N,N-dimethylformamide;sulfur trioxide

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: On the contrary, when a tertiary amine such as pyridine is mixed with dimethyl formamide and then chlorosulfonic acid is added to the mixture, dimethyl formamide-sulfur trioxide is formed as well as the case adding the tertiary amine to a mixture of dimethyl formamide and chlorosulfonic acid. When the mixture is used for the reaction of L-ascorbic acid in which the 5- and 6-positions are protected by a ketone or aldehyde the yield of the product is remarkably high and the product in the reaction mixture is crystallized in high degree.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 8.8 g of dimethyl formamide was admixed with 100 ml of dichloroethane and 8.0 g of sulfuric anhydride was added dropwise to the mixture at 15° C to give white needle-like crystals of dimethyl formamidesulfur trioxide complex in stoichometrical amount. was added dropwise to the mixture at 15° C to give white needle-like crystals of dimethyl formamidesulfur trioxide complex in stoichometrical amount