p-Toluenesulfonic acid → HCID 19801181, compound

Participants

Reaction Steps

8 g of 3-trimethylsilyloxy-7-(2-propenyl)-indene in 25 ml of 1,2-dichloroethane is cooled to 0° C.; 31 g of N-chlorosuccinimide in 80 ml of dichloroethane is introduced over 25 minutes, with agitation for 30 minutes at 0° C.; 0.6 g of N-chlorosuccinimide in 15 ml of dichloroethane and a few mg of paratoluene sulphonic acid are added. After 30 minutes of agitation at 0° C., the reaction mixture is poured over an iced aqueous solution saturated with monopotassium phosphate, with agitation for 16 hours at 20° C. After decanting and extracting with methylene chloride, the extracts are dried, and concentrated to dryness under reduced pressure. The residue is chromatographed on silica, eluting with a hexane-isopropyl ether mixture (7-3). The fractions recovered are concentrated and chromatographed again on silica, eluting with a hexane-isopropyl ether mixture (3-1) and 2.75 g of expected product is isolated.

Provenance & Evidence