- Method for preparing unsaturated ketone
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The invention discloses a method for preparing unsaturated ketone. According to the method, an unsaturated alcohol and 2-alkoxy propylene are adopted as raw materials, an acid resin in a fixed bed aremodified, a Saucy-Marbet reaction is carried out, and unsaturated ketone is synthesized with high selectivity and high yields. According to the method, the modified acid resin is adopted as a catalyst, the problem that a common acid resin is poor in catalysis effect is solved; in addition, a fixed bed reactor is adopted to catalyze reactions, separation of the catalyst from reaction products before and after reactions can be achieved, equipment corrosion and adverse influence of a great amount of acids upon later industrial aftertreatment can be avoided, and the method is an economic and efficient synthesis method.
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Paragraph 0035-0038; 0047; 0048; 0051; 0052
(2019/04/04)
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- Preparation of unsaturated ketones
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Unsaturated ketones of the formulae Ia and Ib are prepared by a process consisting of the combination of the following reactions:a) The conventional reaction of an allyl alcohol of the formula IIa or a propargyl alcohol of the formula IIb with an isopropenyl ether of the formula III with formation of a ketal of the formula IV as a byproduct,b) preparation of the isopropenyl ether of the formula III by reacting a ketal of the formula IV with propyne or allene, or a mixture thereof in the gas phase at elevated temperatures in the presence of a heterogeneous catalyst containing zinc or cadmium together with silicon or oxygen, andc) feeding the ketal of the formula IV formed in the reaction (a) into stage (b) for the preparation of the isopropenyl ether of the formula III again.
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