Method for preparing cycloheptanone from cyclohexanone through one step

A technology of cycloheptanone and cyclohexanone is applied in the field of preparation of intermediate cycloheptanone, can solve the problems of uneasy handling, long synthesis route and high production cost, and achieves the advantages of industrialized production, simple and convenient production operation and short synthesis route. Effect
CN106380385AInactive Publication Date: 2017-02-08HUNAN KEREY BIOTECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HUNAN KEREY BIOTECH
Publication Date
2017-02-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method for preparing cycloheptanone from cyclohexanone through one step comprises the following steps: using diazomethane as a reagent to prepare a saturated low alcohol solution, adding cyclohexanone and a diluted acid catalyst to a diazomethane alcohol solution, carrying out a slow addition ring expansion reaction at 10-50 DEG C, and carrying out water vapor distillation to prepare crude cycloheptanone; and rectifying the crude cycloheptanone to obtain cycloheptanone. A saturated C4 or less low alcohol solution of diazomethane is prepared through the following steps: reacting hydrochloric acid with a methylamine solution, adding urea, adding a saturated sodium carbonate solution, carrying out a refluxing reaction, adding diluted sulfuric acid, reacting sulfuric acid with a sodium nitrite solution, adding a strong alkali solution to generate a diazomethane gas, introducing the diazomethane gas to a cooled receiving bottle provided with the C4 or less low alcohol. The method has the advantages of short synthetic route, simplicity in operation, environmental protection, high product yield, substantial reduction of the cost, and high facilitation of industrial production.
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Claims

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