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Author: Subject: N-bromo Succinimide
runlabrun
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[*] posted on 8-2-2005 at 23:22
N-bromo Succinimide


Just a question on synthesis of this compound.....
Could this be achieved by the following scheme, see if im on the right track:

1) Succinic acid (HOOC-CH2-CH2-COOH) heated with ammonia to form succinimide (slight variation on --> http://themerckindex.cambridgesoft.com/TheMerckIndex/NameRea...).

2) As per rhodiums synthesis of NBS:
1.62mol (160g) succinimide is dissolved in a mixture of 1.60mol (64g) NaOH, 300g crushed ice and 400ml water. Cool the mixture in an ice bath, and add 85ml (1.65 mol, 264g) Br2 at once while stirring violently. Stir for two more minutes, then filter the precipitated product and wash with ice water. Dry in a desiccator. Yield 75-81%.

Would this work?
Thanks.
-rlr
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Mephisto
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[*] posted on 9-2-2005 at 04:31


Yes, you're right. You can also heat succinic acid with urea to 175 °C to get your succinimide. In Gattermann 'Die Praxis des Organischen Chemikers' (don't know if it’s translated) there are preparations of succinimide from succinic acid and ammonia and succinic acid and formamide. The NBS-synthesis is described there too.

Does anybody tried to substitute NBS with OTC pool brominators? It might even work better than NBS, like the example of NCS and TCCA (for water-disinfection) shows. It only depends from what those pool brominators are made of. Because they giving bromine very slowly away, I am optimistic, that they might be as selective as NBS.




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Mephisto
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[*] posted on 9-2-2005 at 05:41
OTC brominating agents


Common OTC pool brominators consists either of BCDMH (1-Bromo-3-chloro-5,5-dimethylhydantoine => product: Aquabrome) or DBDMH (1,3-Dibromo-5,5-dimethylhydantoine => product: Albrom).

DBDMH:

BCDMH reacts with water to form both hypochlorous and hypobromous acids. DBDMH forms only the hypobromous acid and should be sufficient for bromination. As I am in hurry, I would be glad if someone could check DBDMHs ability as brominating agent.

I think, this gives a good summary of possible OTC brominating agents.

~Mephisto




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enima
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[*] posted on 9-2-2005 at 08:20


Yup, it can brominate. Works well only on activated rings..


Tetradehdron Letters, Vol. 38. No. 25 pp. 4415-4416, 1997

anisole is brominated with a 85% yield (18 hours)
1,3-dimethoxybenzene is brominated with a 98% yield, (18 hours).
2-methylphenol is dibrominated.

Anisaldehyde, toluene and 2-picoline fails bromination.

more info in the article... have no time..
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[*] posted on 9-2-2005 at 11:47
OTC halogenation


Check it out:...N-Chloro and N-bromosaccharins: valuable reagents for halogenation of electron rich aromatics and cohalogenation of alkenes
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S...

NCSac and NBSac are synthed from sodium saccharin and KBr/KCl and oxone.:D
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[*] posted on 9-2-2005 at 12:19
Merci


Nice. Just wanted to say thank you for both references!



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[*] posted on 10-2-2005 at 02:25
Great!


This reagent is a great advancement in OTC chemistry. Thanks for the info. Hopefully this product can be located OTC in EU as wellt. Bye, bye NBS...



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[*] posted on 20-2-2005 at 13:24
?


Anyone have the iodide/iodate method formerly at www.rhodium.ws/chemistry/aromatic.iodination.iodide-iodate.h...
(taken from Tetrahedron Letters 44(27), 5099-5101 (2003))
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[*] posted on 20-2-2005 at 14:38


there are plenty of rhodium mirrors around, search for them and you can easily find the page you want...

-rlr
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[*] posted on 23-2-2005 at 13:52
A U2U to another


.,.member at this board has prompted me to post what I should have included earlier. Euroscientists...where you see oxone, insert virkon.

;)
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[*] posted on 5-3-2005 at 17:47


Just remember that this stuff is good for radical reactions, too.



I don\'t understand what you are saying, but I agree with every word of it!
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[*] posted on 6-3-2005 at 04:26


Quote:

Just remember that this stuff is good for radical reactions, too.


Truly. For the times peroxides and AIBN are inaccessible... :D

sparky (^_^)

[Edited on 6-3-2005 by sparkgap]




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Mephisto
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[*] posted on 14-3-2005 at 12:11


This idea of brominating with DBDMH was just a fast thought. However, in very rare cases DBDMH is even more efficient then NBS. For example to dibrominate piperonylic acid (as I said, these cases are very rare). As I scanned two articles about DBDMH-bromating to inform myself about its possibilities, I can also share these articles:

[color=darkred]Tetrahedron Letters, Vol. 34, No. 6, pp. 931-934 (1993)[/color]
Title:
N-Bromosuccinimide, Dibromodimethylhydantoin in Aqueous Base: A Practical Method for the Bromination of Activated Benzoic Acids
Abstract: A new bromination method employing NBS or dibromodimethylhydantoin in aqueous base is described for the synthesis of 3-bromo-2,6-dimcthoxybenzoic acid (1) and other monobrominated alkoxy benzoic acids.

[color=darkred]Tetrahedron Letters, Vol. 38, No. 25, pp. 4415-4416 (1997)[/color] - found by enima
Title:1,3-Dibromo-5,5-Dimethylhydantoin, a useful Reagent for Aromatic Bromination
Abstract: 1,3-dibromo-5,5-dimethylhydantoin (DBDMH) is a useful and easy to handle reagent for bromination of various aromatic derivatives substituted with electron donating groups. In the presence of trimethylsilyltrifluoromethanesulfonate, DBDMH showed increased reactivity, and in one case, the reaction followed another pathway, suggesting an alternative mechanism.

BTW: Has anybody seen DBDMH containing products in Europe? It seems that the Albemarle products 'XtraBrom' and 'Albrom' are only available on the US-market.

****
Both articles are attached.

Attachment: Both.Articles.rar (207kB)
This file has been downloaded 663 times





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[*] posted on 15-3-2005 at 00:11


Nice find Mephiso. I wonder how well the DBDHM would work on activated aldehyde groups. Those are very nice yields for the bromination of benzoic acids. I must say very impressive.
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[*] posted on 15-3-2005 at 11:59


Quote:

BTW: Has anybody seen DBDMH containing products in Europe? It seems that the Albemarle products 'XtraBrom' and 'Albrom' are only available on the US-market


Yes indeedy...Maxibrom and Allbrom are what you're looking for (possibly other brands as well but I don't have time to check). Btw the first hit on google UK for either of those two products gives a company which also sells an item called "Shock II" which you may find interesting/useful ;)
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[*] posted on 16-3-2005 at 03:18


UpNatom: I searched for the Dibromdimethylhydantoine, while Allbrom and Maxibrom contain Bromochlorodimethylhydantoine. There is a chance that the bromochloro-mix works too, as Br is a better substituent than Cl, but to be on the safe side I am looking only for the chlorine free substance.



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[*] posted on 16-3-2005 at 13:04


My apologies Mephisto, you are correct in that Maxibrom contains Bromochlorodimethylhydantoin as well as the dibromo compound however allbrom (according to the manufacturers MSDS) contains only the dibromo compound.

You can find the msds here: http://www.aldenleeds.com/html/allbrom.html
[Edited on 16-3-2005 by UpNatom]

[Edited on 16-3-2005 by UpNatom]
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Mephisto
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[*] posted on 16-3-2005 at 13:32


Oh, sorry - you're right. Seems like I opened the Maxibrom-PDF twice instead of the Allbrom-PDF, my fault. And thank you for your search of course.

~Mephisto




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