2-Chlor-1,1-dimethoxyethan Chemische Eigenschaften,Einsatz,Produktion Methoden
R-Sätze Betriebsanweisung:
R10:Entzündlich.
R22:Gesundheitsschädlich beim Verschlucken.
R52/53:Schädlich für Wasserorganismen, kann in Gewässern längerfristig schädliche Wirkungen haben.
R20/21/22:Gesundheitsschädlich beim Einatmen,Verschlucken und Berührung mit der Haut.
R40:Verdacht auf krebserzeugende Wirkung.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S16:Von Zündquellen fernhalten - Nicht rauchen.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
S23:Gas/Rauch/Dampf/Aerosol nicht einatmen(geeignete Bezeichnung(en) vom Hersteller anzugeben).
Chemische Eigenschaften
CLEAR COLORLESS TO YELLOWISH LIQUID
Verwenden
Chloroacetaldehyde dimethyl acetal can be used as a reactant to synthesize:
- 2-(chloromethyl)-4,7-dethyl-1,3-dioxepane
- 2-(chloromethyl)-5,6-benzo-1,3-dioxepane
- ketene dimethyl acetal
synthetische
Chloroacetaldehyde dimethyl acetal is obtained by the stoichiometric reaction of vinyl acetate and chlorine in the presence of excess methanol. The specific steps are as follows:
186 ml (172 g = 2.0 mol) of vinyl acetate and 142 g (2.0 mol) of chlorine were simultaneously introduced into 324 ml of methanol with stirring and cooling at 0 ° to 2 ° within 1 hour. Then 50 ml of low boilers were distilled off over a 50 cm Vigreux column, then 19.8 g of an intermediate run of a batch which had been carried out in the same way were added, and finally 34 g of calcium oxide were added with stirring and cooling at 40 ° -50 ° C. within 30 minutes. After neutralization was complete, the reaction mixture was in the form of two separate liquid phases. After the layers had been separated off, the upper layer obtained was fractionated, 88 g of the forerunner, which mainly comprised methyl acetate and methanol, 19.8 g of the intermediate run, which mainly contained methanol, chloroacetaldehyde, chloroacetaldehyde mono and dimethylacetal, and the main fraction was 223.1 g of chloroacetaldehyde dimethylacetal ds 89.5% d. Th. Were obtained. If the lower layer formed after the calcium oxide addition is shaken twice with 100 ml of methyl acetate each time and the combined organic phases are distilled, 92.1% of theory. Th. Chloroacetaldehyde dimethyl acetal obtained.
Allgemeine Beschreibung
Chloroacetaldehyde dimethyl acetal is a clear, colorless liquid. It reacts with hydroxythiol to form hydroxy acetal.
läuterung methode
Purify the acetal by fractional distillation. [Melhotra J Indian Chem Soc 36 4405 1959, Beilstein 1 IV 3134.]
2-Chlor-1,1-dimethoxyethan Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
