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guolianshun

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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¡æ
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¡æ
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¡æ (10 mm),
1.4163.

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