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Water or a mixture of water and isopropanol or a mixture of water or acetone is preferably used.

From these points of view, the exclusive therapeutic use of the enantiomer is to be preferred, as to the resolution of the racemate.

Therefore, in the following, the S-enantomer is always meant which as salt is present in the S-( )-configuration and as pure base in the S-(-)-configuration.

Drying in a circulating air drying cabinet (first at ambient temperature and then at 50-60° C.) gives 31.79 g of tartrate (78.23%) of theory).

150 ml of water are taken and subsequently mixed with 39.8 g (0.27 mol) L-( )-tartaric acid and 50 g (0.21 mol) R, S-ketamine.

After the addition of seed crystals obtained in a small preliminary experiment, the whole is allowed to cool to ambient temperature while stirring.

After standing overnight, the crystals formed are filtered off with suction and dried in a circulating air drying cabinet (first at ambient temperature and then at 50-60° C.). [α] O) Thereafter, the crystallisate is recrystallised in a mixture of 1226 ml acetone and 90 ml water.

For this purpose, 10.75 g of the crude base are dissolved in 43 ml cyclohexane at the boiling point.

While stirring, the clear solution is slowly cooled to about 10° C.

##STR2## In the scope of the process according to the present invention, racemic 2-(o-chlorophenyl)-2-methylaminocyclohexanone is reacted in a first step with an enantiorneric form of tartaric acid with the formation of a tartaric acid salt of 2-(o-chlorophenyl)-2-methylaminocyclohexanone.

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