Catalytic preparation process for aromatic nitrile or heteroaromatic nitrile
A technology for catalytic preparation and heteroaromatic nitrile, which is applied in the directions of cyanide reaction preparation, organic chemistry, formation/introduction of cyano groups, etc., can solve the problems of no industrially applied catalytic method, difficulty in large-scale production, and high technical cost, To achieve the effect of short reaction process, mild reaction conditions and wide substrate range
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Embodiment 1
[0013] In a 100-liter reactor, 25 liters of water, 32.5 kilograms of p-methoxybromobenzene, 14.5 kilograms of potassium ferrocyanide, 2 kilograms of nano-cuprous iodide, 5.7 kilograms of potassium iodide, and 18.7 liters of N,N'-dimethyl iodide were added successively. Ethylenediamine, closed and stirred at 160 ° C for 40 hours, the reaction was terminated, the nano-cuprous iodide was recovered by suction filtration, the organic phase was separated from the filtrate, and the organic phase was subjected to vacuum fractionation to recover N,N'-dimethylethylenediamine amine, and p-methoxybenzonitrile was obtained in 96% yield as a white solid, mp 52-53 °C; 1 H NMR (CDCl 3 ): 3.87 (s, 3H), 6.92-6.99 (m, 2H), 7.57-7.64 (m, 2H); EI-MS m / z : 133 (M+, 100).
Embodiment 2
[0015] In a 100-liter reaction kettle, add 5 liters of water, 30 moles of p-bromobiphenyl, 5.1 moles of potassium ferrocyanide, 1.5 moles of nano-cuprous iodide, 1 kilogram of potassium iodide (6 moles, 0.2 equivalents), 2.64 kilograms of N, N'-Dimethylethylenediamine (30 mol, 1.0 equivalent), the reaction was closed and stirred at 165 ° C for 48 hours, the reaction was terminated, the nano-cuprous iodide was recovered by suction filtration, the organic phase was separated from the filtrate, and the organic phase was subjected to reduced pressure fractionation N,N'-dimethylethylenediamine can be recovered, and the residue is recrystallized from ethanol to obtain p-cyanobiphenyl, yield 70%, white solid, mp 81-82 °C; 1 H NMR (CDCl 3 ): 7.39-7.53 (m, 3H), 7.56-7.62 (m, 2H), 7.66-7.75 (m, 4H); EI-MS m / z : 179 (M + , 100).
Embodiment 3
[0017] 5 liters of water, 30 moles of 4-iodo-4'-ethylbiphenyl, 5.2 moles of potassium ferrocyanide, 3 moles of nano-cuprous iodide, 6 moles of potassium iodide, 24 moles of N,N were successively added to the 100-liter reaction kettle. '-dimethylethylenediamine, the reaction was closed and stirred at 160 ° C for 48 hours, the reaction was terminated, the nano-cuprous iodide was recovered by suction filtration, the organic phase was separated from the filtrate, and the organic phase was subjected to reduced pressure fractionation to recover N,N'-di Methylethylenediamine, the residue was subjected to high vacuum fractionation to obtain liquid crystal intermediate 4-cyano-4'-ethylbiphenyl, yield 90%, mp73~74 ℃, 1 H NMR ( 400 MHz CDCl 3 ): 1.28 (m, 3H), 2.74 (m, 2H), 7.36~7.85 (m, 8H) ppm.
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