Sodium peroxyborate tetrahydrate → Ethyl 2-sulfo-1-cyclohexene-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

Sodium peroxyborate tetrahydrate (22.3 g) was admixed with acetic acid (120 ml) and heated to 50 to 55° C. and then a solution of ethyl 2-mercapto-1-cyclohexene-1-carboxylate (9.0 g) in acetic acid (15 ml) was added dropwise over 2 hours. The mixture was stirred at 50 to 55° C. for 3 hours and then at 80 to 85° C. for 5 hours and concentrated under reduced pressure. The residue was combined with acetonitrile (200 ml) and stirred at room temperature for 3 hours and the resultant insolubles were filtered off. The insolubles were washed with acetonitrile (50 ml) and the filtrate and the washing were combined and concentrated under reduced pressure, and the resultant residue was dissolved in acetonitrile (150 ml) and stirred at room temperature for 2 hours. The resultant insolubles were filtered off, and the filtrate was concentrated under reduced pressure. The residue was combined with diisopropyl ether (300 ml) and the powder which precipitated was isolated by filtration to obtain ethyl 2-sulfo-1-cyclohexene-1-carboxylate as a white powder (18.8 g) containing inorganic substances.

Provenance & Evidence