NOTES
MAY1966 The infrared spectrum (potassiumbromide disk) showed strong absorption a t 1025 and 1037 em-' (sulfoxide region) and a t 967 cm -l. Cyclization of Propenylcysteine Sulfoxide to Cycloal1iin.-A solution of 120 mg of the amino acid in 80 ml of 1 N ammonium hydroxide was allowed to stand 4 days when it was concentrated in vacuo t,o a crystalline solid. The solid was dissolved in 5 ml of water, 5 ml of 2 N hydrochloric acid was added, and the solution was concentrated in vacuo a t
