Synthetic Route of 1731-79-9, In the next few decades, the world population will flourish. As the population grows rapidly and people all over the world use more and more resources, all industries must consider their environmental impact. 1731-79-9, name is Dimethyl dodecanedioate belongs to esters-buliding-blocks compound, it is a common compound, a new synthetic route is introduced below.
Example 8 A condensation solution in an amount of 113.2 g (confirmed by quantitative analysis, after acidification of a part, that the solution contains 25.65 g of the condensation product and 80.84 g of the unreacted ester) prepared from dimethyl 1,12-dodecanedioate (105.00 g, 406.4 mmol), gamma-butyrolactone (8.75 g, 101.6 mmol), and a 28-wt % sodium methoxide in methanol solution (19.60 g, 101.6 mmol) was heated to 50 C. while being stirred. Into the solution, 550 g of n-hexane was added and was stirred while being cooled to 20 C. to form a suspension. The suspension was separated into a precipitate and a supernatant liquid using a pressure filter. The filtration residue was thoroughly washed with n-hexane. The resulting filtration residue in an amount of 35.55 g was poured into 49.8 g (50.8 mmol) of an aqueous 10% phosphoric acid solution. Further, water (350 g) and 1,4-dioxane (250 g) were added, and the mixture was allowed to react for 5 hours at 100 C. The solution was separated into two layers. The organic layer was separated and the aqueous layer was extracted with toluene. The organic layer was mixed with the toluene extract and washed with water, and then the solvent was removed by distillation. As a result, 26.6 g of a crystal product was obtained. After isolation and purification, the crystal product was identified as methyl 15-hydroxy-12-keto-pentadecanoate corresponding to the compound represented by the general formula (7). 1H-NMR (600 MHz, TMS, CDCl3) 1.28 (12H, m, CH2-4~9), 1.57 (2H, tt, J=7.3, 7.2, CH2-10), 1.61 (2H, tt, J=7.3, 7.0, CH2-3), 1.84 (2H, tt, J=6.7, 6.3, CH2-14), 2.30 (2H, t, J=7.5, CH2-2), 2.43 (2H, t, J=7.5, CH2-11), 2.56 (2H, t, J=6.9, CH2-13), 3.65 (2H, t, J=6.1, CH2-15), 3.67 (3H, s, CH3). 13C-NMR (150 MHz, CDCl3) 23.86 (CH2-10), 24.92 (CH2-3), 26.50 (CH2-14), 29.09~29.36 (CH2-4~9), 34.08 (CH2-2), 39.48 (CH2-13), 42.92 (CH2-11), 51.40 (CH3), 62.33 (CH2-OH), 174.30 (C(=O)O), 211.76 (C=O).
In the field of chemistry, the synthetic routes of compounds are constantly being developed and updated. I will also mention this compound in other articles, Dimethyl dodecanedioate, other downstream synthetic routes, hurry up and to see.
Reference:
Patent; Soda Aromatic Co., Ltd.; US6291688; (2001); B1;,
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