_Nazi_Germany , http://en.wikipedia.org/wiki/Category:Nazi_SS , http://en.wikipedia.org/wiki/Schutzstaffel , http://en.wikipedia.org/wiki/Gestapo .
I hope you were not among them. You would have to be at least 80 now, to have been; Pope Rat was conscripted into the SS in early 1945 at age 17, one
of its youngest members.
BTW When you made your indole, how did you deal with, or suppress, its intense fecal smell? Did you wear a gas mask? Did the neighbors complain?
Ironically, in very small amounts, the stuff is used in perfumes.
[Edited on 22-12-09 by JohnWW]
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entropy51
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Well, John, for once I have to agree with you (I always agree with Nicodem, I'm no dummy), this does seem to be a fairly obnoxious user
name. Waffen SS, why don't you re-register with a user name that evokes less memory of crimes against humanity. If not for moral reasons,
then because Nicodem is not a source of information to disregard lightly.
John, he hasn't made any indole. He seems to be unlikely to make indole or anything else. Probably not a bad thing.
[Edited on 22-12-2009 by entropy51]
[Edited on 22-12-2009 by entropy51]
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Waffles SS
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My believe is my believe and this is chemistry forum nothingelse,sure i have acceptable reason for my choice and my believe.
back to chemistry
I wanna use indole(iaa,iba) as hormone in some trees(for fast growing,..)
[Edited on 22-12-2009 by Waffen SS]
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not_important
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Have you read the literature on using IAA on woody plants and trees? From what I recall, it really is only effective for the first few months from
sprouting, later on it just encourages root growth.
If you are planning the classic synthysis of IAA from indole and glycolic acid, you must have a stirred autoclave for running the reaction at 250 C /
40 atmospheres pressure.
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JohnWW
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Indole as a growth hormone for plants? Actually, it is indole-3-acetic acid, or 2-(1H-indol-3-yl)acetic acid, that is used for this purpose, see http://en.wikipedia.org/wiki/Indole-3-acetic_acid and http://www.super-grow.biz/IAA.jsp among others. It is probably the most important plant auxin, occurring naturally in the apical cells of growing
plants. It can be synthesized by the reaction of indole with glycolic acid in the presence of base at 250°C.
[Edited on 22-12-09 by JohnWW]
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not_important
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Yes, the collection of spineless bullies did say "indole(iaa,iba)" where IAA is a common abbreviation of indole acetic acid, and IBA for indole
butyric acid.
The Fischer synthesis can be used to directly produce IIA and IBA or simple derivatives of them, without going through indole in an intermediate step.
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Waffles SS
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I have problem with Fischer indole synthesis For making IAA.
@Nicodem said this reaction need special condition and he suggest Phenylhydrazone+Pyruvic acid but i need more detail about it.
Anyone can send refrence or instruction about that?
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entropy51
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| Quote: Originally posted by Waffen SS | My believe is my believe and this is chemistry forum nothingelse,sure i have acceptable reason for my choice and my believe.
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In addition to a chemistry forum, it is a community. Some members of that community may have very
personal reasons, such as the murder of relatives by the Waffen SS, to find your "believes" and reasons not acceptable. But suit yourself.
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