Acidic molecular sieve catalyzed olefin cyclopropanation reaction method
A technology for catalyzing olefin cyclopropane and acidic molecular sieve by molecular sieve is applied in the field of olefin cyclopropanation, which can solve the problems of acid or LewisAcid consumption and inability to recover, and achieve the effect of reducing production cost and high activity
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Embodiment 1
[0017] Embodiment 1: use acidic molecular sieve to catalyze olefin cyclopropanation reaction
[0018] (1) First roast the HZSM-5 molecular sieve at 550°C for 5 hours to remove the adsorbed impurities;
[0019] (2) At -20°C and N 2 Under the atmosphere, add 30mL diethyl zinc solution and 30mL dichloromethane solvent into the three-necked jacketed flask;
[0020] (3) Weigh 0.594g of calcined HZSM-5 molecular sieve, add it into the solution of step (2) under mechanical stirring, then slowly add 15mL of dichloromethane solvent therein, and react for 20min;
[0021] (4) Measure 15 mL of dichloromethane solvent, add 2.470 mL of diiodomethane reagent therein and mix evenly; then add the solution dropwise to the reaction solution of step (3), and react for 20 min;
[0022] (5) Measure 15 mL of dichloromethane solvent, add 2.020 mL of dicyclopentadiene reaction raw material to it, slowly add it dropwise to the reaction solution in step (4), and react at 25° C. for 4 hours;
[0023] ...
Embodiment 2-8
[0029] Embodiment 2-8 reaction steps are the same as embodiment 1, difference is reaction raw material, catalyst or reaction condition, as shown in table 2.
[0030] Table 2 Example 2-8
[0031]
[0032] It can be known from Table 2 that the use of acidic molecular sieves as the catalyst for olefin cyclopropanation reaction has high catalyst activity, high olefin conversion rate and product yield, and the yield of cyclopropane compound is above 85%.
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