Synthesizing process and use of unsaturation cyclic aliphatic carbonate monomer
A technology of cyclic aliphatic and aliphatic carbonates, applied in the direction of organic chemistry, can solve the problems of high cost and complex synthesis process, and achieve the effects of high polymerization activity, high polymerization conversion rate and high reactivity
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Embodiment 1
[0058] Example 1: Synthesis of 2-methyl-2-allyloxycarbonyl-1,3-propanediol
[0059] 9.00 g of 2,2-dimethylolpropionic acid and 4.30 g of potassium hydroxide were dissolved in 50 ml of N,N-dimethylformamide. Stir vigorously for 1 h at 100°C to form potassium salt of 2,2-dimethylolpropionate. Propylene bromide was then added to the above solution, and stirred vigorously for 15 h at 100°C. The solvent was evaporated, the residue was dissolved in 200ml of ether, washed three times with 50ml of distilled water, and finally recrystallized with toluene to obtain 7.9g of 2-methyl-2-allyloxycarbonyl-1,3-propanediol with a yield of 68%. Its structure was confirmed by proton NMR spectroscopy.
Embodiment 2
[0060] Example 2: Synthesis of 2-methyl-2-propargyloxycarbonyl-1,3-propanediol
[0061] 9.00 g of 2,2-dimethylolpropionic acid and 4.30 g of potassium hydroxide were dissolved in 50 ml of N,N-dimethylformamide. Stir vigorously for 1 h at 100°C to form potassium salt of 2,2-dimethylolpropionate. Then propargyl bromide was added to the above solution, and stirred vigorously at 100°C for 15h. The solvent was distilled off, the residue was dissolved in 200 ml of ether, washed three times with 50 ml of distilled water, and finally recrystallized with toluene to obtain 8 g of 2-methyl-2-propargyloxycarbonyl-1,3-propanediol with a yield of 70%. Its structure was confirmed by proton NMR spectroscopy.
Embodiment 3
[0062] Embodiment 3: the synthesis of 2-methyl-2-allyloxycarbonyl trimethylene carbonate (monomer A)
[0063] Dissolve 10 g of 2-methyl-2-allyloxycarbonyl-1,3-propanediol and 28.5 g of ethyl chloroformate in 600 ml of tetrahydrofuran, and cool in an ice-water bath. Then slowly add 28g of triethylamine into the above solution, and keep the system at about 0°C during the addition. Then react at room temperature for 10h. The precipitate was filtered off, the filtrate was concentrated under reduced pressure, and the residue was recrystallized from tetrahydrofuran and diethyl ether to obtain 9.2 g of white crystals with a yield of 80%. Its structure was confirmed by proton NMR spectroscopy, see attached figure 1 .
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