Allyl bromide → 2-Allyl-cyclohexane-1,3-dione

反応式

[CH2:1](Br)[CH:2]=[CH2:3].[C:5]1(=O)[CH2:10][CH2:9][CH2:8][CH2:7][C:6]1=[O:11].[OH-:13].[K+].[OH-].[Na+]>C(OCC)(=O)C>[CH2:1]([CH:5]1[C:6](=[O:11])[CH2:7][CH2:8][CH2:9][C:10]1=[O:13])[CH:2]=[CH2:3]

参加物

実験手順

Allyl bromide (195 g., 1.62 mol.) was added over a 15 minute period to a stirred ice-cold mixture of cyclohexanedione (165 g., 1.47 mol.), copper-bronze (4.5 g.), and 330 ml. of 20% by weight aqueous potassium hydroxide. After 6 hours, the reaction was mixed with 1500 ml. of a 5% by weight aqueous sodium hydroxide solution and 1000 ml. of ethyl ether, filtered and the separated water layer acidified with 4N aqueous hydrochloric acid to pH 1. A brown solid (188 g.) formed upon refrigeration at 0° C. The solid was taken up in ethyl acetate and the solution was washed with water (3 × 150 ml.), dried (MgSO4), treated with charcoal, and condensed until turbid. Upon cooling, 126 g. (57%) of 2-allyl-1,3-cyclohexanedione was collected, m.p. 125°-127° C.