Re: Odczynniki-prekursory

No no nie udzielalem sie wczesniej zbyt czesto, a tu no prosze calkiem mila grupa,
i o nalkowych sprawach mozna porozmawiac :)

Mozna prosic o literature zrodlowa ?

Pozdrawiam
Zydor

 
> Ktorz to wie jakie czasy przyjda :)
>
> A jezeli chodzi o chlorowanie acetonu to chyba chlor podstawi sie i z
> jednej
> i z drugirj strony, ta dalej ta kondensacja (a raczej chyba to sie nazywa
> postawienie nukleofilowe :) ) to zajdzie z oboma chlorami czyli wyjdzie
> cos
> podoblego ale nie takiego.... Czy nie mowie prawdy ??
>
> Pozdrawiam
> Zydor
>
> Chloroaceto otzrymuje sie w wyniku chlorowania acetonu w srodowisku
> kwasnym
> mam podac konkretna reakcje i przepis?
> Chloroacetone [1]
> Good method of preperation 150 ml acetone 50 ml water 12 g Cupric chloride
> 6
> g lithium chloride. Reflux till reaction completes. Literature states 24
> hours but the reaction has a half-life of about 24 minutes at 20°C (same
> article half of marker in 24 minutes, the marker being oxygen consumption
> in
> a slightly different reaction), therefore 5 hours is probably sufficient
> at
> reflux.
>
> After reacting, distill everything below 123°C. The still bottoms can be
> reprocessed to recover cuprous chloride and lithium chloride. Both can be
> recovered by disolving with minimum water. The mix is easily converted to
> cupric chloride-lithium chloride by boiling with 20-35% hydrochloric
> acid.
>
> Redistill slowly through a packed column to remove acetone. This leaves
> two
> fractions one distilling at 89C which is water and chloroacetone and the
> second distilling at 121°C which is ?pure? chloroacetone. The second
> fraction may contain unsymetrical dichloroacetone I haven't had a sample
> analysed. Calcium Chloride will crash the water-chloroacetone mix which
> tends to form a colloidal solution.
>
> Chloroacetone must be stabalized with 1% calcium carbonate or 0.1% water
> if
> it is stored or it forms an explosive sludge. Distillation of a
> water-chloroacetone mix at 89°C is the most efficient way of separating
> unsym-dichloroacetone from commercial products.
>
> Pozdrawiam
> Ch
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Received on Mon May 17 13:57:04 2004