تفاعل #94083

معادلة التفاعل

methyl vinyl ketone

hydroquinone

acetic

sodium methylate

→

2,3,6-trimethyl-2-cyclohexen-1-one

4-methyl-3-ethyl-2-cyclohexen-1-one

المذيبات

water

diethyl ketone

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةunder reflux
2. 2
   درجة الحرارةThe whole is then heated for another two hours
3. 3
   درجة الحرارةunder reflux
4. 4
   أخرىThe mixture obtained
5. 5
   ترشيحfiltered
6. 6
   workup.DISTILLATIONExcess diethyl ketone and the water present are distilled off

الإجراء التجريبي

A mixture of 70 g of methyl vinyl ketone, 10 g of water and 0.1 g of hydroquinone is dripped in the course of one hour into a mixture of 400 g of diethyl ketone and 10 g of a 30% by weight methanolic solution of sodium methylate which is boiling under reflux. The whole is then heated for another two hours under reflux. The mixture obtained is neutralized with glacial acetic and then filtered. Excess diethyl ketone and the water present are distilled off and the residue is fractionated in vacuo. 81 g of 2,3,6-trimethyl-2-cyclohexen-1-one having a boiling point of 89° C. at 12 mm Hg and 9 g of 4-methyl-3-ethyl-2-cyclohexen-1-one having a boiling point of 102° C. at 12 mm Hg are obtained. The total yield of cyclohexenone is 65% with reference to methyl vinyl ketone.

المصدر