Sulfuric Acid → HCID 20477980, compound

Participants

Reaction Steps

90 g (0.5 mole) of 3,3-dimethyl-2,3-dihydro-4H-1,4-benzothiazine, 500 ml of toluene, 3.2 g of concentrated sulphuric acid and 27.5 g (0.25 mole) of tetrahydrobenzaldehyde are refluxed for 5 hours, washed with water, the organic phase dried and the solvent removed in vacuo. Unreacted 3,3-dimethyl-2,3-dihydro-4H-1,4-benzothiazine is distilled off under a high vacuum, leaving as residue 1-cyclohex-3-enyl-1,1-di-(3,3-dimethyl-2,3-dihydro-4H-1,4-benzothiazin-7-yl)-methane in the form of a dark brown brittle resin.

Provenance & Evidence