O-Xylene → 3,4-Dimethylbenzene-1-carbothioamide
Reaktionsgleichung
[S-:1][C:2]#[N:3].[K+].[CH3:5][C:6]1[CH:7]=[CH:8][CH:9]=[CH:10][C:11]=1[CH3:12].F>>[CH3:5][C:6]1[CH:7]=[C:8]([CH:9]=[CH:10][C:11]=1[CH3:12])[C:2]([NH2:3])=[S:1]Komponenten
4
Versuchsvorschrift
At a temperature as indicated in Example 1, 59 g of potassium thiocyanate (0.6 mol) and 79.5 g of o-xylene (0.75 mol) are stirred with 0.5 l of 98% hydrofluoric acid. and the mixture is then stirred for 10 hours at room temperature. Subsequently, the batch is poured onto ice, the precipitated product is suction-filtered after having been stirred for one-half hour, and the greater part of the non-reacted o-xylene (15 g) is separated from the still moist filter cake by steam distillation. The distillation residue is subsequently suction-filtered and dried. The yield of dimethylthiobenzamide having a melting point of 120° - 125° C is 99 g and therefore quantitative, relative to the potassium thiocyanate used.