Phenol → Ethyl 3,3-dimethylpent-4-enoate
Reaction equation
[CH3:1][C:2]([CH3:6])=[CH:3][CH2:4]O.[C:7]([O-:13])([O-])([O:9][CH2:10][CH3:11])[CH3:8].C1(O)C=CC=CC=1>>[CH3:1][C:2]([CH3:6])([CH:3]=[CH2:4])[CH2:8][C:7]([O:9][CH2:10][CH3:11])=[O:13]Participants
4
Procedure
A mixture of 43 g (0.5 mole) of 3-methyl-2-buten-1-ol, 97 g (0.6 mole) of ethyl orthoacetate, and 7.0 g (0.075 mole) of phenol was heated at 135°-140° with stirring for 9-10 hours. Ethanol was distilled from the mixture as the reaction proceeded. When the evolution of ethanol had ceased, heating was discontinued and the mixture was allowed to cool to room temperature. The mixture was then dissolved in diethyl ether and the ethereal solution was treated with IN hydrochloric acid to decompose unreacted ethyl orthoacetate. The ethereal solution was then washed successively with a saturated aqueous solution of sodium bicarbonate and with water, then dried over magnesium sulfate. The dried solution was concentrated and distilled under reduced pressure to give 60.8 g (78% yield) of ethyl 3,3-dimethyl-4-pentenoate, b.p. 57°-60°/11 mm.