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With 4-(benzyloxycarbonyl)-2,2,6,6-tetramethylpiperidine-1-oxyl; tetramethlyammonium chloride; In N,N-dimethyl-formamide; at 100℃; for 36.0h; |
General procedure: A 2000 ml four-necked flask was equipped with a Three-one motor and Teflon stirring blades,TMCPP (tris (beta-chloropropyl) phosphate)600 g (1.832 mol),DMF 600 g, as a polymerization inhibitor0.0102 g of BTOX (4-benzoyloxy-2,2,6,6-tetramethylpiperidine-N-oxyl)Sodium methacrylate 14.85 g (0.137 mol)And the mixture was stirred, dipped in an oil bath and heating was started.For prevention of polymerization, the reaction was carried out while supplying air at an amount of 50 ml / h into the kettle. Four hours after the internal temperature reached 100 C.,After 8 hours and 12 hours, 14.85 g (0.137 mol) of sodium methacrylate was added additionally. The total input amount of sodium methacrylate was 59.4 g (0.546 mol). Heating was stopped after 16 hours, after the internal temperature was sufficiently cooled, it was transferred to a 2000 ml separating funnel, 253 g of toluene and 759 g of pure water were added and the liquid separation operation was carried out.After standing for about 10 minutes, the upper layer (aqueous layer) was separated. Subsequently, 749 g of 0.5% aqueous solution of sodium bicarbonate was added to 954 g of the organic layer in the lower layer, and a liquid separation operation was performed. After standing for about 10 minutes, the upper layer (aqueous layer) was separated. Subsequently, 107 g of toluene and 749 g of pure water were charged into 848 g of the organic layer in the lower layer, and a liquid separation operation was performed. After allowing to stand for about 15 minutes, the upper layer (aqueous layer) was separated, sodium sulfate was added to the toluene layer to perform a dehydration operation, toluene was removed using an evaporator and a vacuum pump,585.6 g of a light brown liquid was obtained. As a result of GC analysis,The proportion of the compound of n = 0 in the formula (1) was 76.0%The proportion of the compound with n = 1 was 20.0%The proportion of the compound with n = 2 was 1.3%Compounds with n = 3 were undetected. |