Preparation of 4-bromo-2,6-difluorobenzonitrile
A technology of difluorobenzonitrile and difluorobromobenzene is applied in the directions of nitrogen oxide-organic compound reaction preparation, organic chemistry, etc., can solve problems such as high cost, high toxicity, serious environmental pollution, etc. Inexpensive, pollution-reducing effect
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[0041] The present invention will be further described below.
[0042] 1. Preparation of 4-bromo-2,6-difluorobenzaldehyde
[0043] The raw materials used for preparing 4-bromo-2,6-difluorobenzaldehyde are: tetrahydrofuran (technical grade), potassium tert-butoxide, petroleum ether (technical grade), 3,5-difluorobromobenzene (gas chromatography content GC≥ 99%), DMF (i.e. N, N-dimethylformamide), butyllithium (density of 2.4mol / L); the material ratio of the main raw materials should follow: butyllithium / 3,5-difluorobromobenzene =1.2mol / 1mol, DMF / 3,5-difluorobromobenzene=1.6mol / 1mol; the instruments used in the preparation process mainly include: 5-liter low-temperature kettle, -150~100℃ low-temperature thermometer, constant pressure dropping funnel , nitrogen cylinders, water circulation pumps, liquid nitrogen tanks, butyllithium storage tanks, etc.
[0044] The process of preparing 4-bromo-2,6-difluorobenzaldehyde comprises the following steps:
[0045] Step 1 Preparation: ...
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