반응 #170952
ord-cd9f2d93171e44769130843b0329e994
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후처리
- 1기타To a 2 L jacket-equipped separable flask
- 2기타provided with a stirrer
- 3기타Prepared gas
- 4workup.ADDITIONdiluted with nitrogen so as
- 5온도While the solution was heated
- 6기타was removed by the Dean-Stark water separator
- 7workup.ADDITIONThus, a reaction solution containing 3-hydroxy-1-adamantyl methacrylate
- 8기타was obtained
- 9기타The obtained reaction solution
- 10세척The resultant solution was washed with 5% by weight of dilute sulfuric acid and with 500 ml of ion exchange water
- 11여과After the washing, precise filtration
- 12여과filter
- 13기타Then, concentration-crystallization
- 14기타was performed by use of an evaporator while the temperature of the solution
- 15기타was kept at 40° C., until the weight of the solution
- 16농축After the concentration
- 17온도cooling
- 18기타crystallization
- 19기타was performed at a temperature of an ice water bath
- 20기타to separate the crystal
- 21여과by filtration
- 22세척The crystal was rinsed with heptane twice
- 23기타dried at a reduced pressure at 35° C. for 24 hours
- 24기타During the process from the dehydration esterification reaction
- 25기타to the solid-liquid separation
- 26세척until the termination of rinsing
실험 절차
To a 2 L jacket-equipped separable flask provided with a stirrer, a thermometer, a Dean-Stark water separator, a Dimroth condenser and a gas blowing tube, 84.0 g of 1,3-adamantanediol, 124.1 g of methacrylic acid, 0.38 g of p-methoxyphenol as a polymerization inhibitor, 1.2 g of concentrated sulfuric acid as an acid catalyst, and 750 ml of toluene as a solvent were put. Prepared gas diluted with nitrogen so as to have an oxygen concentration of about 5% by volume was supplied at a rate of 0.2 L/min. The reaction operation was performed as follows. While the solution was heated and water generated as a secondary product was removed by the Dean-Stark water separator, the reflux state was continued for 5 hours. Thus, a reaction solution containing 3-hydroxy-1-adamantyl methacrylate was obtained. The obtained reaction solution was cooled down to room temperature, and then a 10% by weight of aqueous solution of sodium hydroxide was added while stirring to neutralize the residual methacrylic acid and sulfuric acid. Then, the neutralized water phase was drawn out from the two-phase solution. To the residual organic phase, 0.85 g of p-methoxyphenol was added as a polymerization inhibitor. The resultant solution was washed with 5% by weight of dilute sulfuric acid and with 500 ml of ion exchange water, twice for each. After the washing, precise filtration was performed by use of a Teflon® filter having a pore diameter of 0.1 μm. Then, concentration-crystallization was performed by use of an evaporator while the temperature of the solution was kept at 40° C., until the weight of the solution became 110 g. After the concentration was finished, cooling crystallization was performed at a temperature of an ice water bath to separate the crystal by filtration. The crystal was rinsed with heptane twice, and then dried at a reduced pressure at 35° C. for 24 hours. During the process from the dehydration esterification reaction to the solid-liquid separation and until the termination of rinsing performed by use of ion exchange water, the prepared gas was kept blown into the solution. Table 1 shows the analysis results of the obtained 3-hydroxy-1-adamantyl methacrylate. Methylethylketone was used as the solvent for measuring the turbidity.