3-Methylthiophene → 3-Methylthiophene-2-sulfonyl chloride

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A 49-g (0.5 mol) sample of 3-methylthiophene was added in small portions to a cooled solution (-20° C) of 128 g (1 mol) chlorosulfonic acid in 250 cc chloroform. After the addition was completed, the reaction mixture was allowed to warm to about 25° C and then heated at reflux for 30 minutes. The reaction mixture was then diluted with ice water and neutralized with aqueous sodium bicarbonate solution. The organic layer was separated, dried over magnesium sulfate and evaporated to give 30 g of 3-methyl-2-thienylsulfonyl chloride.

Herkunft & Nachweise