反应详情

2.0 Gm. of 2-(5,5-ethylenedioxy-5H-dibenzo[a,d]cyclohepten-2-yl)propionic acid is dissolved in 20 ml. of acetone and to the solution is added 20 ml. of N-hydrochloric acid. The mixture is refluxed for 1 hour, then cooled, diluted with water, and extracted with ethyl acetate. The extract is washed, dried and evaporated to give a 90% yield of 2-(5H-dibenzo[a,d]cyclohepten-5-on-2-yl)propionic acid, m.p. (chloroform-hexane) 138°-139° C.; m.p. (acetone-hexane) 113°-115° C. Use of 2-(5,5-ethylenedioxy-5H-dibenzo[a,d]cyclohepten-2-yl)acetic acid gives a similar yield of 2-(5H-dibenzo[a,d]cyclohepten-5-on-2-yl)acetic acid, m.p. (acetone-hexane) 148°-149.5° C.