反应详情

Under an atmosphere of nitrogen, a solution containing 1.16 g. of cis-2,6,6-trimethyl-1-crotonoyl-1-cyclohexene prepared according to Example 18, 12 ml. of dry benzene and 0.023 g. of p-toluensulfonic acid were stirred 48 hours at room temperature. The solution was diluted with ether, neutralised and washed as usual. The volatile components were removed in vacuo and distillation gave a 90 % yield of trans-2,6,6-trimethyl-1-crotonoyl-1-cyclohexene, b.p. 78°-80°/0.001 Torr, the constants of which were found identical with those of the compound described in Example 12.

1. additionUnder an atmosphere of nitrogen, a solution containing 1.16 g
2. washneutralised and washed as usual
3. customThe volatile components were removed in vacuo and distillation