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NTIS 바로가기Chemical & pharmaceutical bulletin, v.57 no.5, 2009년, pp.508 - 510
Niwayama, Satomi (Department of Chemistry and Biochemistry, Texas Tech University) , Cho, Hanjoung (Department of Chemistry and Biochemistry, Texas Tech University)
A practical large-scale synthesis of monomethyl malonate and monoethyl malonate, which are among the most commonly applied half-esters in organic synthesis, is described, applying the highly efficient selective monohydrolysis of symmetric diesters we reported before. The optimal conditions with rega...
1) This work is the subject of U.S. and international patent applications. Niwayama S., U.S. 2009/0023945, WO 2008/150487.
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26) Under comparable conditions on a 0.12 mol-scale with a reaction time of 1 h, we have also obtained the half-esters of dimethyl methyl malonate and diethyl methyl malonate in 90% and 83% yields, respectively.
27) Under the same pressure, 6.55 g (4%) of dimethyl malonate was collected at 45 °C, and 1.31 g (1%) of malonic acid remained after the distillation.
28) Under the same pressure, 5.60 g (4%) of diethyl malonate was collected at 43 °C, and 4.79 g (6%) of malonic acid remained after the distillation.
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