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guolianshun銅蟲 (著名寫手)
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[求助]
求助翻譯一下200字
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Method B. Compound (I) (i0 g) was added dropwise with stirring to boron trifluoride etherate (8 ml) at a temperature not exceeding 15℃ The diethyl ether was distilled off in vacuum. The resulting complex of (I) with boron trifluoride was treated with phosphorus pentoxide similarly to method A. Compound (II) (5.26 g, 59%) was obtained. Method C. Formic acid (99%; 84 ml) was added at 60~ to the reaction mass obtained by treating (I) (i0 g) and phosphoric anhydride (58 g) in chloroform. After gas evolution had finished, the resulting solution was added to 30% potassium hydroxide solution (300 ml) at a temperature below -5℃ The solid which separated was extracted with chloroform (3 • ]50 ml), and the solution dried over sodium sulfate. The solvent was distilled off in vacuum. The residue was distilled and compound (II) (3.8 g, 43%) was obtained. Propyl ester of ~-isocyanopropionic acid (Ill). This compound was obtained by aknownmethod [12]. Bp 81-82~ (i0 mm), n~ ~ 1.4163: according to literature data bp 81-82℃ (10 mm), 1.4163. |
木蟲 (正式寫手)

金蟲 (小有名氣)
木蟲 (正式寫手)
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方法B:在溫度不超過15℃攪拌下將化合物(I)(10g)滴加到三氟化硼醚化物(8ml),真空下蒸餾除去乙醚。 得到的復(fù)合物(Ⅰ)與三氟化硼用五氧化二磷類似于方法A處理。得到化合物(II)( 5.26g,59%)。 方法C:將甲酸(99%,84ml),在60 ℃下加入到化合物(Ⅰ)(10g)和五氧化二磷(58g)在氯仿中處理得到的反應(yīng)物中,有氣體逸出后反應(yīng)完成。在 -5℃下向所得溶液中加入30%氫氧化鉀溶液(300ml),用氯仿( 3×50ml)萃取分離固體,并將該溶液用硫酸鈉干燥。在真空下蒸餾出溶劑。剩余蒸餾殘余物,得到化合物(II)(3.8g,43%)。 化合物( Ⅲ),通過已知方法得到該化合物[ 12 ]。BP 81-82℃(10mm),N~ ~1.4163:根據(jù)文獻(xiàn)資料沸點(diǎn)81-82℃(10mm),1.4163 |

至尊木蟲 (文壇精英)
Tortoise

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