Re: ORGLIST:Normality of EtMgBr in Ether

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From: Norwid-Rasmus Behrnd (behrndnr$##$yahoo.de)
Date: Tue Jul 20 2004 - 13:01:46 EDT


Dear S. Narayan Murthy,

the normality of organometallic reagents may be determinded by titration. Often,
procedures as introduced by Watson and Eastham are used (J. Organomet. Chem. 1967, Vol.
9, p. 165 "Colored indicators for simple direct titration of magnesium and lithium
reagents"), for example for organolithiums based on compunds like diphenyl acetic acid.

More recently, Kiljunen and Hase introduced an other indicator, 1-Pyrene acetic acid and
obtained good results with grignard reagents and even lithium diisopropylamide, too ; the
reference for this article is: J. Org. Chem. 1991, Vol. 56, p.6950 "Titration of
Orgonolithiumus and Grignards with 1-Pyreneacetic Acid".

Good luck,

Norwid

--- S Narayan Murthy <snmurthy$##$iitb.ac.in> schrieb: > hai..
> if any one knows !!!how to find the normality of Ethyl magnesium bromide
> in ether or THF.
> Thanks in advance
>
> S.N.Murthy
> Graduate student
> Dept of Chemistry
> IIT-Bombay
> India
>
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